1993 Honda Civic Idel Spped Varies

1993 HONDA CIVIC
180,000 MILES • 4 CYL • 2WD • MANUAL
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RNEHLS1
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  • 1 POST
I have a 1993 Honda Civic with a 1.5. I jusrt replaced the motor after it overheated and started to smoke. After replacing the motor, I keep getting a rolling Idel. I have replaced one of the Idel control sensors and cleaned the other. I also got a used MAp sensor as well. I can not seem to get it to stop. I have checked all vaccum lines and it hold 8psi.
However when I sprayed carb cleaner on the the 4 piston intake area it started to pop. So I replaced the PCV thinking it may be taking in a little cleaner into the area.
Mar 22, 2008 at 4:39 PM
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BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
A leaky vac system is a cause but it can range from EGR valve, low coolant in the system (antifreeze), air in the cooling system, and a number of other things. I might suspect the intake manifold as cracked or a bad intake manifold gasket. A simple smoke test will tell if there is an intake issue.
Mar 25, 2008 at 1:28 AM
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