November 27, 2011 in 90 - 00 Lexus LS400, I am sharing my experience with this chronic problem of misfire at a certain speed when cruising that I see repeatedly in this forum, First I admit that this forum helped me a lot to find the cause of my problem but unfortunately after spending lot of money in changing many parts, First thing I want to say is that many issues can lead to the same symptoms of hesitation or misfire between 40 to 60 mph, Hesitation at this speed does not mean that the engine is only hesitating at this speed and THIS IS THE TRICK, The misfire is clearly felt at this speed because the torque converter clutch is engaged that means the engine and transmission are considered as 1 unit so any slight misfire in the engine will be felt in the transmission and this is happening only when cruising. I basically have to push pedal 3/4 way down so that it downshifts and accelerates.. Step 1 - Check the ignition coils and spark plugs. Most of the time if the vehicle is running fine it comes on from low brake fluid or a failing wheel speed sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-wheel-speed-sensor). If you can still snap the throttle wide open & the tach responds appropriately, it's not the cats. necessary and make sure pcv valve is good Best bet would be to take it to a local shop to see what they would charge you to replace the plugs. Make sure youre putting the correct octane in the vehicle. I have a 1991 Toyota MR2 with a 2.2 liter engine and 5-speed stick. No redline, just a steady acceleration. The Fix: Replace the air filter. So new spark plugs, battery, oil changes etc. Quick edit: I confirmed the TPS was getting proper power voltage. (This after we changed the fuel filter.). Do you think its a sensor issue? Are there any codes stored? Those cars ran fine as well. If so, I can post the diagnostic procedures from the '92 Repair Manual. 11. What is your rpm at 40 mph on a level road? Asked by ESBJr Jan 05, 2016 at 01:21 PM about the 1996 Saturn S-Series 2 Dr SC2 Coupe. Hesitation on acceleration. a sticky valve . About a month or so ago, the car started hesitating, almost a sharp jerking, when it gets to around 40-50 MPH. For myself I would accept that any heater resistance up to 18 ohms would suffice. When outside air goes into the engine as part of the combustion process, the mass air flow (MAF) sensor measures how much of this air is going in. When the transmission shifts, engine noise usually will quiet down, and the RPMs will drop. He is a graduate of Michigan State University and holds a Bachelor of Arts in advertising. 03-30-2004, 11:11 AM. This started around may 2012 with 99,000 miles on the car. "It is better to be careful a hundred times than to get killed once" - Mark Twain, Where it smokes.. is the current too high! When a car starts jerking as you accelerate it, there is undoubted that it's usually a sign of an impending issue. I have a '96 saturn sl1. I have a Denso 234-4167 Oxygen Sensor that I ending up not needing. Car runs great between 0-40 mph and from about 50 mph on up but the car jerks while eccelerating between about 40 - 50 mph. Can you describe the hesitation in a bit more detail? All 4 are the same sensor its just the cable lengths which are different. my car hasitate at 3000 rpm rpm fluctuate but at 2000 rpm it looks fine. But this too would be noticeable at many speeds. They tried to sell me some other brands but I had them put in AC Delcos. A clogged fuel filter can cause the engine to get too low fuel pressure or cause a clogged fuel injector. And be aware that exposing a perfectly good, even brand new, O2 sensor to our oxygen rich atmosphere while the sensor element remains heated will/might "spoil" the sensor, cause a CEL, for the first 100-200 miles. Can you help diagnose? His has none.yet! I am going they the same issue with my sons 99 Car Hesitates When Accelerating From Stop: 11 Common Reasons In essence, delay or hesitation of the engine during acceleration happens when the engine does not get enough power, and it needs more power to accelerate from a dead stop than when maintaining the speed of a moving vehicle. My car is hesitating / jerking at speed intervals of 20 mph, 30 mph, 35 mph and 40 mph. Hesitation and Stumbling when throttle is applied Ford F-150 2001 105693 miles Accelerator ECU Wiring Jerking/Hesitation Cannot get truck to accelerate smoothly. About a 90 min drive from where I live in Virginia. Will try and let I have spoken to My car stalls when Im getting ready to pull of at a light and when I hit the gas I have hit hard for it to go and I have my fuel pump changed I have transmission leaks they were fix it just started doing it a few minutes and my car knocks while sitting a light and rattles when I take off sometimes, Any answers you described my issue to the T, I was wondering why does my car lose power/jerks and hesitates to accelerate when Im close to the E Ill have 60 miles of fuel left and it starts to act weird. We have a new video every day! lol. Does it happen