Garrett Landrum

Hi i have a 1997 chevy k1500 with the 5.7 vortec. Bought the truck a few months ago and just last week it started missing, one of the plug wires was bad. Replaced all wires along with the cap and rotor and it ran perfect for about a week and today it just died on me. Wouldnt start back up, it cranked and kinda binded up like timing was WAY advanced. Got it home and took cap back off, the little metal tab on the rotor button that touches the middle of the cap was broke completely off. I put another rotor button on it and did the same thing. Took the cap back off and found that the rotor button wasnt broke and it all looked good. So changed distributor and ignition module and ignition coil and still the same thing. It cranks and gets tight and then frees up over and over. Pull the coil wire off and it cranks great.

edit: i also just checked and i have power (positive) and negative switching signal going to ignition coil, and i have tried another ignition coil and didnt fix it

oilcanhenry

That's par for the course, these days. Cheap parts not manufactured in the good old USA. Can you post any OBD II codes for us?

Garrett Landrum

Everything is accel or ACdelco other than the ignition modile. And it had a crank cam correlation code from a distributor replacement for several years and ran perfect, and i cleared that out and it didnt come back like it always did, and also at one point it threw an "ignition coil circuit high voltage" P1351 but that could have been a coincidence from me unplugging stuff.

Garrett Landrum

Also i put the motor on #1 TDC by bumping the key and watching the compression gauge and rotor button is set perfectly on #1 so it cant be the timing chain jumped right?. Also 160psi compression on at least #1 cylinder and the rest sound good. Dont have a fuel pressure gauge but i can hear the pump running and priming through the TB didnt help it. Im stumped, I need this truck for moving between houses ASAP.

Garrett Landrum

truck is fixed. when rotor button was broke it sparked inside the cap and burnt up the cap. i tried another new cap out of desperation and it’s fixed. thanks for all the help

oilcanhenry

Yeap Lots of ACDelco parts are not made in the US or CA, so they can be junk or work fine. Toss a coin, same results.

In fact ACDELCO A/C compressors have a bad reputation these days, not in the past, but Delpi has a good reputation for A/Compressors. Go figure!