Misfire, Intermittent, 89 S10 Blazer
#1
Misfire, Intermittent, 89 S10 Blazer
I have an 89 S10 with 4.3 "Z" engine. It misfires at random times and craps out at times. Once cool again, it behaves for a while. The rotor, dist cap, coil and coil wire were done 7,200 miles ago. The plugs and wires about 17,000. I have a new sender and gas tank. It runs great when not having this problem. My mech wants to start with new plugs & wires as well as the dist cap, coil, etc. DOES ANYONE KNOW OF ANY OTHER THINGS TO CHECK ON THIS TYPE OF VEHICLE AS WELL? Thank you very much.
#2
Have you checked out the Fuel Filter?
#3
What is the humidity like during this? If it is more humid out when it is misfiring, then I would agree, a general tune up (plugs, wires, cap, & rotor) would eliminate the ignition system. You can test the coil and I would definitely recommend doing so before just replacing it.
#4
Solved
It looks like the EGR failed. There was also a build up of water in the distributor. The spark plug gap was @ 100 vs. the 60 spec. He replaced the dist cap, dist rotor and the plugs. Runs fine again. Thank you.
#5
The fuel filter was replaced when I did the gas tank. A pin hole in the lines back there had to be done so I did a new tank. There was a lot of rust back there. Thanks
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