Question about 1990 Honda Civic
Usually that's caused by a vacuum leak near the manifold area.
Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
Hope this helps.
Posted on Mar 02, 2015
Had a few issues with the temperature sensor that caused this type of problem,also check the temperature driving.
Does it heat up to mid gauge or does it stay low or drop when driving.Thermostats sticking open also cause idle issues in Honda range.
Remove the spark plugs and let me know what color the tips are;sooted up or clean.
Is this the EFI injected model or one of the carby models as the above suggestions affect the EFI,but temperature is important to all?
I hope this helps you or get back to me with your findings.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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