P1345 code.. truck runs fine, should I mess with it?

JeezLouiseGMC · Apr 25, 2019

1999 k1500 Sierra 5.0l
I had a friend run the check engine light on my truck this morning and as afore mentioned it threw a p1345 code for crankshaft position correlation. The truck runs and starts wonderful and really has no issues other than a minor, and I mean minor shake at idle.. should I mess with it? And if so what is my best course of action?

94burbk1500 · Apr 25, 2019

I don't know why you would knowingly neglect an issue with your truck, unless it's just a beater. If the truck runs fine, it could be as simple as a loose retaining bolt or connector for either the crank or cam position sensor, or one of the sensors could be bad. Worst case, you need to redo the timing and replace the timing set.

JeezLouiseGMC · Apr 25, 2019

94burbk1500 said:
I don't know why you would knowingly neglect an issue with your truck, unless it's just a beater. If the truck runs fine, it could be as simple as a loose retaining bolt or connector for either the crank or cam position sensor, or one of the sensors could be bad. Worst case, you need to redo the timing and replace the timing set.

Welp Ill check it out and I won’t be opposed to changing it out but it shouldn’t be a timing set because the engine is relatively new. Anyways I appreciate the help

94burbk1500 · Apr 25, 2019

JeezLouiseGMC said:
Welp Ill check it out and I won’t be opposed to changing it out but it shouldn’t be a timing set because the engine is relatively new. Anyways I appreciate the help

Of course man, that's what this place is all about. You say the engine is relatively new, is it a crate engine? Did it come with all new sensors? If so, what brand?

someotherguy · Apr 25, 2019

P1345 most likely suspect is worn distributor gear or upper bushing. But, since the engine was replaced, the distributor is most likely just not set correctly. Takes a scanner that can read the can retard angle, set to within 2° +/- of zero while holding the rpms up to at least 1000 for a good reading.

Set correctly, it should run better. If it doesn't want to hold a setting then check the distributor for aforementioned wear...

Richard

94burbk1500 · Apr 25, 2019

Listen to Richard, he knows way more than me!

L31MaxExpress · Apr 26, 2019

The cammed 5.0L in my 99 Tahoe had the P1345 code. CMR was 16* off. Restabbed the distributor and set as close to Zero ad I could (0.5+ from memory) Bottem end torque, throttle response and gas mileage was much better after. Oddly it seemed to pull just as well at WOT and high rpm.

454cid · Apr 26, 2019

My truck didn't seem to run any better after adjustment but it was only 7 degrees. I don't think it sets a code until is 20 something. Now it jumps between 0 and 1.

JeezLouiseGMC · Apr 26, 2019

94burbk1500 said:
Of course man, that's what this place is all about. You say the engine is relatively new, is it a crate engine? Did it come with all new sensors? If so, what brand?

It is a jasper 305 stock replacement so I really wouldn’t to expect and excessive wear but I still appreciate any input. I would have a hard time believing the distributor considering the engine has less than 100,000mi on it (I’m not exactly sure since I bought the truck with the engine previously replaced, I suspect it’s around 70,000)

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JeezLouiseGMC · Apr 26, 2019

I appreciate all the help guys, can anyone link me to a thread or video describing how to adjust the timing?

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P1345 code.. truck runs fine, should I mess with it?

JeezLouiseGMC

OBS Enthusiast

94burbk1500

I'm Awesome

JeezLouiseGMC

OBS Enthusiast

94burbk1500

I'm Awesome

someotherguy

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94burbk1500

I'm Awesome

L31MaxExpress

I'm Awesome

454cid

Sooper Pooper

JeezLouiseGMC

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JeezLouiseGMC

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