Misfire issue
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Misfire issue
Alright so I’m having a misfire in cylinder 8. I have new plugs, I’ve swapped coils, I’ve replaced the fuel pump and checked no. 27 fuse. All good so far. I’ve done a manual compression test and it’s good. I’ve done a relative compression test and it failed. I also had 2 other codes. Bank 2 rich and bank 4 weak I believe it is. I don’t remember. This was a few weeks ago. (Bought a 94 Toyota pickup 4wd and rebuilt the motor in it to be my everyday driver) but I can’t seem to figure out what’s causing the issue. And ideas?
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Joined: Jan 2008
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From: Maine, Virginia
Welcome!
I had a misfire in my '04 Expedition that was so slight and so random that it wouldn't throw a code. I ended up replacing all eight coils to solve the issue. You easily could have switched one weak coil for another. Did you carefully inspect the pigtail that attaches to the coil?
I had a misfire in my '04 Expedition that was so slight and so random that it wouldn't throw a code. I ended up replacing all eight coils to solve the issue. You easily could have switched one weak coil for another. Did you carefully inspect the pigtail that attaches to the coil?
Fleet Owner
Joined: Apr 2008
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New plugs can be bad. I'd start by swapping the spark plug and fuel injector with another cylinder to see if the problem moves.
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