Question about 2001 Saturn SL

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RUFF RUNNING CAR/ IDLES RUFF

MY SATURN SL idles smooth with AC ON
idles ruff with AC OFF

Replaced both CO2 sensors, new spark plugs and wires, air filter, oil and filter

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Use carb cleaner spray on the inside of the throttle body.

use super unlead only to prevent buidup.

cold engine only.

hope this helps
thank you
jm

Posted on Jul 25, 2009

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Posted on Jan 02, 2017

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The regulator is on top of the engine along the gas line. It has a vacuum line on top. Start the truck and pull the vacuum line off the regulator. If fuel comes out of the regulator, it has failed. You can run pretty rich with a busted regulator-especially at idle.

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MY CAR IDLES VERY HIGH, THEN LOW, THEN HIGH AND ROUGHLY.WHERE IS THE IDLE ADJUSTMENT LOCATED?


There is no idle adjustment. The idle is computer controlled. It does sound like you have a vacuum leak. The most common problem for this is a bad intake gasket. When it is running ruff spray a little carb spray around the area where the intake bolts to the head. If the engine smooths out you found your problem.

Please be careful when doing this. Carb spray is flammable!

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sounds like spark plugs or spark plug cables are bad and it is in fact misfiring this happened to me in my car and my spark plug cables were bad

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Car shakes at stop signs, very poor gas mileage, and sputters whe


Try having your fuel injector cleaned, you can start with running fuel injector cleaner though your gas tank and if that does not help then you have to get it cleaned out professionally or even worst have the injector's replaced if they are bad.
The other thing that will give it bad fuel would be a bad air intake temperature sensor go bad, as for the ruff idle that is common to a dirty or stuck EGR valve.
Good luck and keep me posted, by the way, what kind of Garage did you take it too? And are there and DTC codes from the ECM?

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Hi you should change the coolant temp sensor this is a white sensor on top of the intake and is part ot the computer system.

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