Engine Hesitation At High Rpm There is some hesitation between about 1000 - 2500 RPM. So for what it's worth, some of you may remember that I was saying I had hesitation that felt like timing pull, even on 93 octane during winter months. Average failure mileage is 69,400 miles. 2k RPM and below in this truck outside of 1st gear, and you are a snail. cold 1500rpm warm 1100rpm. Hesitation at High Rpms !!! TPS on a vehicle because it has a hesitation problem, especially a Honda! that's been done to 'tune' the engine so look over that. By James Hamilton and Jennifer Hamilton. How can I fix the sputtering that occurs when accelerating at low rpms? 6 Answers. 2010 Subaru STI High RPM Hesitation Factory 2. The check engine light is an irritation for many drivers, but it gives you essential information about your car and shouldn't be ignored. ScootDawg's Scooter Forum a. Have a 2011 CTS-V with henessy blower. Oil pressure drops when engine is hot and idle. You may have to register before you can post: click the register link above to proceed. Q: I own a 2000 Toyota Camry with only 29,000 miles. If you replace or clean your Mass Air Flow Sensor it might take up to 50 miles of driving for your check engine light to reset and turn off. At anywhere from 1/2 to WOT once I hit ~4k rpm the car starts bucking pretty hard all the way to redline (taking it that far for test purposes). It'll allso shake , or maybe misfire a little bit when at little to no load at these engine speeds, in lower gears. 4 based on 7 Reviews "WOW!! After dyno tune, it's like a whole. Bad low RPM hesitation and high RPM studder it's had a bad hesitation if I step on the gas real hard at or below 2K RPM (almost like the car shuts down completely. High RPM misfiring. I have some hesitation while accelerating at the high rpm end of 2nd and 3rd gear. So the truck was running well, after my major tuneup, and then I power washed the chassis, underbody and engine bay on Saturday. The reverse may cause low end instability, thus an off throttle hesitation. In 2nd gear low rpm does it buck/hesitate or only at high RPM. Closed throttle = vacuum in the cylinder = easy for spark to jump the gap. Ask your builder or tech department at your performance shop about this. If the Yukon engine has high rpm while driving, check the transmission for slippage, that will cause the engine to over rev. I really can only notice it when the overdrive is off and i floor it on the highway. With the engine idling, slowly pull the mixture control out. Upon acceleration to about 3000 rpms it hesitates, but will cruise for a bit at least. This is known as Speed Density (engine speed and density of the air charge). Probably two separate problems, but here they are: 1) The engine hesitates between about 1200-1400 RPM when adding power. Engine bogs down at high rpms?? up to about 10k and felt a little hesitation. Idle speed is an important aspect for transmission engagement. 2k RPM and below in this truck outside of 1st gear, and you are a snail. I run a Solas Concord 15/20 on mine, and it won't break 6,800, but the ski will do 64-65 MPH. CARB ADJUSTMENTS. After that, I was where I was going (grocery store). Seems to be running rich(?) as there is a strong gasoline smell from exhaust. While red-line for the car is indicated at 8,000, the engines easily rev to 9,000rpm. Second step was up-shift a bit late with next tank full. Well, I have been having the same problems that many of us on here are having with an iradic idle, hesitation under load, and sputtering up to like 3000 rpm. Boost = Hesitation Grand Prix Car Forums. For example, on the rollers (dyno), in 5th gear from 2. 2006 Ford Escape XLT 3. Also does it in 4th when rpms are low. motor powered FJ62 1. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration. A wide variety of low rpm generator options are available to you, such as wind power generator, solar generator. that vacuum line will get air and at high speed will be used to enable the. Then you will experience engine hesitation while your RPM is low. ) It doesn't sound like a fuel pump only because it smoothes back out over 3500 RPM. Port was fine. 5K) so the car won’t die right off the bat. Jump to Latest Follow 1 - 20 of 28 Posts The engine basically shuts off until it winds down below. Misfiring under full Throttle, Hesitation in Between Misfiring under full Throttle, Hesitation in Between. motor powered FJ62 1. More pronounced when accelerating up a long gradual incline. So it seems my clutch issue is gone. See our vacuum ports. Three times it decided to let the RPMs climb to 3000, a. The power jet substitutes the main jet size when the engine is revving high. It will hestitate and bog down trying to take off from a standstill. If fuel flow to the carbs is not adequate for sustained