Question about Chevrolet 2500

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TOTAL MISFIRE ON ALL CYLINDERS, ENGINE FAILING AND FINALLY WILL BARELY START. DTC CODE P1345,P0108,P0134, ON SCANNER .. REALLY COULD ILLUSTRATION FOR FIRING ORDER ON 2000 CHEVY 2500 HD 5.7 LITER AND FIRING ORDER ILLUSTRATION ON DISTRIBUTOR? FOR VORTEC ENGINE .. ALSO NEED TIMING SPECS... ANY HELP?

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  • TIM B.
    TIM B. Mar 14, 2011

    Can 1 thing be causing all three codes read on scanner.? also any illustration available for firing order on distributor, and engine illustration showing number 1 cylinder ... and timing specs for this specific engine. This engine is popping and back firing like crazy . // any help

  • TIM B.
    TIM B. Mar 15, 2011

    So what your saying is all three sensors went bad at the same time..?

  • TIM B.
    TIM B. Mar 15, 2011

    Are you sending pictures because i am just getting boxes with red x in them ? see below:
    firing order:18436572

  • TIM B.
    TIM B. Mar 15, 2011

    Are you saying i need to replace all three of these sensors?

  • TIM B.
    TIM B. Mar 15, 2011

    did not receive the diagram? maybe send to my email bbstoboss@aol.com thanks
    Understood domino effect. which is the best guess on what sensor to replace?

  • TIM B.
    TIM B. Mar 15, 2011

    We found that the rotor inside the distributor came loose and 1 of the screws came out? We replace the cap and rotor . All codes gone now, can you believe that? Also changed the spark plugs , it is running great now. Maybe keep this in mind for future diagnosis problems. Thanks for trying anyway...Thanks Tim,

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P0108 - Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
P1345 - Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation
P0134 - Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1

firing order:TOTAL MISFIRE ON ALL CYLINDERS, - moz-screenshot-1.png18436572

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Posted on Mar 14, 2011

  • 2 more comments 
  • Tre Elkins Mar 15, 2011

    no one thing for EACH code, each code reads from A DIFFERENT ISSUE.

  • Tre Elkins Mar 15, 2011

    yes i sent you a diagram, but what it is ,is that the one sensor went, then started a domino effect

  • Tre Elkins Mar 15, 2011

    i would start with the map sensor and go down the list.....i will resend the firing order diagram to your email shortly, is there anything else i can do for you? and please dont forget to rate.

  • Tre Elkins Mar 15, 2011

    hey glad everything went well i will remember this. good luck in the future
    d

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#2 cylinder misfire


This is also causing your miss also
GMC Forum: P1345 Camshaft to Crankshaft correlation faulty
Originally Posted by piecesholden@hotmail.com
I hooked my 1997 sierra up to a OBD Scanner and it reads that i have a P1345 code which is a camshaft to crankshaft correlation fault. Could it be a bad sensor or is it automatically my timing change that needs to be replaced? You are correct, the ECM has detected the timing from the crankshaft and camshaft is off to far to set off the DTC code P1345. It's more common for distributor gear to be worn then your timming chain. If your timming chain is stretched, you can hear it rattleing under hard acceleration.

The 1996 and newer Vortec is a non adjustable timing. There is a very good chance that replacing cam position or crankshaft position sensor will not fix this problem. This code tells you that the base timing of the vehicle is not correct. You really need to get the vehicle scanned with a scantool that will read the cam retard with the engine running over 1200 rpms and then make adjustments by turning the distributor, unless it is timing chain/gear stretch/wear or wear on the distributor gear. You could mark the current distributor orientation and turn the distributor counterclockwise, clear the code and start the vehicle and rev over 1200 rpm to see if it comes back, but the scan tool that can read the cam retard is the best way.

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. But i would look in to repalceing the worm gear at the bottom of the distributor shaft, the 97 and 98s, Vortec engine is that the 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. Also, the real big problem is that the gear is also hooked to the oil pump and at 75 or so, it may strat to mis-fire and backfire because the timing is so far off and the oil pump is also run off the same gear and your oil pump can fail.

This is a common problem with that vintage of GM distributors because you could usually adjust the timing enough to get the code to go away but you are just masking the real problem. Friend is a GM certified Tech, worked at an Olds dealer for 10 years before opening his own place, but he had never herd of this as being common. He then proceeded to show me a box with about 25 to 30 gears all worn the same way and all from 96 thruogh 99s that had SES lights on. And now with a $40 part and less than two hours labor and ten minutes on a scanner all these 100K mile trucks run fine and can pass E-Test.

Good luck and you really need a Tech2 scanner to get a better picture on why your getting a P1345 DTC code, but most likely it's going to be a $40.00 distributor gear.

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G290076t1 : CHECK COIL FUNCTION BY SUBSTITUTION
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-> No

G290076t2 : CHECK THE IGNITION COIL SUPPLY VOLTAGE CIRCUIT
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