in any gear? the S series doesn't have a MAF but a MAP Im not sure I understand the question. The ignition wires may be bad. about 6 months ago from a friend of Saturn 4 door stick , 1.9 . It will accelerate past 40, but seems to have trouble. Shaking subsides at around 45 mph. (https://www.yourmechanic.com/services/coolant-is-leaking-inspection) I would recommend having a cooling system pressure test performed on your vehicle by a qualified technician. If so, the answer is no. Thank Heavens for my wonderful mechanic who found and fixed this! 2023 CarGurus, Inc., All Rights Reserved. Sorry, I find it a bit hard to accept that a defective MAIN O2 sensor in an engine with TWO sensors, would result in a lean misfire. Once Im going faster or slower it stops. It did seem to help with the cars overall performance. Let's Jump In! For a better experience, please enable JavaScript in your browser before proceeding. Only to find out that it was my EGR The Fora platform includes forum software by XenForo. what things should i check first? We were told car knocks real loud, and shifts hard to the point it jerks me back real hard. 1D10CRACY 60.2K subscribers Subscribe 3.1K 583K views 5 years ago My 1999 Lincoln Town Car developed. In your shoes, I would delay doing the fluid replacement stuff until after doing the basics and then continue hunting the sputter/bucking problem. Here's an excerpt on the various sensor cross referencing (of part numbers): There are four O2 sensors in the LS430. Have no idea why. It's FREE! Battery Pack Car Jump Starter: http://amzn.to/2nrc6qRAmazon Version of Fuel Pressure Tester: https://amzn.to/2pDXiDsMechanic Monday Official Rules:1. http://www.g6performance.com/forum/showthread.php?t=22038. I've been an auto mechanic for the past 50 years and I'm here to share my knowledge with you.Here's our weekly video schedule:Monday: Tool giveawayTuesday: Auto repair videoWednesday: Viewers car mod show offThursday: Viewer Car Question Video AND Live Car Q\u0026AFriday: Auto repair videoSaturday: Second Live Car Q\u0026ASunday: Viewers car show offSecond Daily Upload Every Afternoon of Live Car Q\u0026A videos as well!Scotty Kilmer is a participant in the Amazon Influencer Program.#savagescotty would it benefit to replace the air induction system with an after market intake, or just go with a standard air filter replacement? It also makes noise when the cars sitting at a light or stop sign. Are you asking if oil on plugs could cause a bad fuel pump? Car hesitating while driving. When this is not working properly, you may also notice a strong smell of fuel. Especially around 45mph. One thing is for sure, you wont be able to drive safely if your engine keeps hesitating while youre on the road. When I took ownership of it, I had the oil changed and it needed an new motor mount and front brakes to pass inspection. fuel pump. x2 on the fuel system. Sounds like something got messed up at the last service, if those problems have only occurred since you were in the shop. Also, you should buy a rebuildable / serviceable fuel filter. don't seem to think the crank/cam sensors could be the culprit. It was just inspected by my local Ford dealership, and everything was running smoothly. I just recently purchased my 00 Focus SE with 96,xxx mi. Send me a private message if you are interested. If press hard it downshift, revs high and pull but it is inacceptable driving style. Its new in box and I'm happy to pass it on for less than I paid for it (I paid $65.00). ALL have result in a CEL but NONE exhibited any physical indication of fault. Im not sure. Yes, it is safe to attach a battery charger to the trunk power lugs. The dealership did mention that since it was need 100,xxx mi. Does the same thing while in gear and while accelerating as it shifts to the next gear it hesitates each time it shifts through all four gears. 2023 We'll see how that goes and move forward. It comes on as I get below 40. My computer for editing / uploading: https://amzn.to/2uUZ3lo7. but the car jerks while eccelerating between ab i have brakes when car is off but when i turn the car on brakes peddle goes to the floor what hell is wrong with it. Your vehicle has two cooling fans, one is for the AC, the other is for the radiator. The winner will be required to give Scotty their full name and mailing address to receive the prize.12. Any offensive, obscene, or lude comments will be ineligible to win the giveaway.8. When it does it, it does it both when I'm accelerating and decelerating. Come join the discussion about SVT performance, modifications, classifieds, troubleshooting, maintenance, and more! If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine wont get the proper amount of fuel it needs for combustion. This can be a chronic problem, or it can only last a few seconds before the transmission works properly again. Also having this issue, wondering after doing everything except a map sensor could the generic TPS be a thing? Flat rate pricing based on labor time and