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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-28-2017, 05:27 PM
kparker kparker is offline
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2007 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Dec 2017
Location: robinson, il
Posts: 3
help me with this p.o.s

alright so my 07 trailblazer 4.2 WILL NOT STAY RUNNING IN COLD WEATHER!
i have cleaned the throttle body multiple times(dont suggest this i could eat out of it)
i have changed the cam position sensor
i have changed all plugs with iridium ones
when this all first started i put the code scanner on it and got misfire on cylinder 6 plus a bunch of other codes. so i figured it was plugs or a coil. i changed the plugs and switched the #6 coil to #5 and retested after doing this i now have multiple misfires. i have re snugged every plug and coil up so its not a lose connection. im about to try and change the vvt actuator tomorrow. another code says fuel is too lean in bank #1.

Could this possibly be an intake manifold gasket?

do i need to park it and trade it in when warm weather arrives?\
im about done with her it has 215k and has been a great car but its p**sing me off now/
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  #2  
Old 12-28-2017, 08:11 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 1,736
Loose intake manifold bolts can cause lean running. Also check to make sure the vacuum hose is connected to the fuel pressure regulator. Check fuel pressure at fuel rail. A compression test should also be performed. If you have a scan tool, check the intake air temperature.
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  #3  
Old 12-29-2017, 01:07 AM
Dually4by Dually4by is offline
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2006 Chevy TrailBlazer LT
Blue and Silver two tone 5.3L V8 4X4
Join Date: Aug 2017
Location: Northeastern, CO
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I had that code too lean on fuel bank #1. Come to find out, I replaced the fuel filter and the code went away.
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  #4  
Old 01-03-2018, 09:41 AM
kparker kparker is offline
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2007 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Dec 2017
Location: robinson, il
Posts: 3
i dont have a serviceable fuel filter mines an 07.
im going to check the manifold bolts today.
I have it in my shop ill put it back on the scanner and give you guys some data.
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  #5  
Old 01-03-2018, 12:36 PM
kparker kparker is offline
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2007 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Dec 2017
Location: robinson, il
Posts: 3
update had my mechanic at work look at the codes. said intake manifold gaskets need replaced. luckily i get a break on price....$200 on friday lets see what happens.
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  #6  
Old 02-17-2018, 08:10 AM
princej99 princej99 is offline
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2008 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jan 2018
Location: ont
Posts: 290
was the manifold gaskets the problem?

what ended up being the issue or issues? and hopefully they are now resolved.

either way, please update us.

PrinceJ
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