Accord Vehicle Info:
1990 EX manual
Symptom:
When engine is totally cold (sitting for hours) and you started it up, idle would fluctuate up and down for a good few minutes or more until it warmed up completely, then everything would be fine. Never had any issues with the engine not starting, just an annoying issue.
Cause:
Fast idle thermo valve (FITV) loosed up over time.
Price:
Free, did it myself. I adjusted the FITV by removing the top cover, turning the slotted ring to tighten it down all the way (clock-wise direction) while FITV is hot from putting it in boiling water. Resealed the cover and reinstalled the two screws. I used a impact driver to remove the screws because they were stuck on there pretty good. I let the car sit the rest of the day with hood open, to cool it back down faster. I checked back by starting the car later in the night and I started it 3 times and it functioned normally now.
1990 EX manual
Symptom:
When engine is totally cold (sitting for hours) and you started it up, idle would fluctuate up and down for a good few minutes or more until it warmed up completely, then everything would be fine. Never had any issues with the engine not starting, just an annoying issue.
Cause:
Fast idle thermo valve (FITV) loosed up over time.
Price:
Free, did it myself. I adjusted the FITV by removing the top cover, turning the slotted ring to tighten it down all the way (clock-wise direction) while FITV is hot from putting it in boiling water. Resealed the cover and reinstalled the two screws. I used a impact driver to remove the screws because they were stuck on there pretty good. I let the car sit the rest of the day with hood open, to cool it back down faster. I checked back by starting the car later in the night and I started it 3 times and it functioned normally now.
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