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Chevrolet Tractor tow vehicle

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IH Man

06-20-2003 07:21:34




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I have a 96' Chev Silverado ext. Cab with a 6.5 turbo diesel. I have encountered a stumble once in a while in acceleration and then I have about a 40% loss of power and the "Service engine" light comes on? What I discovered is, if I purge the fuel bleed off valve of about a pint of fuel, turn engine off, shut valve and then crank back up the problem goes away. This sometimes occurs at various intervals. sometimes won't do it for 600 miles or longer? Anyone got any feedback? Is it moisture in the fuel that the computer is sensing? Strange situation...once I bleed off a little fuel it runs fine. Any of you Chevrolet guys had simular experiences?

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Alton

06-21-2003 20:27:22




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 Re: Chevrolet Tractor tow vehicle in reply to IH Man, 06-20-2003 07:21:34  
Check fuel from lift pump on rail, oil sending unit, and also vaccum pump for enough vaccum which controls wastegate and egr.



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Bob

06-21-2003 10:43:30




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 Re: Chevrolet Tractor tow vehicle in reply to IH Man, 06-20-2003 07:21:34  
There is an electric fuel lift pump in the LH framerail. These fail, or become intermittant, and you have all kinds of weird problems. It is fed power through an oil pressure switch at the upper rear of the engine. These fail also. The electronic fuel injection pump has had it's share of problems, and can cause lots of strange problems. You should pull the trouble codes and see what the computer is actually seeing when it turns on the CHECK ENGINE LIGHT. The fuel lift pump is $140.00 or so, and if it has quite a few miles on it that mught be a good place to start, as problems with these are common.

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RayP(MI)

06-20-2003 17:28:06




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 Re: Chevrolet Tractor tow vehicle in reply to IH Man, 06-20-2003 07:21:34  
On my old (1983) 6.2L diesel, stumbling on acceleration usually means it's time to change out the fuel filter. Mine has a Racor aftermarket unit, so the water sensor on the old GM filter is no longer in service. (No computer either!) Also had to replace the injector pump recently, as it was giving much problems starting, and keeping on running, terrible economy, etc. Hope you don't need to replace the injector pump. Not a pleasant task, and not cheap.

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