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OK guys, thanks for all of your help with my truck. I just finished replacing the 1 bad injector I had that was giving me a rough idle and now it runs great.
I also had exhaust backpressure code (po470 I think), I pulled the tube off and inspected it, had some carbon buildup but was not stopped up. I cleaned it out and re-installed. Do yall know any way to check and see if the cat is stopped up w/o cutting it off and looking through it?
yeah, a friend of mine has a really nice Snap-On handheld scanner that will do the buzz test as well as cylinder contribution test. The bad injector buzzed fine but the cyl. cont. test said it was bad. I pulled it and had it rebuilt, put it back in, runs smooth as silk again.
By the way, if any of you gys need injectors rebuilt, go to Diesel Pump and Injector Service in Houston (formerly Houston Fuel Injection), they only charged me $129 to rebuild my injector, that's way cheaper than a reman anywhere else.
Oddly though, they will only rebuilt the 94-97 and early '99 injectors, they sell remans only for everything else. They said something about that the newer ones were built alittle differently and that they were harder to service.
Since diesels have to be sequential injection, instead of bank injected like gassers the ecm is capable of distinguishing each injector and firing it seperatly, so with the proper test equipment you can test 1 injector either by "buzzing" it, or drop it out and seeing how much each cyl drops the idle rpms as you take that one off line.