Good evening I’m looking for some advise I have a 2008 trailblazer four wheel drive 4.2 and it won’t start it cranks over for a few seconds then you hear a little pop out of the exhaust the timing is good it’s all lined up where it needs to be any thoughts thanks
Trailblazer crank no start
- Thread starter John1969
- Start date
Mooseman
Moderator
Mooseman
Moderator
What code exactly? If still getting the same code, it might be a wiring issue. Need to check continuity. Download the manuals from the link in my signature and check the schematics.
Welcome to GMT Nation...
P1345....?
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P1345....?
crankshaft angle corralation advanced
P1345 confirmed any info on how to fix this or what are somethings that cause this code other then the senser. It was on and off and seemed to stay on at same time cruise control stopped working.
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FAQ: Vortec 4.2L I-6
This sticky is for links to the most asked about questions, info, specs and general knowledge of the Vortec 4.2L I-6. If you see a thread that should be considered to be added here, click on the button with a note indicating that it should be added. General Vortec 4200 Wiki (external site)...
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It’s has code p0335 p0355 p0352 everything is working like it should just will not give spark could it be a bad fuse box?
Mooseman
Moderator
Just shooting in the dark here but P0352 and P0355 could be a result of the P0335. So apart from check wiring to the crank sensor, you might not be able to diagnose any further without a high end scanner or scope to check for a crank signal.
So check for voltage and ground at the crank sensor and continuity on the 3rd wire to the PCM.
So check for voltage and ground at the crank sensor and continuity on the 3rd wire to the PCM.
Using a Bright Flash-Light... make a very close examination of all the harnesses and connectors around the PCM and other areas on the Engine and look for any signs of chewed on or damaged wiring caused by rodent activities.
If you find anything sideways... use these Diagrams to confirm the Circuit #, Wiring Insulation Color(s) required and dial in on the Start and Ignition Circuit and Fuel Pump connections first if anything has been destroyed requiring Pairing-Up, Soldering and Insulation using Automotive Shrink Tubing:
If you find anything sideways... use these Diagrams to confirm the Circuit #, Wiring Insulation Color(s) required and dial in on the Start and Ignition Circuit and Fuel Pump connections first if anything has been destroyed requiring Pairing-Up, Soldering and Insulation using Automotive Shrink Tubing:
6716
Member
- Jul 24, 2012
- 822
Your best option may be to supply more information.
Like, how and why do you know that? Is this the last step in an engine swap? Is this your daily driver and it just didn't start one day and you checked the timing? I'm not half the mechanic most of the people here are, but I do a lot of troubleshooting and the sense I get is that there is a strong possibility that the answer is in the information that has not been shared yet.
gmcman
Member
- Dec 12, 2011
- 4,656
I agree, we need to know this. Makes it easier for us to focus our attention.
If you replaced the crank sensor already, it sounds like either an ongoing issue or somethig as a result of.
What did the old sensor look like? Was there crud on the end? How long did the last sensor work for?
Did you swap motors? Short block? If so any discrepancy in model years?
It’s a engine swap the engine that was in there blew up so the old sensor was no good because when the motor let go it took the sensor out also so I purchased a new switch all the timing marks are lined up it’s getting fuel just no spark but it keeps throwing the code crank sensor p0335
the new motor is. 2003. It’s a customers car i put a 2008 motor in my 2002 with no problems at all only thing I had to do was make a longer connector for the ten sensor and that’s it
2003/2002 going into a 2008 are NOT Interchangeable. Someone will chime in why. But you will likely have to pull that motor and start over with the correct motor.
Please see here also..
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07, and likely we could salvage it, but 08.. Not happening per my research here..
Please see here also..
08 TB will no start after engine swap
I put new motor in and I have all grounds connected all plugs plugged In and. I've got fuel but it just will not start I have power to my coils but no spark can anyone help me out ....
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07, and likely we could salvage it, but 08.. Not happening per my research here..
Last edited:
I put a 2008 in my 2002 no problems at all works wonderfully passes smog no check engine light nothing. That’s my personal
A customer brought in a 2008 with a 2003 motor this is the one I’m having trouble with
A customer brought in a 2008 with a 2003 motor this is the one I’m having trouble with
You may have gotten a pre-production motor, making it an 07 in an 08, or something to that effect. But 08 and 09 engine only work in those years, and no other years will interchange with an 08/09.
Yeah maybe your right I just got lucky so The customer is not worried about the smog at all now can I replace the complete wire harness from the 2003 with the 2003 computer as well for it to work
@Mooseman maybe able to help in explaining it more. I am a V8 guy, but have picked up a lot of knowledge while trolling the forums. Its more than the harness. Its also the PCM, and possibly the TCM. Quite a bit more involved. Plus reprogramming, and still not guaranteed to work. Its easier to find the correct motor.
Ok if I can swap the the complete wire harness that’s not a problem I have the complete wire harness pcm Tcm original catalytic converter off the 2003 and everything
Mooseman
Moderator
@TollKeeper is 100% correct.
4.2L interchangeability by years
4.2L Incompatibility by years ('04 engine in '08 truck, no start)
And the '08 motor in the '02 is quite impossible without major issues or a complete rewire. An '07 is possible but it's not completely plug and play. The ignition coils are different and use a different connector, fuel injection rail needs to be retained from the '02 and the coolant temp sensor was moved from near the thermostat on the '02 to the other side and rear of the head on the '07.
4.2L interchangeability by years
4.2L Incompatibility by years ('04 engine in '08 truck, no start)
And the '08 motor in the '02 is quite impossible without major issues or a complete rewire. An '07 is possible but it's not completely plug and play. The ignition coils are different and use a different connector, fuel injection rail needs to be retained from the '02 and the coolant temp sensor was moved from near the thermostat on the '02 to the other side and rear of the head on the '07.
Mooseman
Moderator
And swapping the '03 harness into the '08 would not work due to differences in wiring between the years as well as the newer BCM not recognizing the older PCM. Also, '03 didn't have a separate TCM.
@John1969 , I feel your pain. I want to put a later LS2 V8 in my Envoy, but my wiring only supports a 24x reluctor, and the LS2 supports a 58X reluctor. I can still do it, but it means sending the crank out to a machine shop to do the reluctor swap. Which means its no longer a viable, or cost effective, option. Not even including the DOD refit.