higher engine speed, further increase in throttle/rpm/speed may become unachievable. Either way, it should not stop at 7. The 009 distributor is notorious for causing hesitation on acceleration as they don't provide the shot of advance needed for a smooth increase in engine rpm which the vacuum distributors provide. check your maf and make sure its clean. new parts are; cap/rotor wires, plugs, new t/chain & gears, fuel system cleaned. Let me give some background. Second step was up-shift a bit late with next tank full. When I'm accelerating and get to required speed my RPM gauge either drops and steadies or jumps up then steadies back. For multipoint injected engines, the fuel pressure at idle better be much lower than pressure at wide-open throttle. Original code was p0430 bank 2 cat. Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > Engine Tech Forum > 6-Cylinder Tech > 3. once the rotor is removed, remove the dust shield and. Things I tried: added pro circuit slip on, cleaned carb - checked jets and needle (all checked out), checked spark, added new plug, checked the fuel mixture screw and made sure it had 3. If the bike doesn't pull well at high rpm. ( Direct ignition is used on this engine to significantly reduce this effect, but it still happens). Wiki User 08/04/2008. It is especially noticeable in sport mode when in first gear before it changes to second. Engine experiences a brief hiccup at 2,000 RPM in 5th (less obvious in 4th) gear. More than good-looking, Pony Carburetor's atomizers are high on function and improved performance because Jon wouldn't have it any other way. Please login or watch this Engine Tuning 101 series to get more familiar with engine calibration:. With clutch in RPM drops to zero, but engine restarts after a couple seconds using. An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. Tuning tips for your E85 carburetor (crazy long) General. Had a quick search, but didn't turn up exactly what I was looking for. is usually the culprit for a high speed miss on a warm engine. It'll allso shake , or maybe misfire a little bit when at little to no load at these engine speeds, in lower gears. The result was bad steering problems, hesitation off the line and a severe knocking problem. I've got your basic fuel injected '05 Rode Glide with a high flow air cleaned / Reinheart slipons, V&H Fuel Pak. Every time the engine RPM passes ca. 259570) has worked well for several years. " This would be mixture leaning out, or the spark becoming intermittent. Engine Hesitates, Stumbles, Lacks Normal Power The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture, and when extra fuel is needed if the throttle suddenly opens wide. The main fuel pump. It is so hard to try and cyber diagnose. USUAL CAUSE The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. There are lots of online resources, do a google search. BMW X3 hesitation on acceleration The salesman said it was due to the cold and a cold engine. Narrowing down the cause of engine bog and dead spots in the rpm range - Hot Rod Magazine. If I baby the accelerator she'll run well at high RPM. The rev range over which the hesitation / fluttering / jerking / stuttering occurs will depend on exactly how worn the EGR VSV is. It has fouled out three sets of spark plugs (iridium) I have tried everything I know how so far I have:. As the title suggests I've very recently been having some engine hesitation, and jerkiness, most noticeable around the 2-3000 RPM mark. Lose power for 1/2 second, pull hard for ~700 rpm, lose power, pull hard, head on steering wheel, head on head rest, repeat to 6000 rpm. After I start engine, oil pressure guage indicates about middle of guage whether it's idle or running. 500 rpm without any problems and overboosts to 1. When the idle mixture is correct, the rpm will rise slightly to between 25 and 50 rpm. She starts up cold real nice. I've had this problem for the last 6 months, and I cannot figure it out for the life of me. On a cold start the engine spikes a high rpm like it normally does and then comes back down and everything seems fine. I have read the threads on this subject thoroughly but I still need some help and suggestions as to how to correct this problem. I'm not looking to be the coolest kid in high school, nothing about my car. Throttle position values on the EVIC are always steady and not varying, though. The cracked Frame. Seems to be running rich(?) as there is a strong gasoline smell from exhaust. But after about 10mins of that, it went away. The issue 2. Is Low RPM Hesitation Normal? These engines need mid to high rpms just like an inline 4 engine. Page 2-240 Loss of power uphill and high RPM maintenance & nonperformance Hesitation when I fully depress the gas pedal on any type of ground. So the truck was