1998 Isuzu Trooper eratic idle

Tiny
RMSBEAN
  • MEMBER
  • 1998 ISUZU TROOPER
Engine Performance problem
1998 Isuzu Trooper 6 cyl Four Wheel Drive Automatic

1998 Isuzu Trooper: Check light came on, codes read both o2 Sensors I changed them light is still on. My symptoms are when cold all is well after a ride, turn off and when started again while hot, idle is erratic, up down sometimes stalls. When I put in drive forward, or backward it idles normally and acts just fine? The symptom will not return until I turn off the ignition and then soon after while still hot start the car again. If I let the car cool down let’s say in 1 hour it will start and run perfectly, it also runs perfectly until I begin the turn off ignition and while hot start the process again. I did some research on IAC valve, this seems to be my best bet, please give me your thoughts. I can’t find any vacuum leaks.
Regards, Richard
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Saturday, May 17th, 2008 AT 4:48 PM

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Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi rmsbean,

After replacement of the sensors you need to erase the codes. Try it and see if it works as the memorised code might be giving the ECU a false reading during start up.
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Sunday, June 1st, 2008 AT 1:08 AM

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