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  #1  
Old 09-08-2006
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cylinder 4 misfire

Changed plug wires, plugs, coil, fuel injector cleaner and still no luck. No white smoke so hopefully no head gasket problems. Anywhere else I may have missed?
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Old 09-08-2006
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What kind of vehicle? Engine fuel and ignition systems vary. Need more info I think, though someone might be able to help you without it.
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Old 09-08-2006
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1999 2.5l
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Old 09-08-2006
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Get a spark tester from a auto store and check if you get anything, and also while you are at the store pick up a cylinder compression tester and test all the cylinders, they should all be about the same.
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Old 09-08-2006
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How do you test the cylinders? All the plugs are arcing, as a matter of fact the back two arc all the time, like to the harness.
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Old 09-08-2006
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You mean the plug wires are arcing all the time to the other wires? That ain't right if so.

Did your problem start before or after you made all these changes -- in other words, did you have the problem after replacing these things, or did you replace these things and then had the problem.

Fuel injector cleaner won't fix certain injector problems. If it's not ignition, the next most likely thing is a fouled injector, I would think.
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Old 09-08-2006
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I noticed it bogging down and it sounded like the muffler was blown. Then it threw the code, then I changed the wires et al. Its only the two on the back, when I pull them off the coil it arcs back to the harness.
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Old 09-09-2006
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Anyone? I am thinking about changing both the coils and maybe the injector tomorrow.
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Old 09-09-2006
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I've been dealing with the same thing. Here's what i did:

I ohm tested the coil pack per the Haynes manual and it checked out.

Swapped the #4 sparkplug with another cylinder. Code came back so it wasn't plugs.

Swapped the plug wire completely with another plug wire. The code came back so it wasn't the plugs.

I put fuel injector cleaner with the gas and the code continued to come back.

I swapped alternators with another one laying around and the code went away for good.

I swapped the alt cause I was getting a bad chirp from under the hood and thought this was the culprit. I didn't think it was related to the missfires. It might be that the battery being unhooked for 30 minutes reset all the sensors? I don''t know. But the problem is gone.
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Old 09-09-2006
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I dont see how the alternator could be related to the misfire but it might be worth a shot.
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Old 09-09-2006
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What was the engine code? Did you have a timing light? hook it to the wire and make sure they are all sparking normal.....

Rocky
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Old 09-10-2006
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P0304
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  #13  
Old 09-10-2006
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sorry i cant help, but i have always loved your classy truck.
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Old 09-10-2006
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Quote:
Originally Posted by skankinandy
I dont see how the alternator could be related to the misfire but it might be worth a shot.

me neither. I think the battery geting unplugged may have been a factor. I don't know. I'm just glad it's gone. I was clearing the codes everytime I tried something new.
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Old 09-10-2006
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Ok, I dont see any problems. I have checked all the sensors and cables and everything now. After comp reset it acts fine for about 3 or so mon under load then it will bog down but still run ok. Just kinda sounds like the muffler is full of water.
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  #16  
Old 09-11-2006
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Changed the injector tonite and its still there, not quite as bad but still there.
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Old 09-16-2006
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Anyone?
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  #18  
Old 10-02-2006
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Quote:
Originally Posted by graniteguy
I've been dealing with the same thing. Here's what i did:

I ohm tested the coil pack per the Haynes manual and it checked out.

Swapped the #4 sparkplug with another cylinder. Code came back so it wasn't plugs.

Swapped the plug wire completely with another plug wire. The code came back so it wasn't the plugs.

I put fuel injector cleaner with the gas and the code continued to come back.

I swapped alternators with another one laying around and the code went away for good.

I swapped the alt cause I was getting a bad chirp from under the hood and thought this was the culprit. I didn't think it was related to the missfires. It might be that the battery being unhooked for 30 minutes reset all the sensors? I don''t know. But the problem is gone.

It could be that the alternator isnt charging enough and making the computer not read correctly.
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  #19  
Old 11-26-2007
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I am having the same problem. Did you ever find out what the problem was? I have a Cyl 2 misfire code. I have replaced plugs, wires, coil, ran fuel injector cleaner, even replaced the TPS as that was another code I had at the same time. My truck runs like absolute crap at idle and stalls out sometimes when its cold. It runs so-so at any kind of throttle input.

Any Ideas???

Please Help I am stuck.
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  #20  
Old 12-05-2007
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Bueller??? Bueller????
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  #21  
Old 10-15-2015
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2.3l and 4.0l #4 cylinder misfire

Camshaft synchronizer assembly is the issue. Monitor the knock sensor for verification. Replacing the CSA will fix the issue.
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