Another misfire problem!!!!!
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Joined: Jan 2010
Posts: 15
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i think im have a similar problem, i have 97 5.4 it started missing on the #6 so i changed the COP and plug just like the others. well 10 or so miles down the road it came back and strted missing again. so went and got another COP and plug installed and again 10-15 miles latter missing again still sasme cylender.im lost im going to take it to the shop if i cant get it figured. any ideas. i checked compression, its good i dont know what to look for behind the timeing cover? i looked the wire harness over and see no brakes or frays sign or rubbing. so whats next. thank guys.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
i think im have a similar problem, i have 97 5.4 it started missing on the #6 so i changed the COP and plug just like the others. well 10 or so miles down the road it came back and strted missing again. so went and got another COP and plug installed and again 10-15 miles latter missing again still sasme cylender.im lost im going to take it to the shop if i cant get it figured. any ideas. i checked compression, its good i dont know what to look for behind the timeing cover? i looked the wire harness over and see no brakes or frays sign or rubbing. so whats next. thank guys.
Yea, try swapping injectors as-well. If the monitor is catching the misfire each time, you should be able to pin point the problem fairly easily. The 10 or 15 miles then miss tells me it's a coil or the plug and everything else is fine, that's a clasic reboot bad coil/plug scenario.
Last edited by jbrew; Feb 15, 2010 at 01:16 AM.