P1345 code trouble

1sickcrewcab · Jul 10, 2016

Great info guys! ! Thanks.

Stephen · Nov 21, 2017

1996 Chevy SRW c3500 7.4L Crew cab with 215,000 miles. Pulled P1345 code with scanner. No Check Engine Light. Truck runs fine. Starts fine cold but takes 6-10 seconds to start when hot and is off for more than 15 mins. Will start immediately after shut down or within 5-10 mins. Have no hesitation and no effect on gas milage. Idles fine. Had distributor replaced a few years ago due to rough idle and misfiring at high way speeds.

Smokingtires · May 22, 2018

I just put a new crate 5.7 in my 1997 GMC Yukon, replaced the crank shaft sensor and the distributor. It threw the P1345 code when I started it. When I put all the new parts in the engine was on TDC and lined up perfectly.
The truck starts and runs great. When I clear the code it comes back instantly. The distributor is not adjustable manually. Any thoughts?

superdave · May 22, 2018

Smokingtires said:
I just put a new crate 5.7 in my 1997 GMC Yukon, replaced the crank shaft sensor and the distributor. It threw the P1345 code when I started it. When I put all the new parts in the engine was on TDC and lined up perfectly.
The truck starts and runs great. When I clear the code it comes back instantly. The distributor is not adjustable manually. Any thoughts?

It's adjustable, but you have to have a scanner that will read that. It isn't a simple matter of using a timing light like the old days

See this sticky on the 96+ vortec forum. http://www.gmt400.com/threads/installing-and-correctly-setting-a-vortec-distributor.6884/

Stephen · May 28, 2018

Stephen said:
1996 Chevy SRW c3500 7.4L Crew cab with 215,000 miles. Pulled P1345 code with scanner. No Check Engine Light. Truck runs fine. Starts fine cold but takes 6-10 seconds to start when hot and is off for more than 15 mins. Will start immediately after shut down or within 5-10 mins. Have no hesitation and no effect on gas milage. Idles fine. Had distributor replaced a few years ago due to rough idle and misfiring at high way speeds.

Additional info. I noticed that when I drive more, like when running errands the check engine light will go out. The next time I start it cold the light will be on again.

2jduenas · Mar 8, 2024

Stephen said:
1996 Chevy SRW c3500 7.4L Crew cab with 215,000 miles. Pulled P1345 code with scanner. No Check Engine Light. Truck runs fine. Starts fine cold but takes 6-10 seconds to start when hot and is off for more than 15 mins. Will start immediately after shut down or within 5-10 mins. Have no hesitation and no effect on gas milage. Idles fine. Had distributor replaced a few years ago due to rough idle and misfiring at high way speeds.

I have this same thing going on with my 7.4 and have changed the timing chain, sprocket, crank position sensor, crank position sensor harness, distributor, cap and rotor… I have going nuts trying to figure out what it is, if you’ve figured it out I would greatly appreciate any advice on the issue. Thanks JD

P1345 code trouble

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