Head scratcher rebuild 05 HD 1500, No fire

1999 Z71 · November 30, 2020

Son and I rebuilt the stock 6.0 with 346k miles had blown head gasket and piston slap. Reinstalled and now crank no fire. Has fuel and air. We put two code readers (orange obd pocket scanner and a tuner scanner) and get zero codes. We had three codes and truck was in limp mode before we pulled engine. Now we have no codes, power to coil plug on each side and no fire coming out of any coils now. Grounds and 12v are good to new cam sensor and new crankshaft sensor, checked both at the plugs. All grounds are attached to block and checked with test light to 12v at battery. All fuses good, relays pulled and tested for resistance. Main coil plugs on both sides have 12v and ground coming in and no fire out of coils. Need to know if a real scanner can pull codes in memory or are they all erased since battery was unhooked for awhile? Do I need to get it flashed? Scratching head and watching ALOT of videos lol.

Threw a few new parts at it

Throttle body

MAF

Thanks for any input.

Edited November 30, 2020 by 1999 Z71
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riverbanks · November 30, 2020

What were the three codes?and do you see rpm's on scanner when cranking?

1999 Z71 · December 1, 2020

0053 was most recent code prior to pulling running engine. 0300, 1516 were codes when blown head gasket first caused any issues. No rpms on 3rd scanner.

riverbanks · December 1, 2020

No rpms,any chance you have the original crank sensor?or try, trouble shootmy vehicle.com/test a crank sensor

1999 Z71 · December 1, 2020

Thank you for answering. Yes I have original crank sensor and it's a hall type that I cannot figure out how to bench test. What scares me is the chance of the new sensor being bad.

riverbanks · December 1, 2020

It bad,or wiring to it,weak spot is right behind power steering pump, follow the procedure on the site I mentioned,if it's wiring, you know where to look

1999 Z71 · December 3, 2020

Well its running. Took new crank sensor back to Oreillys, popped in the newest one and this is where I messed up. I bought a MAP sensor and installed it at same time so I have no idea if new crank sensor was bad or MAP sensor solved it but it fired up for first time since September. Then did the break in on new engine then shut it down for evening. Next day no start, flooded. Changed plugs and fed it some break cleaner into the MAS and got a few cylinders to pop and it finally cleaned itself out and was idling smooth and took it for its first test run. Just started it back up this morning and its idling beautifully. Now off to get inspection. Thank you for the input, I truly appreciate the response.