I have a 95 cummins 12v with 370 hp injectors #10 plates straight piped and im starting to experiance problems. It sounds like its missing at low to mid rpm range it runs pretty rough at low to mid rpms. with excessive smoke on acceleration injectors have 7000 miles on them. on acceleration it sounds like the turbo is surging and i can hear the miss through the exhaust and intake. Does any body think they might know if its the injection pump ot the injectors??? or how can i figure it out?
thanks
ty

 

Welcome aboard coldaim. I can't be much help on tellin you what this migh be but as a suggestion I would recommend one of the auto Stethoscopes to see if you can pinpoint where anything might be sounding odd. You can use it to listen to the individual injectors to see if one of them is knocking or if it's coming from the engine itself. They cost you $10 from any auto parts shop and are handy to have around.

I'm sure somebody will come on more familier with the 12V and be more help then I am though. Be sure to fill out your signature so it will show up each time without you having to type it all out.

 

its not in the motor its in the fuel system and whem i accelerate you can definately hear it, it sounds like 1 or more of the cylinders is backfiring out the exhuast

 

Are still able to use the truck or is this a problem you need help with right away.

 

Its driving fairly.

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Its pretty much urgent. It barely drives. The EGTs are a little bit warmer than they usually are.

 

This will get the quickest attention by being in here. Hopefully somebody can get you fixxed up before this get's to be a bigger problem.

 

Thanks, with our gasser dodge in the shop the cummins going down will be a major blow so any body able to help at all would be great.

 

when was the last time that you adjusted the valves? depending on the miles you have on the truck and the last time the valves have been adjusted it could be this causing the problem.

 

I only have real basic suggestions...

It kind of sounds like injectors to me. If you have an infrared thermometer bounce it off each of the exhaust ports on your exhaust manifold. See if there is an bug difference in temps from port to port. If one is way hotter then you probably have a leaking injector. If one is way cooler than you probably have an injector not popping off.

You can get those thermometers at Radio Shack for about $50. They work nice for diagnosing brake pulls too.

http://www.radioshack.com/search/ind...ermometer&sr=1

 

change yer fuel filter and clean the screan and see what that does