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1997 6.5 TD - no acceleration

Jetfrank

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Hi folks, I've been lurking on here for knowledge so this is my first post. '97 GMC Sierra, used infrequently and parked in the Fall and everything was fine. Started it a couple of weeks ago and basically all I have is a smooth idle but will not go beyond around 1000 rpm when you hit the accelerator. Basically idle slows and it starts piston slapping or dieseling. Does not seem to be getting 'fuel? perusing the threads I see a lot of problems can be traced to the PDM or the lift pump - replaced both and no change at all - idles smoothly but when you press on accelerator pedal same thing happens. I did OBD reader on it and no codes at all - what's next before I throw in the towel and have it towed to the local shop. Thanks for the help. Frank
 

Jaryd

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Put a clear hose on the IP return. It’s about 6” long. That lets you know if air is getting in the fuel system. When the engines running if you have 1 little bubble sitting there then you are ok. if there are several bubbles then there is a leak somewhere in the fuel system.
 

Jetfrank

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Put a clear hose on the IP return. It’s about 6” long. That lets you know if air is getting in the fuel system. When the engines running if you have 1 little bubble sitting there then you are ok. if there are several bubbles then there is a leak somewhere in the fuel system.
thanks for the quick reply-was rereading other posts and realized I haven't done that. I'll give it a try. FD
 
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