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Checking grounds and electrical connections CAN NOT be over stated

BigArt

In for the long haul
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Location
Winnipeg, MB, Canada
Hi all. Been awhile since I posted.

About a month ago my "fishbite" was back. Removed the optical filter (if that's what it's called) totally and fish bite was gone.

BUT the real cruncher came on the way back from the lake, not towing, about 3 weeks ago. The transmission would not hold in OD, and would intermittantly, at 70 MPH, jump from about 2200 to 2800 RPM. When it would hold at about 2200, it would seem the torque converter would intermittantly unlock and RPM would increase to about 2400. TC slipping???? Transmission temp guage was steady at about 160-170. And the cruise control would drop out from time to time.

Got her back home. Checked DTCs and had DTC 47 - Intake Air Temperature Sensor Circuit Low (High Temp ) and DTC 83 - Torque Converter Clutch. I had visions of a transmission overhaul, and I'm not sure where DTC 47 would have come from... Any ideas?

Next day when she was cold, I went over and cleaned every ground (again), and as many other elecrical connections connections as I could get to, including fuses. I crawled up under the track as well, and cleaned there, including 3 big connectors to the transmission. I have to say that none of any of the connections looked bad. Then cleared the codes. There is something to be said about the ease of the OBD1.

Well, it's been 3 weeks and the truck is still running like new again (knock on wood or my hard head). And it didn't cost me a dime :). I hope I didn't jinx myself by telling you all this though :rolleyes5:. I have only code 12 now.

It seems though, as my title says, keeping the electricals clean on these old trucks simply can not be overstated.

I just thought I would share this with all of the fine people here. Have a great summer.

Art
 
Thanks, Art ... great reminder for us all! The PCMs in these trucks control everything, and they like a nice, steady diet of power... solid grounds are the key to that!

Hope your summer is going well, and that you managed to avoid getting flooded out ... take care, huh?
 
Hello Art glad to meet u! I am a newbie and after having apprentised to Buddy, Handcannon, Ace, BJ, and Burning Oil( Leroy) I am imminently qualified in grounds, grounds grounds, gotta check them grounds! Its all about them grounds! By the way I still am thinking about that woodchuck chuckin wood thing. Anyway the fellows feel I am hopeless about ever being a problem solving diesel person, hands are way too clean is the main problem I feel, need more SOOT! Alls good down south here Art u keep er in line up there n I feel the world is a good place here at THE Truck Stop.
 
That story really brought me back down to ground....Thanks Art, May the force be with you.....and all your grounds be shiny, tight and bright!
 
Seems even with no PCM/ECM, Grounds are still a MAJOR preventive maintenance issue that cannot be over looked....

These 6.5's are just electronically sensitive no matter what.
 
Seems even with no PCM/ECM, Grounds are still a MAJOR preventive maintenance issue that cannot be over looked....

These 6.5's are just electronically sensitive no matter what.

X2- Thanks Art, Old-Zimer has started to sett in but dont ask me when!!!
 
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