What engine ? could have come with different one's - 5.0 , 5.7 l
DTC P1345 Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation
This diagnostic trouble code (DTC) monitors the crankshaft position (CKP) and the camshaft position (CMP) signals to determine if they are synchronized. If both signals are not observed by the control module within a narrow time window, the vehicle control module (VCM) will determine that an error has occurred.
Diagnostic Aids
Check the following items:
• 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 retard positions
• A loose distributor rotor on the distributor shaft
• A loose or missing distributor hold down bolt
An intermittent may be caused by any of the following conditions:
• A poor connection
• Rubbed through wire insulation
• A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
It helps if you have factory service repair info. After replacing the crank & cam sensors did you do a Crankshaft Position System Variation Learn ?
Install the scan tool.
Apply the vehicle's parking brake.
Block the drive wheels.
Close the hood.
Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
Idle the engine until the coolant temperature reaches 65°C (150°F).
Turn OFF all the accessories.
Important: If the CKP System Variation Learn Procedure cannot be completed successfully, refer to DTC P1336 Crankshaft Position (CKP) System Variation Not Learned for additional diagnostic information.
Enable the Crankshaft Position System Variation Learn Procedure with the scan tool.
Important: After the ignition switch is turned to the CRANK position, the VCM must see a change in the state of brake switch (Released to Applied) to run the learn procedure. Also, the service brakes, and the parking brake, must be applied throughout the duration of the learn procedure.
Apply and hold the service brakes.
Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine will respond to throttle position after the learn procedure is complete.
Slowly raise the engine speed to 4000 RPM.
Immediately release the throttle when the engine speed decreases.
Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.
Your going to learn this isn't easy .
No such code OBDII codes are 5 digits, not 6.
SOURCE: 1999 Suburban 5.7L Misfires when it rains.
Did you change the plug wires?A good way to find an ignition problem is to take a spray bottle with water and spray your engine.This will show up bad wires or ignition arcing in the dark.Try spraying the coil also.Hope this helps.Good luck.
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