running well, after my major tuneup, and then I power washed the chassis, underbody and engine bay on Saturday. At IDLE, there should not be any more than 7. Eventually I got good at feeling it start to think about doing it, and just changed my shift points. soak in high altitude area Hesitation at 3000-4000 rpm during acceleration None. Position the application throttle control to fast then back it off approximately 3/16" (4. Located on the drivers side of the engine toward the rear. Engine hesitation, almost by definition, usually goes back to a misfire in one or more of the cylinders. The RPM range of the camshaft and intake should match or be very close. When i hold it at rmp, around 4500-4800 the engine hesitates and makes a "Popping" sound. If you run a high compression engine, you need high Octane to avoid detonation. I picked up a used 06 DRZ a few months ago and did a few mods including a JD rejet. If the bike pulls harder at high rpm when cold and less hard when fully warmed up, the main jet is too large. Insufficient burning inside the engine will make the car hesitates or jerks when driving. The result was bad steering problems, hesitation off the line and a severe knocking problem. Suite B, Rohnert Park, California 94928 - Rated 4. There is a difference between a hesitation (bog) or a starving engine (engine falling flat at a certain RPM). This is a general guide which will list symptoms for 944 starting and running problems and common causes of those problems. If I put her in reverse and start backing up the engine RPM will drop and she'll almost stall. This could happen during acceleration, driving downhill. A throttle tip-in stumble at engine speeds of 1,300 to 2,100 rpm. Conclusion: This information is aimed at allowing tuners to understand what happens when cam timing is altered. In some designs, valve lift can also be varied according to engine speed. Most O2 sensors are sensitive enough to pick up a single misfire in an individual cylinder at low rpm. rpms will not hold. The operating cylinders are therefore run at a high brake-mean-effective pressure (BMEP) and therefore potentially more efficiently. It felt almost like it was bouncing off the rev limiter; but it wasn't. 0 in/hg of vacuum, a 6. I shifted into a higher gear and was cruising at about 65 mph and noticed severe. 90 ELPTO 2 Stroke Hesitating, dying at high rpm. I'm working on a friends 2000 Camaro SS. We had it looked at - They replaced the carb. Does anyone know what could be the cause of my hesitation and rough idle issues?. 259570) has worked well for several years. This does not occur always, but about 99% of the time. 0 in/hg of vacuum, a 6. Fuel filter recently changed. Bigger hesitation now when. Once the engine warms up, the problems start! On a warm engine, the car idles really rough. I’m experiencing hesitation while accelerating between 2800 and 3800 RPM. 500 rpm without any problems and overboosts to 1. This problem surfaces as hesitation at low RPM. When i hold it at rmp, around 4500-4800 the engine hesitates and makes a "Popping" sound. It started to sputter and could barely get up to 5000. now the fuel pressure is spot on according to the manual. Circa, 2001. Identifying a lean misfire caused by dirty injectors takes a more experienced eye. Dropped RPMs around 3000 and they would hold. around 5500 rpm at full throttle it bogs in and out like crazy. The symptom you describe at high RPM. Then it spits and hesitates sometimes dying. The issue occurs most generally due the air/fuel mixture is going lean or isn't being enriched properly. It not only can become worse but it's unsafe. After I start engine, oil pressure guage indicates about middle of guage whether it's idle or running. Timing was set at 10-12 BTDC. Just wanted to share my happiness after finding the reason for my engine sputtering problem. It is not very noticeable under 5000, but once RPMS climb, the misses become more apparent. I've recently changed the timing belt, ecu temp sensor, sparkplugs (ngk bkr6e-11 had bkr5e-XX before), spark plug wires, oil and the airfilter. You can drive it down the road to test, and it will. drops to 2300 rpms and comes back up to 2400. The hesitation eventually got so bad that the car will barely pull past 5000rpm, getting from 5000rpm to 6500 rpm even in a low gear takes forever. We have the classic issues with our Rav4 D4D that many on here seem to have- very hard to start when warm/hot, (unless left for about 5 minutes) and hesitation at about 3250 RPM, until about 4000 RPM when the power kicks back in again. Moreover, all these benefits come without any drawback. If the car starts when cold but, idles rough or does not want to stay running, this can indicate a problem with the engine. Lack of engine power. The cure was 1st full tank