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Three codes, hoping someone can help


CMCG

Member
U.S. Military - Active
Joined
Nov 5, 2010
Messages
5
Vehicle Year
2000
Transmission
Automatic
Hey gents, my 2000 4.0 has been acting up, I figured I'd reach out to you guys for help. At first, it would only run rough at start up, for about 30 seconds. Then it started to keep running rough. Next, my check engine light came on. I cleaned the MAF, the throttle body and the air cleaner. My temp gauge hasn't been working, so I threw a new ECT switch in with no luck. I borrowed my buddies OBD 2 comp and received three codes: P0304- misfire at cylinder 4 misfire, P0102- mass air flow circuit low input, and P0122- TP sensor circuit low. Does anyone have any ideas? Maybe new TPS, new MAF, spark plug wire? I haven't had a chance to check the plug wires for resistance, but i'll try and check it out tomorrow. Any insight or help anyone can provide is greatly appreciated.

Chris
 
So I figured I would post my results in case anyone has the same problem. I did a bunch of research and found that I had joined the infamous "#4 cylinder misfire club# due to a lower manifold gasket leak. I found that my coolant was running low and my number 4spark plug was rusty and all the others weren't. I ordered Felpro gaskets, upper, lower and valve covers. Did the job over the last week in the evenings. Went to fire it up last night and it idled like crap. So further searching revealed I forgot to hook up one last vacuum line. Hooked it up and idle was perfect, then the truck started to overheat. Found out I had a massive air bubble, bled that out and now she purrs like a kitten. If anyone has any questions about the job, let me know, it really wasn't that bad.
 

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