Question about 2000 Chevrolet Astro

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P1345, won't start, sputters and snorts when cranking starter. on a 2000 chevrolet astro awd. prior to present problem, replaced timing chain, spark plugs, distributor cap and rotor. it started and ran fine but ses light remained on. kicked out a p0340. pulled the distributor cap and rotor, checked the screws holding the camshaft positioning sensor, and returned the cap and rotor. it wouldn't restart. replaced the camshaft positioning sensor and reset the pcm trouble code memory. then it kicked out the p1345.

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P1345 code problem:------
This code is set when either the CAM sensor is not in it's correct position, or when the crank and cam sensor don't agree on position of the pistons.
These new OBD-II motors are very tempermental and need to run exactly the same all the time.
Why the code??? Did you do any work on this truck? Set the timing? Remove the distributor? Anything that may have bumped the crank or cam sensor? Did you go off road in the mud? Did you have a lot of rain before this happened? Could this sensor be out of adjustment?
It could be a connection, or a bad sensor. Could be a streached timing chain. Could be a worn cam shaft. Anything that could cause these two sensors (crank and cam) to not agree.
If you run bad, it could be the computer trying to compensate for the descrepency between the two sensors. It could be a real problem, like a misfire or bad timing chain.
Check your vacuum. This will tell you if you have out of adjustment chain, or a misfire.
Check your compression. This will tell you if you have a bad chain, or a problem in a cylinder.
Most of the time this is caused by a distributor not insalled correctly, if this is not the case other causes are:--------
A loose CMP sensor causing a variance in the sensor signal
Excessive free play in the timing chain and gear assembly

Incorrectly installed distributor - 1 tooth off in either advance or ****** positions

A loose distributor rotor on the distributor shaft
A loose or missing distributor hold down bolt

A faulty crank position sensor.
Connect scan tester to vehicle. Start engine and observe engine RPM. If RPM fluctuated up to twice desired RPM, replace crank shaft sensor and retest. If RPM does not fluctuate up to twice desired RPM, check for proper installation of distributor
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 06, 2010


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