1989 Dodge Daytona SPARK PLUG MISFIRE

JDODGE89

MEMBER
1989 DODGE DAYTONA
4 CYL
2WD
AUTOMATIC
110,000 MILES

I HAVE JUST REPLACED THE PRESSURE RELIEF VALVE DUE TO IT BUSTING -. WHEN I GO THIS DONE I NOTICED A MISFIRE. I DISCONNECTED THE PLUG WIRES 1 AT A TIME & WHEN I GOT TO THE LAST ONE, IT STOPPED. I HAVE REPLACED THE PLUG AND IT STILL DOES THE SAME THING. WHAT ELSE SHOULD I BE LOOKING AT THAT MAY BE CAUSING THIS PROBLEM?

1 Reply

CH112063

MECHANIC
1,320 POSTS

I hope you mean when I got to the last cylinder there was no difference, it still had a misfire, maybe that injector wire is not connected or working for that cylinder or there is a compression problem with that cylinder. If 4 cylinders are not working evenly and it gets worse as you pull the plug than that cylinder is not the problem, if one just runs the same whether its has a plug wire or not then that cylinder is the problem cylinder. Spark, injector(single point injection) compression in that cylinder or a bad vacuum leak at that cylinder will cause a partial or total loss of power in that cylinder.