6.5L no boost - Diesel Bombers

Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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Old 01-08-2013, 02:03 PM
Diesel Fan
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Join Date: May 2012
Location: Wisconsin
Posts: 11
Default 6.5L no boost

I have a 95 6.5, with no boost. I used to be able to hear the turbo when I would step on it in the cab and hear the wastegate open. Now I have no boost and I was wondering what could be wrong. I put a new vaccum pump on and I still dont have anything. Could it be the wastegate or the boost switch? Also going down the road from 2000rpm to 2600rpm and I hold it there on cruise it throws a code and if i accelerate or slow down the code goes away. Any information would be greatly appreciated.
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Old 01-08-2013, 06:35 PM
acesneights1's Avatar
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Join Date: May 2011
Posts: 134

Pull the codes. Should be 78 IIRC. Probably got a bad sol but check the wires going to it first. Also check all the vac lines.
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Old 01-08-2013, 08:10 PM
Join Date: Jan 2013
Location: Haliberton
Posts: 2

I have had the same thing happen too me it was the acc on the drivers side rocker cover.
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