Question about 1999 GMC Suburban

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99 GMC suburban 5.7l P1345 wont start/misfire

Sounds like a misfire when i am driving down the highway, and now it is seemingly cutting out. got code P1345, i have tested the crank sensor, fuel pressure. motor was replaced recently. PCM and body control module was replaced and reprogrammed by the dealer. sometimes it starts fine. others it will take me 10 minutes of tinkering to get it started (and i dont think its anything i did to make it start) could this just be off its timing, or should i look at replacement of the cam sensor/distributor?

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  • GMC Master
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Possible causes for p 1345 code
engine mechanical condition--valve timing off
cam sensor or crank sensor are loose on their mountings
faulty cam shaft position senor
faulty crankshaft position sensor
rech notes
if this dtc started after recent internal engine repairs, inspect for proper engine mechanical timing .
with the camshaft cover off and the no 1 cylinder on ydc, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets
I f a p 0016 or p 1345 is resetting without any engine performance concerns but the above information did not isolate a cause for the dtc , replace the cam phaser actuator sprocket
reference
www.autocodes.com
that site goes on to explain how and where the sensors operate and located

Posted on May 24, 2017

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  • GMC Master
  • 8,273 Answers

The primary intent of this code is to detect slipped camshaft timing. Have you checked the camshaft timing? Your symptoms indicate you are a tooth off.

Posted on May 24, 2017

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Posted on Jan 02, 2017

  • 94 Answers

SOURCE: GMC Sierra 2002 4.3 V6 P1345

intake gasket i had the same problem with my truck

Posted on Mar 09, 2009

big tv set
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SOURCE: 02 GMC Sierra 4.3 V6 P1345

Well that sounds like a tough one , But here is a site worth checking out . Several mechanics use this it to help out people like your self that are frustrated and are getting P #$%$# off ! Good luck

http://www.obd-codes.com/forums/search.php?search_id=active_topics

Posted on Mar 09, 2009

  • 832 Answers

SOURCE: I replaced the ignition control module in my 99

Check the spark plugs, if it still produce the required
spark enough to start your engine.

Posted on Oct 01, 2009

  • 11 Answers

SOURCE: 1997 GMC Yukon won't start.

WHEN YOU REPLACED THE FP DID YOU OR THE DEALIERSHIP REPLACE THE FUEL FILTER MAYBE YOUR PROBLEM ....

Posted on Dec 09, 2009

Testimonial: "They did replace the filter but thank you very much for the tip."

  • 5 Answers

SOURCE: wont start

fuel pump maybe

Posted on Feb 22, 2010

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Well that sounds like a tough one , But here is a site worth checking out . Several mechanics use this it to help out people like your self that are frustrated and are getting P #$%$# off ! Good luck

http://www.obd-codes.com/forums/search.php?search_id=active_topics

Mar 09, 2009 | 1999 GMC Jimmy

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