p1345 code

[gmloyalist]

throwing this code upon 1st start up. notice that the engine has a knock (wristpin?)when cold,is the knock sensor picking up on the knock causing it to throw this code.. anyone?

 

[jagtoes]

throwing this code upon 1st start up. notice that the engine has a knock (wristpin?)when cold,is the knock sensor picking up on the knock causing it to throw this code.. anyone?

This is a crank sensor problem. I would suggest you unplug ,clean and replug the sensor and then reset the code. If it still happens then you would most likely need to replace the sensor. What year and engine do you have. Are there any other codes after the P1345. How many miles on the truck. Did you have any recent work done on it. More info please.

 

[gmloyalist]

it is a 98 2500 sierra 4x4 with 350, no work done, just turned 85,000 miles.

 

[gmloyalist]

truck just died on me leaving the yard! p1345 code.is this the sensor under the cap or in the timing chain cover? anyone?

 

[Molson02536]

throwing this code upon 1st start up. notice that the engine has a knock (wristpin?)when cold,is the knock sensor picking up on the knock causing it to throw this code.. anyone?

I checked my shop manual and the proper code identification for a P1345 is "Crankshaft position sensor / Camshaft position sensor correlation". Same code for both and it either is malfunctioning or needs adjustment.

FYI The cam position sensor is in the distributor and the crankshaft position sensor is mounted to the bottom of the motor near the balancer.

The 97 and 98s, the distributor gears were soft and they would actualy wear enough to through off the timing and you could try to adjust the timing but at some point you'll run out of adjustment.

So before you start buying sensors and other misc. parts , try the gear if you are getting a P1345 code. Good luck and keep us posted.

 

[gmloyalist]

well got hurt at work so sent it to the garage and they replaced both sensors..aagghhh!also complete tune up .. seeing everything had never been replaced. anyway ran great for a few weeks then... p1345 code again! it was pretty cool that morning, cleared it and has not been on since(a few weeks).this truck has really been bleeding me! anyway just wanted to update this.

 

[navarrodragon25]

I got a catalytic converter issue on my 1996 sierra 7.4 vortec with almost 300,000 miles.

It has new lifters,rods,cam,sprockets,chain,oil pump,stater,crank chaft sensor,cam shaft sensor,disributor cap,plugs and wires etc.Not sure if it was caused by engine problem related to this code but I was told that if I don't fix this code issue then a new converter could be ruined.

At any rate, even though the engine rides perfectly smooth most of the time (after some major engine work ) it will get Hot under the hood (even though the thermostat gauge shows a good temp) after about 20minutes and it will hesitate and surge. All clues point to a bad converter clogging up causing back pressure and eventually causing it to totally bog down and die. Interestingly it does not do it as soon as I start it and is not continuous but only starts to have a problem after the 20 or 30 minutes.

I have heard clanking and rattling under the truck twice. Once seeminlgy by the converters(there are two and fairly close together) and once more close to the rear of the muffler.

QUESTION #1 If this were a "TIMING ISSUE" woudn't it ride rough ALL the time and not so smoothly when I first start it?

... and oddly today I happened to take OFF the spark plug wire to cylinder ONE while it was running and the engine continued to run fine and was totally unaffected.

QUESTION #2 What would cause the engine to run smooth with a spark plug wire off? ( I had a loose spark wire years ago and it idled horribly from the moment I started it up)

Question # 3 Would the spark plug situation be caused by or related to the P1345 Code? ..HOW?

When I finally fix the code problem THEN I will change the catalytic converter.