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2003 Trailblazer 4.2L engine miss - NO CEL Illuminated - HELP

189 Views 3 Replies 3 Participants Last post by  chem_man, 
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Hello everyone, so my 2003 Trailblazer with 185k miles 4.2 liter started to miss.
No CEL currently lit and nothing in history but during cold weather I would occasionally get a P1345 and after the weather warmed up it would go away.
The engine miss started about a week ago and it's getting worse.
Does anyone know if my problem is associated with the P1345 even though it's not currently lit.
Has anyone experienced a similar issue that can share a possible solution?
Thanks !
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SR3000
Do a search here. I did and tried to quote it to give you a link but it didn't work. It sounds a lot like what you are describing. Turned out to be a timing chain.
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SR3000
Found it:
www.trailvoy.com

[SOLVED] - Code P1345 - No Driveability Symptoms - Need TSB

Great forum - glad I found it. I have a 2002 Envoy that's just started giving me a problem that is giving me a headache. Twice the SES light has come on and the trouble code is P1345 (camshaft/crankshaft timing). The problem is, though, that there has never been any driveability problem - no...
www.trailvoy.com www.trailvoy.com
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chem_man
Also, what other DTCs are present when you connect a code reader to the OBDII port? This is very important!
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