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1986 Honda Civic fouling plug

Tiny
TRAPPEDBKD
  • MEMBER
  • 1986 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 345,000 MILES
For the past few months my car has been running poor. Finally I decided to take it to a shop. Compression was good but #1 cylinder was not firing. So we changed plugs. But it keeps fouling plugs. I decided to check for a trouble code. But no light code has come up on cpu. Im guessing map or 02 sensor. But not sure any ideas?
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Thursday, June 12th, 2008 AT 6:27 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

I would be checking the ignition system on an oscilloscope as this will give you a good overall view of the ignition voltages and firing lines. Have an exhaust analysis done as well if the O2 sensor is faulty it will cause the ECU to dial up a rich mixture, but not normally enough to cause this sort of a problem. Start here,

Mark (mhpautos)
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Thursday, June 12th, 2008 AT 6:30 PM

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