with double dose of system D, about 50km after departing home when engine is fully warmed up, take a gradient with engine in low gear and at high RPM, gradually reaching the RPM. I've just completed the rebuild of my engine and am noticing some hesitation/sputtering when driving. You might also l. It's idling a little higher now (1000-1100 rpm), where it used to be at 800-900 rpm before. Thanks for this thread. Hesitation Under High RPM/Engine Load 07-14-2016 10:44 AM #1. Original code was p0430 bank 2 cat. If it is not detonating, I am not so sure it is to much timing. When she got home I took it out and quite easily replicated it. Almost feels like it wants to stall. After the adjust I noticed the idle was running high. After that I couldn't get it started at all. Sent from my iPhone using Tapatalk. #1: Hesitation at low rpm ??? (solved) Author: vira-go, Posted: Thu Jun 03, 2010 5:47 am I just bought the bike a couple of months ago, 1994 XV750. Re: high rpm hesitationneed help Well, I think Jeff Chambers is on to something here the more I think about it, I think your carb is not enough to push that engine. i red the some forums about the problem and they said it might be the sparkplug connectors are broken, and the other says it might be my steering fluid after i put a steering fluid to it. The 2008 Mazda MAZDA3 has 3 problems reported for engine hesitates. How is the tune-up on her? I know you take good care of the car, but it could also be sparkplug gap, dirty cap or old wires and heavy humidity is affecting it at higher rpm (spark scatter, electricity passes the shortest distances between two points thing). If the fuel injector is spraying too much fuel into the engine cylinder, this will create a surge in the engine causing your acceleration to be much slower. You can do this by shutting off the engine, putting on some old clothes and gloves, and making sure nothing is dangling from your body that could get caught in a part of a cooling fan that suddenly decides to start running, even thought the engine is off. The main fuel pump. so that was changed out. Now the car will not drive above 2000 RPM and will not drive up a hill. A wide variety of low rpm generator options are available to you, such as wind power generator, solar generator. Hesitation/bog at 3000 rpmno longer able to pass on freeway. For a given main jet, a larger air correction jet will reduce fuel flow in the higher RPM range. Probably two separate problems, but here they are: 1) The engine hesitates between about 1200-1400 RPM when adding power. The 1300-2200 rpm range is the transition spectrum that designates when the engine is switching from the low rpm "lean" mode to the power-developing mode. When your engine starts and stalls, it is often due to standard maintenance problems. Now keep in mind that Opel/Vauxhall Engine that was in that car requires a removal of the intake manifold in order to get to rear 3 plugs. Fuel filter recently changed. The GM High Feature engine (also known as the HFV6, and including the 3600 LY7 and derivative LP1) is a family of modern General Motors DOHC V6 engines. If set too high, when shifting from neutral to drive or reverse, the engagement will be too abrupt, causing not only driver discomfort, but also affecting the components of the transmission as well. 7 V8 engine 5 speed. I let her warm up a little, then drive. Lt1 hesitates when at high RPM? 1 2 3. 29 Idle Air Control Valve. As I said, my engine made the exact same "stumble" around 4200rpm. At around 3200 RPM, the stbd engine started faltering, RPM's would vary from3200 to 3000. when I rev up the engine, it stops at around 3000 RPM, and stumbles, I haven't tried to hard to go past 3000, I just know it doesn't like to go any higher, the engine is new, and heads rebuilt about 4000 miles ago, fuel pump and filter is new, as are spark plugs and wires, and O2 sensors, im starting to wonder if this could be an ECU issue or something more serious. If your Buell Motorcycle is experiencing problems and you could use some friendly advice to help diagnose/troubleshoot the issue, please first review the extensive listings of issues already documented below; if none match your particular Buell troubleshooting issue, then please initiate a new thread here and post a thorough description of your particular Buell Motorcycle problem. What causes the hesitation or pulsating at high rpm’s? , I am putting a Hemi 6. Honda S2000 High speed hesitation due to failed MAP sensor - 6 reports. rpms will not hold. If I put her in reverse and start backing up the engine RPM will drop and she'll almost stall. A while ago I had a small vacuum leak which was in the line going to the vacuum canister. 