Hi,
I'm chasing a timing issue and I need your help.
The truck is a 93 silverado 3500drw, 2wd, 454 auto. Brand new stock rebuild on the engine by reputable shop, they've done 10 or so remans for me with great results.
. Initial startup is done but hasn't been on road yet to break in rings.
I have a video of the timing jumping around.--
Timing. Video taken with tan/black ECT wire disconnected.
Disconnecting ECT wire gives corresponding dtc code, which clears when re-connected. Distributor is new, old one had a little runout but same jumpy timing.issue.
Both connectors on ignition module replaced.
Harmonic balancer looks great. No runout, no shift from factory position, rubber not rotted, etc.
I'm a little bit stumped and could use your input. Thanks in advance!
I'm chasing a timing issue and I need your help.
The truck is a 93 silverado 3500drw, 2wd, 454 auto. Brand new stock rebuild on the engine by reputable shop, they've done 10 or so remans for me with great results.
. Initial startup is done but hasn't been on road yet to break in rings.
I have a video of the timing jumping around.--
Timing. Video taken with tan/black ECT wire disconnected.
Disconnecting ECT wire gives corresponding dtc code, which clears when re-connected. Distributor is new, old one had a little runout but same jumpy timing.issue.
Both connectors on ignition module replaced.
Harmonic balancer looks great. No runout, no shift from factory position, rubber not rotted, etc.
I'm a little bit stumped and could use your input. Thanks in advance!