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psd runs on 4cylinders

2K views 10 replies 8 participants last post by  hobbs310 
#1 ·
i have a 97 psd that runs really ruff i tryed 2 scan it no codes came up so i tryed to narrow the problem down ran the truck with the valve covers off and unplugged each injector and listend 4 a changein the engine and afterunpluggin all 4 on the drivers side with no change i began unpluging injectors on the passenger side and the first one i unplugedman a difrence u think its the ICM injector control module thnk
 
#4 ·
might be or a bad wire harness under the cover

question, if the engine is running with out valve covers, isnt the oil flowing out?

not really. they only oil flow is what is coming out of the push rods to lubricate the rockers etc... and at idle it doesn't spray out.

or if you touch the injector wiring, dont you get shocked?

A trick I was told was to always stay touching something plastic... That is what we did and did not have any problems :thumb:
comments above.
 
#3 · (Edited)
We just had this exact same problem on my buddies 97. It was his IDM. I would take the idm off the drivers side fender and check to make sure it doesn't have water in it. His had leaked water in and destroyed the IDM...

his would not read any codes either. We did a buzz test and they all buzzed, but it cam back saying 2,4,6 low side something or other...
 
#10 ·
does it ever starighten out and run fine?

Mine was losing the passengers side bank on start up with ck engine light and then would fire on all 8 like nothing was wrong and the light went out.

Ended up the connectors were all burnt up going into the VC and once i got the VC off the harness was all burned up.

What did the under cover harness look like?
 
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