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Having trouble with a repair here’s the story. 03 F-150 had a check engine light on with trouble code stating misfire on cylinder 2. Checked all spark plug and determined they needed to be replaced; after replacing them all engine started fine with no trouble codes. Next day truck would not start and had trouble code stating misfire on cylinder three. Check coil and replaced it. Motor ran fine at this time. Next day truck would not start, it would try to roll over it seemed that it was locking up. Removed all spark plugs rotated engine over and fuel gushed from cylinder 2. I pulled the fuel rails off and checked the injectors, seemed like two injectors were not working, cylinder 2 and 7. Replaced all injectors they were rusty and the truck has some miles on it after all were replaced truck ran fine with a little smoke after a while the smoke went away (smoke did not smell like antifreeze). Following day the truck still had the same symptoms pulled the spark plug on cylinder 2 and fuel came out again. Check the voltage at the electrical connector and had proper voltage and good ground. I’m stumped at this point, could ECM be transmitting faulty signal to injector causing it to always turn on filing cylinder with raw fuel or maybe possibly short to ground or power? Just looking for advice on what to tests to perform to find possible fix, and help is appreciated.
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It sounds like your not lighting off what got in #2. Check that spark is present and strong.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
If it’s the 4.2 V6 Hydrolocking was a very common issue with the 97-03 F150’s. Bad intake gaskets that were allegedly fixed in 1998. I think some bad ones might have got through in the 10th generation.
could a blown head gasket cause this symptom? it did smoke heavily but it smelled like raw fuel not burning coolant. The Ford garage in town said the head gaskets are bad, this doesn’t sound like they would be though. I haven’t done a compression check yet.
Lack of compression could cause the dead cylinder, but I would expect it to turn over easier, instead of locking up. Think it would leak the fuel into the exhaust and or oil and coolant.
Also, I think the injectors are switched by the ground, so there should not be a ground present except for a brief moment in the intake stroke.You said you had voltage at the injector. Was this with the engine cranking, or just the key on? Also, have you checked the fuel pressure regulator?
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