Question about 2001 Saturn S-Series
I have a 2001 Saturn SL1. It's been a great car as far as, it's stayed working... but there has been a problem with it for a couple years now that seems to be getting worse... or maybe it's a different problem all together?!
At first, whenever I would come to a stop (for example, at a stop light) and the vehicle started idling, it would idle slightly above 1000 rpm, but then it would slowly drop down below 1000 until it hit around 500 and then it'd "sputter" and jump back up over 1000 and then continue this process. I took it to 2 separate mechanics and they both said that it looked like a vacuum leak but they couldn't find one after searching all over.
One of the mechanics did more looking into it than the other. He found that all the spark plugs had proper compression and were getting proper sparks. But he said that one of the spark plugs (can't remember which one now...) was not actually igniting anything. It wasn't getting fuel I guess. So he replaced the corresponding fuel injector. Nothing changed.
I then looked up online at some Saturn forum that my year/make/model car had a common problem that they were shipped out of the manufacturer with a fold in the intake manifold gasket and that it caused that problem around the same amount of miles that I had. So I bought one of them and had him replace it. Nothing.
Well... that went on for a while, but for the last year what it's been doing is idling high (2000-3000) and so I haven't had to worry about the previous problem... just the really high idles! On top of that, it "burns" oil. I check my oil every 500-1500 miles and it's needing a quart added to it. It's also really black.
Replaced the PCV valve and that did nothing. It was cheap and I could do it on my own, so I said what the heck.
I would probably just replace it except that it's paid for and it gets really great gas mileage (38 mpg in my city!).
Any help would be GREATLY appreciated!
I just went through the same ordeal with my 2002 Saturn SC-1. I don't know if your SL1 has a 1.9 Litre engine, but if it does then maybe my ordeal will help you.
My SC1 was getting great mileage until it started idling above 2,000 RPM. I'm curious if you are still getting 38 mpg because my gas mileage went down the toilet!
Initially I thought my problem was electrical, so I changed all the plug wires and changed out no 1/4 coil because my code reader said I was getting a misfire on No. 1 and 4 cylinder. That didn't change so I replaced the the Ignition Module, still high idle. Then I replaced the Idle Air Control Valve; still no change. Next I pulled off all the fuel injectors and sent them to Witchhunt to have them cleaned. Still no change. Still idling at 2,000 to 3,000 RPM. I happened to read on the Saturn Forum Website that if an Intake Manifold Gasket is faulty, just spray some brake cleaner on the backside of the motor and if it stumbles, there's your problem. If you've eliminated all the possible variables than that had to be the problem. I changed the gasket and it runs great! I'm back to 38-40 MPG and I idle at 700 RPM. I would try the Brake Cleaner on the backside of the engine and see if it stumbles. If it still does, then your mechanic didn't do a good job or you can easter egg like I did!
How many miles do you have on this engine, and when is the last time you changed your oil? You might want to add some Rislone to your oil and that will get rid of some of the carbon build up after your next oil change.
Posted on Aug 12, 2008
Replace coolant sensor and thermostat together..The original thermostat has a rubber seal that fails...The temp switch also has been known to fail....Engine will run lower in temp...PCM thinks car is cold...Will increase Idle....
Posted on Feb 12, 2010
Replace the temperature coolant sensor. about $10.00
Posted on Feb 11, 2009
Rpms race up then no power it has to cool then it will go again please help
Posted on Jan 15, 2009
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Posted on Jan 02, 2017
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