Changed plugs now won't run

Boog2006

Original poster
Member
Dec 3, 2011
151
Need some help!

2006 Trailblazer 4.2 137,xxx miles was throwing P0300 and P0304 codes, just changed plugs with new 41-103s and now it won't run. Cylinder one an 4 showed significant corrosion.

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[video=youtube;yzQrgslvaNE]http://www.youtube.com/watch?v=yzQrgslvaNE[/video]
 

triz

Member
Apr 22, 2013
746
Check the spark plug closest to the fan. I had it where the coil pack was not connected correctly because of the plastic trim piece.
 

Boog2006

Original poster
Member
Dec 3, 2011
151
triz said:
Check the spark plug closest to the fan. I had it where the coil pack was not connected correctly because of the plastic trim piece.

Will do thx

I'm headed to get a coil pack now to troubleshoot with...
 

Boog2006

Original poster
Member
Dec 3, 2011
151
Ok still need some help. Ditched coil pack four with a new coil...no change

Switched coil 1 with old coil 4 no change...when the engine died this time it actually puffed a little bit of what looked like blue smoke out the throttle body.
 

Boog2006

Original poster
Member
Dec 3, 2011
151
Ok put the intake resonator on and the truck runs...but idling at 800 -900 rpm...ideas thoughts?
 

triz

Member
Apr 22, 2013
746
Didn't mean for you to go get a new one what I meant was to make sure that it was seated properly. Did you have the battery disconnected? It might just be going thru a relearn.
 

MAY03LT

Member
Nov 18, 2011
3,422
Delmarva
Is the vac hose under the resonator that connects to the valve cover connected on both ends?
 

Boog2006

Original poster
Member
Dec 3, 2011
151
Here's what I found after thinking about your video. 2006 is different based on the location of the maf sensor...I put the intake resonator back on and the truck runs fine
 

Boog2006

Original poster
Member
Dec 3, 2011
151
triz said:
Didn't mean for you to go get a new one what I meant was to make sure that it was seated properly. Did you have the battery disconnected? It might just be going thru a relearn.

Yeah I understand...I was thinking since I still had a miss I might have a coil bad anyway...I checked it before I installed the new one.
 

xtitan1

Member
Jun 5, 2013
467
Boog2006 said:
Here's what I found after thinking about your video. 2006 is different based on the location of the maf sensor...I put the intake resonator back on and the truck runs fine

Wait so you're saying you were having problems because you didn't put the MAF back at first? Then when you put the resonator on, you put the MAF on, and therefore it works?
 

Boog2006

Original poster
Member
Dec 3, 2011
151
Nope...never UN hooked the MAF just removed the resonator...this pick shows how I was trying to run it.
View attachment 28847
 

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seanpooh

Member
Jan 24, 2012
461
I would disconnect the battery to reset the PCM and clean the throttle body out. I bet your PCM memory has the adjustments/advancements for those rusty spark plugs.

Also those new spark plugs were pre gapped right?

And just a tip even though I'm not familiar with the redesigned coilpacks; if there is a gasket on those coil packs, get some gasket maker and apply it so water doesn't leak down into the plugs again. I had a slight corrosion on the outside of the spark plugs but never on the inside.
 

CaptainXL

Member
Dec 4, 2011
2,445
Boog2006 said:
Need some help!

2006 Trailblazer 4.2 137,xxx miles was throwing P0300 and P0304 codes, just changed plugs with new 41-103s and now it won't run. Cylinder one an 4 showed significant corrosion.

Attachment:
file.php

Definitely had water down 1 and 4 spark plug wells. Notice the rust. You should replace the coils on those cylinders if they are in rough shape and keep misfiring or test bad. Misfiring like that will damage them
 

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