ENGINE IDLE REVS UP WHILE IN PARK ON A 2002 SATURN SL2.
WE PURCHASED THE CAR NEW AND IT HAS APPROXIMATELY 94,000 MILES ON IT NOW. IT HAS A 1.9L ENGINE. JUST RECENTLY THE ENGINES IDLE SPEED WOULD SOMETIMES REV UP A BIT WHEN THE TRANSMISSION IS EITHER IN PARK OR NEUTRAL. IT HAS YET TO REV UP SO HIGH THAT I AM AFRAID ENGINE IS GOING TO JUMP THROUGH THE HOOD,BUT I WOULD SURE LIKE TO MAKE THIS REPAIR QUICKLY. IS THERE SOME KIND OF IDLE CONTROL SENSOR THAT I CAN REPLACE. THANKS, JIM from JERSEY
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Famous problem for saturn, yes that bolt (output shaft) has come loose, and it only gets worse-You have to buy a new one, and get one for the input shaft while you are at it-saying that, I'll add some people get away with draining the trans (about 5 quarts) and remove the spin on filter, and refil with 4 quarts of Dextron III and one quart of a trans cleaner/solvent. Then park the car so that the rear of the car is resting against a wall, or telephone pole, something substantial and stationary-Put the car in reverse, and let it idle for 30-40 minutes. It cleans out the valve body (sometimes) enough so that the pressures are high enough to give you back some reverse-it worked for me (99 SL2, 178,000 miles)-You need to drain that mixture out after a short while and put in 5 quarts of Dextron and another filter (trans fluid changes are so easy in a Saturn, like changing engine oil-easy). If you end up doing the bolt fix, you should also do the valve body fix too, that is get a rebuilt one from one of the people who do them all the time-it is a little cottage industry and you can find them on Saturn car forums.
I would check the TPS (throttle position sensor) as that would cause a jump and decrease in idle when sitting in park, or in drive with foot on brake. Im not sure exacly where it is located on your car, but they are usually on the passenger side of the fuel injection system.
my only guess is a vacuum hose leak. possibly a loose air filter housing, or the mass air flow sensor. look for any hoses unplugged. if nothing is noticed, try cleaning out your fuel system. if that doesnt solve it, then it would be something an experienced mechanic would have to come and examine it personally.
this is a problem within your throttle body assembly.your idle control valve is most likely blocked and your throttle body is dirty.if this is not it another popular saturn l series problem is a leak in the intake manifold.
Idle problem most likey a Coolant Temp sensor & connector.Cam covers very common to leak around the sides & down into the spark plug holes.Also all saturn s-series 1.9 engine consume oil.Most 1qt. per 1500 miles some more some less.Service Engine Lamp has nothing to do with regular maintenance.It's a malfunction indicator lamp.If it's on there is Trouble codes stored in the ECM.Auto zone free scan with printout.Hope that helps
the time it takes to use one quart is not the figure I need, how many miles does three weeks represent? 1000 miles per quart is ok, less and you will need new rings in most cases, which of course means an engine overhaul.
Check your motor mounts. I had the same problem and it turned out that the engine cradle (subframe) was rotted out around the drivers side engine mount. I learned that it is a common problem here in New York because of the salt on the roads in the winter.