I have a 97 S-10 with a 4.3L. I just put an engine in it and it is hard starting and when cranking pauses in between cranks sometimes. Once started, it runs pretty smooth but when you bring the idle up, the check engine light comes on and when you check it, it reads P1345 trouble between cam and crank sensor. I replace both. The crappy Haynes manual said that you only need to be withing a few degrees of TDC on the #1 cylinder. Is it possible that I am a tooth off? Would it set a code like that?
Let's back up. On top of the distributor with the cap removed there is an "8" and a "6" on the edge. With the harmonic balancer set with its' mark lined up with the timing pointer of the timing chain cover, the tip of the rotor should be lined up with the "6". If not, remove the hold down bolt, raise the distributor until the rotor can be turned, rotate rotor and set down until rotor of tip lines up with "6". See if it cranks normally then. A worn distributor gear (sharp edges) will also set this code and cause starting problems.
YES BEING A TOOTH OFF will set the code ,, also did you remove dist. ? if so take cap off and look @ mounting area ,,mark your # 1 and drop in ,,,also a worn dist . gear will set this off ,, and if it is a vortec with flat cap, style do you have flat cap or reg. dist cap ??if it is flat cap look on mounting area on dist there are 2 marks , do not line up on # 1 ther will be a 6cyl. mark or an 8 cyl. mark ,, that is tech , your start ( # 1)
P1345 GM
Camshaft to crankshaft position correlation fault
The ECM detected that the cam and crank sensor positions were out of time
If your scantool gives the value for cam ******(sometimes called camshaft offset). You have to rev the engine over 1000rpms for it to be accurate. Now to adjust the cam ****** to within spec- 0 degrees +/- 2 degrees, if the value is too negative you turn the distributor counterclockwise and if the value is too positive you would turn it clockwise. If you can't get it to zero, there is a chance the distributor is a tooth off.
I have read all of these answers and all have to do with the symptoms of the problem but not the real problem .
The real problem is the distributor shaft it self . Its plastic on a metal shaft and it wares out to fast .
The 4.3 has 4 main bearings on the crank and 4 bearings on the cam .Yet the factory manaul says going down a bumpy road will set the cam / crankshaft pisition sensors off do to crankshaft wipe.
But the plastic distributor witch the camshaft sensor is located in and the shaft will always run true from the drive gear at the camshaft to the distributor rotor and cap .
Seeing how their is no adjustment at all the base of the distributor to slightly correct for any deveation between the laser sharp corralation that the cam and crankshaft sensors have .then it must be crankshaft wipe.
So I bought a new dist shaft 135 dollars came with cap and rotor all with copper contects and the base was made out of metal not plastic .Then I started micking the 2 old dists shafts that I had and compareing then the tolenances between them and the new one and found them to be so far you 50 to 60 ths at the base and 120 + at the top .
Put the new distributor in end of problem .
I think crankshaft wipe could as bad as Global warming in the futher
I have seen this before and am experiencing the exact same thing in a '98 Safari van I just replaced the engine in.The PCM looks for uniformity between the degree of rotation reported by each of these sensors. If they do not agree, the PCM will only be guessing at controlling the engine. You should see a professional who can reset the distributor timing with a computer, that is the only way it will ever be right.
How would the distributor have anything to do with the timing between crank and cam? Both sensors read a waveform pattern genrated by both the crank and the cam if those sensors are not in sync with eachother the the code is for cam/crank sensors and the distributor has no effect whatsoever on those positions yes it is related to timing but only so the PCM knows what position the motor is in. Therefore I fail to see how moving the distributor will affect this code
What I think u need to do is backprobe the connectors at the cam and crank sensors with a lab scope and view the waveforms. Also check the connecters for the appropriate reference voltage. I think this code is most likely due to a bad sensor or a short in the circuit. I can't see how the distributor timing has anything to do with the set mechanical timing between the cam and crank as the only way to change the timing between them would be to take of the timing chain.
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