Engine/Transmission (1994 - 1998) truck cutting out

[GOODE11]

Hello everybody,

I have a few ?'s for you guys out there. I recently posted a topic on trying to track down a engine vibration. Thanks to all that posted their suggestions. I have put in a new fuel filter, checked the air filter, and cleaned the prefilter. None of the three were dirty at all and to make it short:



It still vibrates badly from about 1800 rpms on up and its especially bad under heavy loads.

The other day I was reving the motor to see if I could hear anything at a stand still. And sure enough if I mash the accelerator the engine starts stumbling and vibrations begin about 1800rpms. The exhaust note starts a popping sound. But the stumble is not present w/ driving the truck, just the vibration.



What do you guys think? Injectors, pump timing, lazy valve? I'm trying to narrow my options b/c I am a shadetree mechanic w/ limited time, but I will take it to a fuel shop if need be.



What do you all think?

 

[RHARVEY]

Did it jump time????



Rick

 

[GOODE11]

Do you mean pump timing? This is what I thought. I remember someone saying that if the KDP comes out pump timing my be affected by the front timing case moving. Mine did come out.

Maybe I should persue this avenue?



Thanks for the info

 

[illflem]

If the case is lose from lack of a kdp pin and lose bolts you can feel it move just slightly. I would go ahead and have the timing set at 15. 5-16, every truck should be set at least there.

 

[Steve Roseman]

Pull your injectors and have them tested before you do some major damage! If you have an injector spewing fuel all the time you could melt a piston.

 

[GOODE11]

Thanks for the info guys, looks like I'll be heading to the fuel shop early next week.



Thanks again