0L DOHC - starts and idles fine. With the engine idling at normal operating is caused by oscillating cam timing, diagnostic temperature CHT above 93 °C (200 °F) apply. As well the car shakes when it is idling. so that was changed out. 1989 325ix Off Idle Engine Hesitation - Video Included When I drove the car it was fine until about 4k rpm where it would then just fall on its face until the. The GM High Feature engine (also known as the HFV6, and including the 3600 LY7 and derivative LP1) is a family of modern General Motors DOHC V6 engines. The ignition wires in the Miata should be replaced every 50,000 miles or sooner if you begin to develop a low RPM hesitation or misfiring. but I noticed the hesitation again. Keep in mind. It has fouled out three sets of spark plugs (iridium) I have tried everything I know how so far I have:. If I press the gas pedal when motor starts to hesitate the RPM's will increase, transmission changes gears and the hesitation immediately goes away. It hesitates when u put ur foot in it, at 2nd + gear, and it just falls FLAT on its face!. It's a 2013 with 2. You start the engine cold and it will hardly run. check your maf and make sure its clean. When I'm just cruising around with my boy in 2nd or 3rd gear it runs fine but as soon as I hit the street and try to get on it I get the bog. More pronounced when accelerating up a long gradual incline. Its also chucking out alot of black smoke, any ideas what this could be guys. My engine is set at the middle position, with the float raised. First, you should know that there are two types of timing in an engine: cam timing and ignition timing. Unfortunately, the 351C 4V heads are not a good choice for a low RPM truck engine. Have a 2011 CTS-V with henessy blower. It sounds like the Main is too small. Initially, when I got it on the road for the first time after the rebuild, it had a Holly 4160 600 cfm. For a given main jet, a larger air correction jet will reduce fuel flow in the higher RPM range. At higher speeds and high rpm the system is advanced by default as fuel gets dumped into the engine. Re: engine stays at high revs when shifting / not in gear Sounds normal to me, every engines different with how long it likes to hang at the higher rpms though. You can do this by shutting off the engine, putting on some old clothes and gloves, and making sure nothing is dangling from your body that could get caught in a part of a cooling fan that suddenly decides to start running, even thought the engine is off. SYMPTOM SUMMARY The engine idles too high. Rpms drop if pull oil dipstick. So I shifted into third and rode it out to redline and again, same feeling of hesitation. Hesitation with HIF6 carb on A+ engine I have a '62 Sprite Mark II. The tach will drop straight down to 0 then flutter in the middle, and then return to the correct RPM. I tried taking off vacuum advance, and plugging it and no difference. ive asked around, some people said my turbos bad but idk. In 1st through 3rd gear, when I'm cruising low rpms (<2500) the car seems to hesitate when I roll slowly into the throttle. Lets simplify matters and assume a carburetor with nothing more than an idle circuit and main circuit. Closed throttle = vacuum in the cylinder = easy for spark to jump the gap. RPM limiter is 7200ish. Dropped RPMs around 3000 and they would hold. 5k, sometimes 6k). It's idling a little higher now (1000-1100 rpm), where it used to be at 800-900 rpm before. This is where engine is producing most power but the mixture setting will cause the engine to run too hot and overheat. Moreover, all these benefits come without any drawback. Re: high rpm hesitationneed help Well, I think Jeff Chambers is on to something here the more I think about it, I think your carb is not enough to push that engine. The MAP sensor reading is factored in with engine RPM to calculate volumetric efficiency. However on 3 occasions today the engine has hesitated when moving off - it is almost like the accelerator is being pressed/released repeatedly until it hits 3000 rpm and it then pulls smoothly. At less throttle it is less violent, but still happens. It has fouled out three sets of spark plugs (iridium) I have tried everything I know how so far I have:. The Mack PowerLeash™ engine brake provides more braking horsepower through mid-RPM ranges, and weighs 50 pounds less than competitive engine brakes. Problem is, applying full throttle the engine misfires/hesitates like hell over 5. In some cases it will slip between gears, so you start off OK but then when it would normally shift up to 2nd or 3rd the engine races for a few seconds before the transmission catches. I checked transmission fluid levels last week. See our vacuum ports. I have a 2003 grand marquis with 90,000 miles, when I am maintaining a speed I feel a jerking sensation. If I hold it steady around 1,600 to 2,200 RPM's it will start to