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Trouble code P1345 did tune up still have problems

Tiny
FIXTRUCK
  • MEMBER
  • 1996 GMC C2500
  • 262,000 MILES
Have 1996 gmc pickup sierra 2500 4x4, 5.7 liter. Trouble code p1345. Mechanic replaced distributor, crankshaft sensor, plug wires, coil, battery. Same problem. Misfires badly when rainy/humid. Run better after engine is hot or parked hot for awhile.
Monday, November 21st, 2011 AT 9:55 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did he check the timing chain for deflection?

Roy
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Monday, November 21st, 2011 AT 10:07 PM
Tiny
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I doubt it, but would damp weather affect that. The problem goes away when the engine has run hot for awhile, or when the weather is hotter and dry.
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Tuesday, November 22nd, 2011 AT 12:55 AM
Tiny
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Ok, how about the coolant sensor? This will effect fuel mixture according to temperature.

Roy
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Tuesday, November 22nd, 2011 AT 12:56 AM
Tiny
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Was wondering if the wiring, etc. Between the cam sensor and crankshaft sensor could be going bad since it is affected by rain and high humidity so much.
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Tuesday, November 22nd, 2011 AT 1:02 AM
Tiny
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Could be. Ohm it out to confirm.

Roy
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Tuesday, November 22nd, 2011 AT 1:06 AM
Tiny
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Doubt if coolant sensor was checked. P1345 code was for crankshaft position/camshaft position correlation fault, so I think they were concentrating on those two areas.
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Tuesday, November 22nd, 2011 AT 1:13 AM
Tiny
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How do I ohm it out. Are they directly connected or is there something between them?
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Tuesday, November 22nd, 2011 AT 1:17 AM
Tiny
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You need to see the color wires for the sensors back at the pcm. You connect one lead at the pcm and the other at the sensor and make sure you have a reading.

Roy
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Tuesday, November 22nd, 2011 AT 1:19 AM

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