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Old 06-01-2013, 12:47 PM
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P1345 code 1996 gmc truck

what type of scaner do I need to set dist. timing and what is the cost of this device?

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Old 06-01-2013, 01:23 PM
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Originally Posted by lowhirod View Post
what type of scaner do I need to set dist. timing and what is the cost of this device?
You can't set distributor timing - the computer does that. Changing the distributor position will change the cam position sensor phasing, but the computer uses the crank position sensor to trigger the ignition unless that sensor has failed and it has defaulted to a backup mode. The cam position sensor is mainly used to tell the computer when a given cylinder is on the compression or exhaust stroke, and to sense a misfire. The computer reads changes in the relative position of the cam and crank sensors to detect a misfire.
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Old 06-01-2013, 02:00 PM
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Incorrect. The P1345 is cam/crank correlation code and has to be within +/- 2 degrees or the code will set. The adjustment is made by turning the distributor and observing the advance on the scanner. You will only have about 15 degrees? or so total adjustment. If it's still not within range, you'll have to pull the distributor back out and readjust a tooth forward or backward.
I can't say what the cheapest scanner that can read the cam/crank correlation, but you may want to pay a professional to be responsible for this job. May wind up being cheaper and less of a headache for you.
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Old 06-01-2013, 02:43 PM
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Originally Posted by UltimateRoadWarrior View Post
Incorrect. The P1345 is cam/crank correlation code and has to be within +/- 2 degrees or the code will set. The adjustment is made by turning the distributor and observing the advance on the scanner. You will only have about 15 degrees? or so total adjustment. If it's still not within range, you'll have to pull the distributor back out and readjust a tooth forward or backward.
I can't say what the cheapest scanner that can read the cam/crank correlation, but you may want to pay a professional to be responsible for this job. May wind up being cheaper and less of a headache for you.
ditto, how many miles on the truck, if you haven't moved the distributor at all, it might be the timing chain is worn/loose
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Old 06-01-2013, 03:37 PM
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If the distributor hasnt been removed, and the code is coming up, it is most likely a worn dizzy gear.
You will need a good scanner wi Bi directional controls to perform the cam/crank position relearn . And thats after you repair the reason why it set.
As stated before, check timing chain slack.Then I would be suspect of the dizzy gear. They seem to wear fast, and it may not look to bad to you, but to the trained tech.....
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