hesitate and buck a bit. " The engine speed changes dramatically repeatedly below 2200 RPM It will jump from 800 to 1500 down to 1200 up to 1800 and so on. In higher gears it almost always bogs down at high rpm. You certainly can't go by the factory specs when your engine isn't all bone stock and isn't running all factory components, especially when running an aftermarket distributor, or even a stock replacement distributor. Hesitation at full throttle (not necessarily high RPM) can be due to excessive plug gap (worn plugs - plugs open gap as they age due to metal transfer) or a small gap inside the plug wire. TFSI hesitation/missfires at high rpm's. So check those parts and systems described in this post for the common causes to help you fix the problem faster. You describe the problem as shudder. Once the engine warms up, the problems start! On a warm engine, the car idles really rough. After a high idle of several. I am convinced that this jerky transmission and high RPMs is the. With better braking over the entire speed range, PowerLeash delivers the most braking ever in a Mack engine brake. Which I did, most of the issue reduced. 8 is the same engine fitted with different camshafts, and this engine can be found in the Fiesta RS1800i. This must be done first - before moving on to the other tuning ranges. Its possible that I associated the high rpm hesitation I currently have with the clutch slipping issues I had before the RST. Large(ish) brass job. Exterior Features; Bodyside/Cab Step or Running Board: Option; Bumper Step Up: Standard; Front Air Dam: Standard; Metallic Paint: Standard; Power Sliding Side Van Door: N/A; Power. If the Yukon engine has high rpm while driving, check the transmission for slippage, that will cause the engine to over rev. For very small leaks I believe it is possible for the car to adapt to the extra air entering over time and increase the fuel delivery on idle, thus leading to a high idle. I have played with jets in the carb as I originally thought was a lean condition on the secondaries. Start the car and adjust the idle stop until you get it to idle between 800-900 RPM With the air cleaner on, adjust the mixture screws until the RPM drops 50 (don't use a vacuum gauge). The Causes of Internal Engine Knock, and How to Eliminate it. But I still changed tires to a bigger size 185/65 R14 this gives me about an 8% reduction in RPM for same speed. The correction for each of these problems is a complete, systematic, diagnostic approach using the manufacturer's recommended procedures and specifications. (odd , i thought about it and wondered. This does not occur always, but about 99% of the time. The bike idles wonderfully (about 1,200 rpm), and accelerates pretty smoothly. It is scary if you are not used to it (the hesitation, that is). Timing was set at 10-12 BTDC. It is a 60° 24-valve design with aluminum block and heads and Sequential multi-port fuel injection. The Novak Guide to the GM 4L80E Automatic Transmission Introduction. Below 2800 RPM the car accelerates smoothly; likewise above 3800 RPM. One, when I am running 1500 rpm at 17-19 tps cruising at around 35mph. ) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more. I am convinced that this jerky transmission and high RPMs is the. "engine hesitation" at high rpm. 3500 Rpm then the hesitation starts up through 4500 Rpm then it is like I have an engine on. Insufficient burning inside the engine will make the car hesitates or jerks when driving. That will help the seals, bearings, and everything. It ran great until a few weeks ago. It runs rough and idles very low and will even quit a few times. At less throttle it is less violent, but still happens. Road tested & verified concern. Which I did, most of the issue reduced. This could happen during acceleration, driving downhill. There is a difference between a hesitation (bog) or a starving engine (engine falling flat at a certain RPM). I have experience with the Performer 350 vs. Did you used a good brand of spark plug wires? Not long ago I bought a set of "duralast" plug wires (had to learn the bad way, i know) and the results were catastrophic, the Overdrive wouldn't kick in and the MPG were very low. Almost like the car needs to think if it should accelerate or not for like maybe 2-3 seconds and then suddenly really pulls. but I noticed the hesitation again. Noticed a slight loss of high rpms the weekend before the low end bog appeared. A hesitation at high RPM, if it's not an ignition problem, can be a lack of fuel. vacuum was around 16 Hg. Specially designed intake and exhaust manifolds. the RPM drops like the engine will stall. sulfur smell is a sign of a clogged catalytic converter. When one or more cylinders stops firing, the power cuts, and the vehicle hesitates under acceleration.