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Old 11-28-2005, 04:59 PM   #1
gongoozler
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Default Idle Adjust

Ok ive searched around and couldnt find anything about adjusting the idle. Im specifically talking about my sisters 97 4eat L. I havnt driven or taken a peak at it, but she says it seems like the idle is low, and when she gets on the gas its like it almost stalls but never does. Pretty noobish for me even to ask this really... but any help is appriciated! Thanks!
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Old 11-28-2005, 05:08 PM   #2
Mulder
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Idle is adjusted by the ECU, if you try and mess with it it will just "fight" you and make things worse.
If the idle is lower than normal, rough, or unstable there may be a problem with the idle controller unit in which case a cleaning may help. Or there could be a vacuum leak or other issue. If that engine has EGR, which I believe it does, the valve could be leaking.
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Old 11-28-2005, 05:26 PM   #3
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Wats EGR? I kinda figured the ECU controlled it since I couldnt find anything. How would I go about cleaning the idle controller unit? Thanks a bunch man!
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Old 11-28-2005, 07:15 PM   #4
Mulder
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EGR is exhaust gas recirculation. It's a valve that allows a controlled amount of exhaust back into the intake to reduce Nox emissions. If the valve fails open or leaks at idle the car will run poorly. I don't know for sure that your engine has one but if it does it's worth a look as a possible source of the problem.
There are threads in the powertrain forums discussing how to remove and clean the idle controllers on the current engines, but the older ones may be different. Still the concept is the same.
I'd suggest that before ripping anything apart that you go through the standard maintenance stuff that can make the engine run lousy if neglected, such as plugs, wires, air and fuel filters. Also look for broken or loose hoses causing vacuum leaks and/or electrical items that are disconnected or damaged (sensors, connectors etc.).
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Old 11-28-2005, 07:44 PM   #5
Hayes
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The first thing I would do is clean the throttle body. Use only a "cleaner for throttle bodies" Often time the throttle plate/valve gets gummed up and does not alow enough air at the idle setting. Clean the body before doing anything else. JMO
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Old 11-29-2005, 02:00 PM   #6
gongoozler
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Well I know she needs a new timing belt and im sure plugs and wires. I went and drove it, and the idle doesnt seem low, but if you hit the gas just right its like a studder before going. Its hard for me to explain it cuz both my wifes and my impreza are manual trannys and ive never driven an auto so I dont really know what im feeling for. Other than that the car seems to be running smooth like a champ.
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Old 12-31-2005, 01:11 AM   #7
projectrally
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Mulder, could an EGR leak cause a P1143 CEL?

P1143 = pressure sensor circuit low input
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Old 12-31-2005, 07:50 AM   #8
Mulder
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Quote:
Originally Posted by projectrally
Mulder, could an EGR leak cause a P1143 CEL?

P1143 = pressure sensor circuit low input
Nope that's a MAP sensor code and not EGR-related.
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