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2000 Mazda Protege Mazda Protege misfire

Tiny
KPPROTEGE
  • MEMBER
  • 2000 MAZDA PROTEGE
  • 4 CYL
  • FWD
  • MANUAL
  • 120,000 MILES
I get misfire on 1 cylinder, recently #2. Started 2 years ago. Replaced plugs, problem solved, for awhile. Replaced coils, problem solved, for a whole year. Code 302 returned. Replaced cables, not fixed. Replaced plugs, problem solved, for a week. Checked plugs, wiggled cables, problem solved.

In other words, there is a misfire on a single cylinder. Problem never goes away by itself. Problem can be solved, for a while, by removing and reinstalling plugs, cables, coils.

Thoughts: The problem started some time after timing belt was replaced. Probably not related.
Could there be an intermittent bad connection on the low voltage side of the ignition? Need to investigate, but not sure how since it's intermittent.

I'm tired of throwing parts at this. Any thoughts.
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Monday, November 2nd, 2009 AT 7:34 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi kpprotege and TY for the donation

Misfire at cyl no. 2 do a compression and leakdown test on no.2 and also check and test the injector on it-

Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Tuesday, November 3rd, 2009 AT 12:27 PM

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