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Old 10 Mar 2012, 03:46 pm
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Default Civic starts but doesn't idle?


1996 civic LX non-vtech

Past problems:

fluctuating idle (lurching foward)

smell of gas when refueled (I assume that qualifies as "running rich")

Emissions test failed for P02420 (bad cat)

horrible gas mileage

leaking coolant (history of overheating, no head damage though)

odd physical knocking when car was shut off


I had been driving around all day and drove home to install a spark plug defouler on my 2nd O2 sensor. Unscrew the exhaust manifold/CAT for easy access then decided I didn't have enough sunlight so I reattach it. Primary 02 was disconnected and reconnected in the process.

Go to start the car. It starts up and the the idle dies out after a second or two. Cabin lights and such all work. Gas is 1/2 way mark.

Noticeable post issues:

-4th spark plug has little gas on tubule

-oil is extremely low (but car is at slant)

Suggested problems:

-dirty or faulty IACV

-bad primary 02 sensor

-bad ECU

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Old 10 Mar 2012, 04:01 pm
Join Date: Aug 2008
Posts: 61

If you have gas on spark plug, then probably arcing plug wire or carbon shorting the plug.

Try an inductive timing light to see if spark.

But could also be leaking injector, which a leakdown test with gauge would show.
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