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Anonymous Posted on Jul 13, 2012

91 saturn no acceleration, rpms reving and dropping drastically, runs rough

Very slow acceleration, at stops engine revs to 3000 rpm then instantly drops to almost stall idle. sounds like engine is misfiring and ver dim headlights

2 Related Answers

Anonymous

  • 6 Answers
  • Posted on Mar 30, 2010

SOURCE: Saturn SL2 does not idle, revs, misses.... Did before I removed

My car was doing this pretty bad and I changed the engine coolant temp sensor and it fixed my problem. Hope this helps!!

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Steve Allison

  • 5569 Answers
  • Posted on Sep 02, 2010

SOURCE: 99 saturn revs high rpm drop slow rough idle in

Put the car in the darkest environment you can and with the engine at idle, look around the high voltage leads; plug wires, etc. I replaced my lousy leads after about 2 years.
If you have a multimeter, you may be able to isolate one or more bad leads by measuring their resistance. It should be ~7-10Kohms, mine were nearly open (infinite) on two.

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Mitsubishi triton mn

it may require a ECM upgrade in the software
in the mean time restrict the rpms between gear changes
for example accelerate in first ti around 3000 rpms and slow down the selection and keep the rest of the changes around the 2500-3000 rpm range
naturally , the harder yo rev it the longer it will take for the rpms to drop
just as a point of interest how did you get a brand new car that is 4 years old ?
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Acceleration won't go past 3000 PRM at idle

The car does have a maf, but it is rarely the cause of rough idle. Rough idle is usually caused by vacuum leak, pvc issues, or idle air control valve. What does it do, specifically, and is the engine light on?
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My1991 mazda 626 will not rev up over 3000 rpm

DO YOU MEAN WHEN YOU ARE ACCELERATING? Or do you mean sitting and reving the engine? If you are just reving the engine in park then the rev limiter is kicking in.
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Check engine light on. Will not rev up over 2500 rpm. Fluctuates between 2000 and 2500 rpm and runs rough. Upon first start, you can rev fine and it runs smooth as long as you hold the rpms over 3000. ...

Hi, there are a lot of things that could cause this behavior, so it would help us to diagnose your problem if you could get a scan of the OBD2 connector and send us the trouble code. If you live in the US you can usually get a free scan at your local parts chain.
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Problems accelerating

the engine tickover is too slow when the engine is cold its running on cold start, ie:choke,, after it warms up the engine slows down this is what is causing it to stall in gear,, get some one to hold the brakes hard on and with the engine running in gear ajust the tick over till its reving at 750 - 850 rpm the revs will go up a bit when its out of gear,, before you pick a gear to go into push the foot brake down to stop the car lurching,,,
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Vw polo maintains engine revs when foot is off the accelerator.

You need to check the cable the runs from the gas pedal to the engine, it might be rusty and need some drops of penetrating oil at the point it meets with the engine accelerator valve.
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