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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 12-07-2011
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Please help me!!!!!!

Background: 1999 Mazda B3000 Troy Lee Designs 174,000 miles.
Bought the truck in August of 2011 with a cylinder 5 misfire. Replaced the head due to the valve seat being shot. While I was at it I replaced all spark plugs, plug wires, coil pack, iacv, pcv valve, egr valve, egr valve pressure sensor, #5 fuel injector.

Truck has ran fine since august until a week ago. Truck began throwing and idle air overspeed code. Replaced iacv (again), tps sensor, coolant temp sensor, and camshaft position sensor. No more overspeed code.

A couple of days later i get a code for Cyl 5 misfire. Pull the plug and the electrode is all but gone and the plug is caked with carbon and the ground is powdery white. Pulled another plug out of #6 ground was a little white but the electrode was fine. Put a new plug in hole #5. The truck ran fine for two days until today. Got the cyl 5 misfire again. Pulled the plug. The color wasnt bad but the electrode was slightly bent. Any ideas?????
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Old 12-07-2011
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There's something going on in #5 cylinder, and it isn't good. Do a wet and dry compression check on all cylinders to see how #5 compares.
I assume it is the ground electrode that is bent, regardless, something in the cylinder had to hit it: valve, valve seat, piston crown (which is only likely if the piston is destroyed).
Let us know what you find and we will be standing by to help.
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Old 12-07-2011
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Sounds like something is up with a valve or piston(unlikely). Check compression or pull the head again!
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Old 12-07-2011
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the first plug that i pulled was not bent at all. just extremely torched if u will. ill try and post some pics up tomorrow. a buddy has my compression tester.
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Old 12-08-2011
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Could be due to an error in your fuel/air mix in the cylinder.
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Old 12-08-2011
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This site should help you out a bit...
http://www.gnttype.org/techarea/engine/plugs.html
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Old 12-19-2011
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Update. The spark plug electrode was bent when i got the plug. I went to autozone to get a new one and two boxes of motorcraft plugs had bent electrodes. Paid a shop to try and diag the problem. fuel pressure is good, vacuum is good, compression is good. Basically cyl 5 keeps leaning out plugs. They said thst the egr system was causing the misfire. Any suggestions?
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Old 12-19-2011
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If only that cylinder is burning lean, check for a leak in the surrounding head gasket. Also, check the valve seals for that cylinder. Just ideas
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Old 12-19-2011
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Its a fresh cylinder head and i went trough a can of starter fluid looking for leaks
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