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PO783 '97 Dakota 3.9L 2wd automatic
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slade25
User
Feb 17, 2011, 6:02 PM
Post #1 of 1
(3154 views)
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PO783 '97 Dakota 3.9L 2wd automatic
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experiencing major stalling issues: have replaced wires,plugs,temp sensor, ign coil, cleaned TB and IAC
I went to transmission shop today, beforehand diagnostic codes PO783 and PO141 came up on my cheapo obd ii. When I go there, the tech put his $10k machine on it and was coming up with nothing on the transmission diagnostic side. On the Engine side of the diagnostic he also came back with the PO783 & PO141.
Kind of surprising but I`m hoping that means the tranny side is okay.
Now here`s where it got very weird. We did a test drive and he left his $10k scanner hooked up as we drove around. The truck was performing worse than the drive over i might add - stalling out and seemingly slipping in gear and performing like crap. Then something i`d never seen before started happening. The Air bag light came on and an audible alarm started to beep (same sound as when the gas guage is low). And then the RPM and Speedometer guages started to flucuate and proceeed to zeroize. This was all while we were test driving. When we got to the parking to the told me he thinks i need a new ECM before i do anything else. He did another scan and was getting communication error. I thought oh noooo 
We popped the hood and he checked the trans fluid, it looked and smelled okay he said. I pushed the 3 connectors from the bus harnass onto the PCM and put my cheapo obd ii on the scanner port and it read the damn codes ! PO783 and PO141 again. I went and got him again, he got his machine out and he got the same...and nothing showing on the transmission side. He still thinks i have a PCM related issue...intermittent or whatever (worst kind actually).
So I drive it home and the damn truck performs like a dream all the way. No stall outs, smooth shifting of the transmission, no coughs, burps, etc.
Talk about a system that is all over the place. I don`t know what to think now, but I`m sure it will act up again tomorrow morning after sitting all night.
btw, this engine has no EGR vlave and we think the catalytic converter is okay.
Sure would appreciate some help with this one.
Steve
Personal info deleted
Please delete the second question from your signature. If you would like to ask a second question, just start another thread with that one.
(This post was edited by Hammer Time on Feb 17, 2011, 6:08 PM)
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