Question about 1998 GMC Jimmy

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Car has no power when accelerating, and now won't accelerate over 25-30mph. When accelerator is "floored" power drops out, but RPMs go up. Check Engine light is on and flashes on occasion.

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Check the catalitic convertor, sounds as if it is clogging up

Posted on Nov 11, 2010

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Why does engine run rich at times under acceleration?


not enough detail
to get an engine to accelerate , the air /fuel mixture is moved to rich in accordance with engine rpms
the more rpms the richer until the peak rpms are reached
( accelerator pump-power valve in carbies and ECM settings according to accelerator position
black exhaust smoke in diesels
so if you press the accelerator slowly then the air/fuel mixture is altered constantly in relation to the pedal setting
If you floor the pedal then it moves to rich and you get black exhaust smoke until the air mixture is again in balance

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1 Answer

Why altima will not accelerate. HELP!!!


my gmc jimmy has that problem in the winter i have to floor it to just move so it tackes a minute to actually move and once im in second gear its fine so just try that

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I have a 1996 Cavalier convertible, 4cyl, 2.2 it ran fine when i store it last year but now it won't accelerate. You floor the gas pedal and it takes the car 5 minutes to get to 35mph. At this point...


OLD GAS THE NEW GAS THEY HAVE DOESNT LAST MORE THAN 2MONTHS BEFORE IT SEPARATES. YOU PROBABLY HAVE A BAD FUEL PUMP OR ONE THATS ON ITS WAY OUT

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91 eagle talon problem


sounds like the high speed jet in the caburator is fouling,, service the carburator using a kit deigned for your car,,, the kit contains all the replacement parts for the carb..

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My 97 Outback has a miss at idle, at upper RPMs it seems to fire on all cylinders. The CEL is flashing. Today when I was driving it lost power on acceleration, limping along. The car never died. Once I...


If the light is flashing it means the engine has a misfire that can damage your catalytic convertor which is very expensive. A tuneup might be in order if its never been done, but I have personally seen many bad timing belts and fuel pumps that have gone bad on those vehicles also.

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1 Answer

2005 chrysler 300c. The pedal is to the floor


if it is an automatic ( speed sensor mentioned ) check the gear linkage selector /cable for proper adjustment as it may not be selecting correctly into drive

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