As I apply pressure to my gas pedal nothing happens right away and then all of a sudden the car lunges forward as if I goosed the pedal. It only acts up at take off. When hauling a trailer it seems that there is enough weight behind me to offset the lunging forward. I had the software replaced with little to no improvement.
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Re: Gas pedal slow to respond
Let me base this one on personal experience.
i had the exact the issue with a Lynx Ghia m/t after cleaning some parts under the hood. at first i thought it has something to do with the engine itself, compressing gas and blowing it like crazy, then i took it to a mechanic. to my surprise, i extended the clutch so even if i dont do clutch the car is in clutch, then when it slips, the car lunges forward.
just want to share it, you may check that out too, consult the owners manual on proper settings.
you can treat this one a solution or not thats okay, i just want to share my experience.
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Does the engine light come on during this failure? If it does, please have the codes read and forward them back to me. From your symptoms, it sounds like a mechanical failure. I would inspect the TAC (throttle actuating control) valve. and the throttle pedal, to start? You can look at it physically, inspect the wiring, condition, and operation. If you can get a friend to help. remove the air inlet tube, look at the butterfly inside the TAC unit. Have your friend turn the ignition key to run (DO NOT START THE ENGINE) and watch the butterfly respond as he or she applies and releases the throttle pedal(request to your helper, to communicate how far the pedal is going down and coming back). The motion of the pedal and the butterfly should be smooth and consistent. Would you tell me how often these symptoms occur and does it happen when the engine is cold, hot, or any temperature. Write back with any additional information or questions, good luck.
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump for instance) in the form of a fault code
in its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE
DIAGNOSIS & TESTING IS COMPLETED.
Check the vacuum line on the fuel pressure regulator for any sign of gas being sucked into the line. A failed regulator will let extra gas get into the engine. If it's okay, have the fuel pressure checked. That's sure a lot of gas, way too much for the engine. Good luck.
Try this: Go to your local parts store and purchase a can of (throttle body cleaner) you will take your air filter out and remove the big tubing that is connected to your throttle body and filter housing. Spray the cleaner inside the throttle body, open the (butterfly) and spray around the pivot the butterfly opens and close on. What happens is you get carbon build up in these areas and it causes the gas pedal to feel like it's stuck and have to apply more pressure to the pedal. You will see alot of black carbon run out of the throttle body. Take a clean rag and wipe down the area of the throotle body. Repeat the cleaning 1-2 times. put your air inlet tubing back on and re-install your filter. It may seem hard to start at first but it's drying out the cleaner that was sprayed inside the body. Try this and see if this works. I've done this on many vehicles that shops want to charge $300 to do and all you need is $5 cleaner. It's very easy to do and takes 20 min.
sounds like one of the metal arms connected to the engine may be getting stuck some how. have someone get in car and press on gas when car is off while you watch engine to see what is moving, then check those arms to see if there is any possible obstructions or knicks or something on them