no stat after replacing harness...

[Strokin304]

After having some electrical issues we replaced the main engine harness. Replaced starter and got new batteries as well. Truck turns over but wont fire up. Have fuel in upper bowl, have good high pressure oil (1.5-2 volts tested with meter while cranking.) Swapped FICM(mine tested fine but just to rule it out) with a known working one. There is small puffs of white smoke coming from the tail pipe while cranking. Any help would be greatly appreciated.

[m-chan68]

Originally Posted by Strokin304

After having some electrical issues we replaced the main engine harness. Replaced starter and got new batteries as well. Truck turns over but wont fire up. Have fuel in upper bowl, have good high pressure oil (1.5-2 volts tested with meter while cranking.) Swapped FICM(mine tested fine but just to rule it out) with a known working one. There is small puffs of white smoke coming from the tail pipe while cranking. Any help would be greatly appreciated.

When you say puffs of smoke, is that supposed to mean it TRIES to start? If you so, I'm going to go out on a limb and say your issue is either insufficient fuel pressure and/or non-firing injector(s) causing your no-start issue. Just by virtue of the fact is TRIES to start tells me you have ICP pressure (1.5 to 2.0 volts is more than sufficient) and FICM_SYNC as well as SYNC. Does fuel fill up the secondary fuel filter housing instantly and overflow rapidly when you cycle the key to RUN? If so, you likely have more than sufficient fuel pressure. Do you hear ALL injectors pre-cycling when you cycle the key to RUN? If so, you need to get your hands on a scan tool that can run an Injector Buzz test. Listen carefully for buzzing of all eight injectors when the test commences, to be followed by clicks from each individual injector in cylinder NUMERICAL order (not engine firing order). The NON-CLICKING injector(s) will be the one(s) not firing that's likely causing your no-start, provided there is sufficient fuel pressure (about 56 psi or more at key-on/engine-off).

[Strokin304]

Thanks M-chan68. We are going to get a scan tool today. We were leaning towards fuel but I will say the bowl fills up seconds after key on. We have tested that a couple times visually. Injector test will be first on the list with the scanner. I did just have one injector replaced because of a broken clip (previous owner). But the truck was running great before it shut down. Thanks for the input and i will keep you posted.

[Strokin304]

ok so scan tool showed no CMP....im a dummy and didnt plug it in. So fire her up and she starts....but rough and you have to stay on the throtte to keep her running. When it shuts off by itself the glow plug and water in fuel indicator lights up. Also its showing P0285. Would one injector cause all of this? This is what it was doing before i replaced the harness....i am lost.

[Strokin304]

well one injector was shorting to ground i guess, because while plugged in it would reset the PCM. unplugged injector number 2 and it runs fine or as fine as it can with 7 working injectors.