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Reason I ask about doing these tests when its warm or cold is due to the nature of the problem. The truck runs great when it's cold. The issue only appears when it reaches 170 degrees. So that's why I ask if I should do it all when its warmed up or not. As for the crank position sensor, I...

& I do this after the truck has warmed up correct? Get it up to temp, shut it off, unplug optical sensor, then restart it? What's carcode?

Not sure how to check the TDC offset. I know about it, but without a tech 2 scanner, it sure if I can check it. I just have a bluetooth to phone scanner. Truck is a 96. A friend send me a pdf file outlining a way to reset it using the gas pedal? I'll try that, see what happens

Do codes need to be cleared to run these tests? Does the truck need to be up to operating temp to do these tests? Does code p1214 need to be dealt with first or does that not matter? Reason I ask is because if the truck is under 170 degrees, it runs great. No issues what so ever. Soon as it...

I do not know how to do the tests. I tried replacing the coolant crossover temp sensor. It didnt fix the problem. When plugged in, it reads a correct temp. When unplugged, it reads -40. When you unplug it while its cycling between high & low rpm, it starts to idle better but not great. Then...

Hey guys. Alright so my truck has been doing this weird thing where as soon as it gets to 170 degrees, it idles really rough, lopes, blows white smoke, & sometimes dies. It throws code P1214. I have tried two different PMD's which work. Does this lope thing with both PMD's. I tried unplugging...

Hey guys. So the other week the truck had an awful grinding noise & then it just didn't want to start. Determined it to be a combination of the starter gear teeth & flex plate teeth rounding off. So I set off to fix it. After smashing my hand & visiting the hospital, I was finally able to remove...

Any idea as to design differences? I haven't found much guidance in the ways of changing which bushing to use, but as far as trust plate design, I'm leaning more towards the middle. Obviously someone didn't machine that piece out for no reason compared to the others. The others (to me) look like...

Ok, so I got my rebuild kit in today. Took all my old turbo main parts (core, snails, blades, bolts, etc.) to work today to use the clean tank, gonna let those sit overnight in the solvent. As for the replaceable parts... what is the differences? Apart from the brass bushings (one has a lip & is...

Ok, so heres my story. I moved from CO to CA (worst mistake) about 2 years ago. In the process, I left my truck in good hands at a reputable diesel shop to have them store it/we were talking about doing a 12v swap. Anyways, that never happened, & the truck has just been sitting. Well, the day...

I'm curious to know what happened as I will be rebuilding my GM4 here soon as well. What kit did you end up ordering?