Question about 1999 Saturn SL

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99 saturn revs high rpm drop slow rough idle in gear with ac on almost a miss

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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.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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1 Answer

Car engine idles really high then really low, why?


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

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http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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These details will help.

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1 Answer

My 2009 camry has started idling rough only when ac on. You can feel it really bad when braking, stopping, letting off the brake to go or slowing down. It only happens when ac is on. What could this be?


When the AC is switched on, the engine has to rev up by few hundred RPM to take up the additional load of the compressor.
So the fuel pump will change settings to supply the extra power for the engine.
Hence it is important that you get the engine tuned up as the idiling speed must be adjusted and then the idling while AC come ON.
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1 Answer

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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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Dec 16, 2009 | Hyundai Motor 2002 Elantra

1 Answer

I have a 2002 Saturn SL also. I bought it


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Oct 02, 2009 | 2002 Saturn Sl

1 Answer

1997 chevy truck rpm slow to return to idle


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1 Answer

High revs


being a fuel injected engine , there are many reasons this could be happening.
from the top , lets check the Manifold Absolute Pressure (M.A.P.) sensor , as it is easiest.
Find the MAP sensor , it has a couple a wires and a vacuum tube going to it and is on the firewall or fender support under the bonnet.
Disconnect the wire harness from it (small plug with wires).
If the engines RPMs drop to normal , replace the MAP sensor.

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