parts, Hand-picked, community-rated professionals, Trusted mechanics, rated by thousands of happy car Still there. The b-body EGR was designed to work with a certain amount of back pressure and has a tendency to fail early when used with a cat-back. Cheap Scan Tool: https://amzn.to/2D8Tvae3. Bill Gate's would stoop to driving an LS? EPB, BMS for Specific Vehicles, Software Lifelong Free Update, NOT Support All Cars $199.00 . Just make sure nothing metallic can touch both lugs at once to avoid a short, and possible fire. Isabella83 my jeep hesitates to accelerate and other times its running great.Took it to get diagnosed and they say nothings wrong. Car engine hesitation is a noticeable problem that can occur as youre driving. This giveaway is in no way sponsored, administered, or associated with YouTube. I have not tried changing the fuel pump or filter yet. The car may be pulling timing for some reason when its hot. It is possible for you to mistakenly think your gears are slipping when in fact it is your engine hesitating. Made with in Silicon Valley. 4k Camera: https://amzn.to/2HkjavH4. 2014 Ford Escape with 88k miles. Amongst that group, all now pushing close too or over 200K, I have encountered numerous instances of O2 failures. My car is a "beater" but now the problem has become a challenge. I will be trying some cleaner in the fuel tank to see if it's the injectors, along with some premium gas. Gotta fix the broken stuff first! Now, I do know that Once the exhaust is supplying HEAT the sensor will provide good outputs. I have done this before and it worked out beautifully. We changed spark plug, fuel filter, transmission fluid, engine oil, engine filter, and clean throttle body, change air flow sensor. similar to what you describe) he didn't even Is there some documentation on changing the spark plugs? 4 inch lift. This may cause a hesitation, loss of power or jerking reaction when this sensor is malfunctioning. Change it out to a clear plastic one temporarily while you're sorting it out to see what kind of crap is coming out of the tank. The fuel filter 's job is to filter the fuel going to the fuel injectors and then enter the engine. Same symptoms as you describe. this issue started when I had about 97000 miles and has gotten worse. Depending on what carb you have, there may be a small screen where the fuel pipe attaches to the carb at the float bowl. 1978 - 1996 Big Bronco - 30-40 mph hesitation - my 93 bronc 351 e4od runs and drives great but a few months ago i noticed that between 30 to 40 mph it sort of hesitates like it doesn't know whether to shift or not does anyone know what this might be? are western hognose snakes legal in the uk risk assessment for cleaning pigeon droppings JavaScript is disabled. Any check engine lights? thats how I fixed mine! If you are using bad fuel which is has been sitting in your tank for too long or is too low of an octane for your engine, it can cause many different problems. 1. The The 2012 Mercedes-Benz ML350 BlueTec is a safe vehicle that offers many standard features such as solid wood accents, thick leather on the seats, and memory buttons to save your seating position. I don't understand why it drove perfectly that one time and I can't recreate it now. By If you aren't going to deal with the tank immediately start carrying around fuel filters to swap out as they clog. guides, Check cars for recalls, common issues & maintenance Mechanics have been little help to this It never stalled and otherwise drove great. CODE P0300,P0302,P0303. 3) Throttle Position sensor can play havoc with the ECU if there is a dead spot on it such the ECU gets an erroneous reading at certain pedal positions. the heater is only used during initial engine start up. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If this is the case, it means something has gone wrong with the car that makes the engine or transmission computer think it needs to run a really conservative calibration to protect the powertrain. Or show off your own car mod on Wednesdays. Lexus # 89465-50140 / Denso OEM # 234-4167 / Denso Universal # 234-4209 / Bosch OEM # 15272 / Bosch Universal # 15733, Bank 2 Sensor 1 - Passenger side (right front) on exhaust header. Have a 1998 manual trans. Indeed, over time, vibrations, the pot fasteners on the automobile chassis can come off.The most common reason for your Mitsubishi Outlander to have a clunking noise/sound coming from under your car is worn brake pads. Starting with cleaning the egr valve. JavaScript is disabled. I have a Denso 234-4167 Oxygen Sensor that I ending up not needing. I always need things like oil, filters, shop rags that I can purchase with the credit. if they carry the part. I don't think it is a transmission issue as the transmission will shift with no affect on the shudder. It did great going down there and throughout the week that we stayed. Entrants that do not comply with YouTubes Community Guidelines will be disqualified: https://www.youtube.com/yt/about/policies/#community-guidelines16.