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Old 07-04-2012, 05:23 PM   #1 (permalink)
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Question 2003 Chevy Tracker 2.0 with rough idle

Hello everyone! Mom just purchased an 03 Chevrolet Tracker with an automatic trans, 2.0 4 cylinder engine and 90k miles. It has a rough or pronounced vibration at idle. The motor mounts are fine.

The first thing we did was a tune-up: plugs/air filter/oil change. We had a check engine light and the code was for a bad upstream oxygen sensor so we replaced it. The new O2 didn't solve the issue but did get rid of the check engine light. I noticed that the throttle body is a bit dirty and the intake is downright filthy.

I pulled the throttle body and cleaned it. The intake looks like it needs to be removed to clean it properly. Spraying cleaner in there will only cause the sludge to run downhill. Has anyone gone as far as to remove the intake to clean it? Any ideas what caused the oil/dirt or is this pretty common? Should I clean the EGR while i'm at it?

Any suggestions here will be appreciated.
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Old 07-04-2012, 11:01 PM   #2 (permalink)
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By all means clean the EGR, it's going to be gunky, and most importantly, clean the tube that goes from the EGR valve to the intake, it's going to be downright filthy, lots of carbon buildup...
The throttle... All i did was use spray over adn over again, gt ti clean, but that didn't work.

Test your IAC valve, I can get you the resistance numbers tommorrow, but I think your problem is that valve, it's a recurring problem with our vehicles...
You can buy one for a 92 Montero, it's the same valve and way cheaper.
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Old 07-05-2012, 05:54 AM   #3 (permalink)
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And I'd like to add...replace your PCV valve. That is the entry / pathway origination point for the crankcase oil vapors that flow into your intake system. A defective one can cause excessive plenum / throttle body contamination.

I also recommend a can of SeaFoam in the fuel tank every oil change periodicity or so.
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Old 07-05-2012, 06:49 PM   #4 (permalink)
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@ BumpLover: Do you mean your throttle body was repeatedly cleaned but the vibration was still there until you replaced the IAC valve? I pulled the pics for both valves (92 montero and 03 tracker) off of Autozone online and the drive gears don't look the same.

@ Max: I forgot to mention that the PCV valve was replaced at the tune-up. BTW we are from RI and relocated to SC due to the weather. No rust on mom's 9yro suv...a miracle!
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Old 07-05-2012, 08:01 PM   #5 (permalink)
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Quote:
we are from RI and relocated to SC due to the weather
Cool! Did you smuggle in any Linguica to share?

We ended up here from Mass., due to my job! (US Navy)

Decided to stay.
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Old 07-07-2012, 06:47 AM   #6 (permalink)
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Haha...no linguica but plenty of chorizo because my wife is Portuguese.

Bumplover is incorrect about the 1992 Mitsubishi IAC valve. It's different. However, the 1994 - 2001 Mitsu idle air control valve appears to be the same and MUCH cheaper. I hate to approach a repair by throwing parts at the vehicle BUT there is no check engine light. I have never felt a rough idle / vibration at idle like this with no codes thrown. It does run at speed fine though.

Seems also to get lousy gas mileage....22-24mpg. I expected almost 30mpg but may be overly optimistic.
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Old 07-07-2012, 07:10 AM   #7 (permalink)
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Quote:
my wife is Portuguese
Me too!

Your MPG #'s aren't too far off the mark. I get a consistent 23-24 running around the Low Country w/the 2.5 V-6, manual trans, driving conservatively.

Mom should see upper 20's w/the 2.0, depending on her type of driving style and whether stop-n'-go or highway. A/C and the auto trans will hurt those numbers some.

The best I've seen was 25 on a trip, but the inherently high engine RPMs / final drive ratio combo on our vehicles kill any big numbers. That's a proven realization based on the many posts I've seen from other members over the last six years around here.

And once you sort out the offending rough idle / performance issue, that may improve things.
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Old 07-22-2012, 08:27 AM   #8 (permalink)
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Quote:
Originally Posted by MomsTracker View Post
Hello everyone! Mom just purchased an 03 Chevrolet Tracker with an automatic trans, 2.0 4 cylinder engine and 90k miles. It has a rough or pronounced vibration at idle. The motor mounts are fine.

The first thing we did was a tune-up: plugs/air filter/oil change. We had a check engine light and the code was for a bad upstream oxygen sensor so we replaced it. The new O2 didn't solve the issue but did get rid of the check engine light. I noticed that the throttle body is a bit dirty and the intake is downright filthy.

I pulled the throttle body and cleaned it. The intake looks like it needs to be removed to clean it properly. Spraying cleaner in there will only cause the sludge to run downhill. Has anyone gone as far as to remove the intake to clean it? Any ideas what caused the oil/dirt or is this pretty common? Should I clean the EGR while i'm at it?

Any suggestions here will be appreciated.
I own a 2001 Chevy Tracker 2.0 with 64k miles and have owned it since new. Never had a problem except for the same nagging low idle problem beginning over a year ago. Idle at its worse with AC on causing severe roughness at idle and the serpentine belt (new) chirps because of the jerky idle speed. Just yesterday removed the IAC and didn't see any obvious problem with it (over $325 for a new one!). I had this same symptom on what was then a 2 year old '87 Corvette and Chevy recommended cleaning the intake plenum. Idle problem on the Corvette cleared up immediately. Tried this same solution yesterday and noticed an immediate improvement but still not resolved completely. On another forum someone suggested disconnecting the battery to force the electronic control module to relearn the idle mix. Will try that next. If that doesn't work will start working progressively through other components (EGR, PCM, etc) hoping to isolate it.

Mileage has not been affected. It has always delivered 20 - 24 mpg depending on city or highway use. My wife's car and she has a heavy foot and I have a light foot but it doesn't make much difference. Really have to milk it to get more than 24.
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Old 07-22-2012, 08:38 AM   #9 (permalink)
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Cruse. Have you "tuned" it?

Plugs, filters and a can of SeaFoam in the fuel tank for starters.
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'72 Chevy Nova. One owner, SB, A/C, power disc/drum & steering
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Old 07-22-2012, 08:51 AM   #10 (permalink)
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Originally Posted by Max View Post
Cruse. Have you "tuned" it?

Plugs, filters and a can of SeaFoam in the fuel tank for starters.
Plugs changed a couple of years back but have only 8-10,000 miles on them. Filters changed according to recommended maintenance intervals. No sea foam or other additives have been used.
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