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PostPosted: Mon Nov 26, 2018 12:25 am 
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Year and Trim: 2000 SSEI Bonn
2002 GTP Grand Prix
1978 GMC JIMMY
Having an issue with my 2005 GXP. After not driving the vehicle for about a month I jumped in one a cold day and started the car. The check engine light came on and was flashing.

I took it to O'Reilys and had it read which came back as a P0300 random misfire. I searched this forum for any reference to that code and decided to visually inspect all my coils and plugs.

I have pulled all the front coils, blew compressed air in the spark plug wells to remove any debris which there tended to be enough to be concerning. I visually inspected the coils and saw nothing suspect. I then pulled the plugs and saw all where white which I believe means the car was running hot.

I pulled the back coils off (fun times) and blew compressed air down the spark plug wells. The backs were free of debris but...the second well from the right (not sure of the cylinder #) had water spray out. It looked clear cause it splashed clear on my mirror and it was enough to know it was not from the compressor. It wiped off easily (not sticky/oily like antifreeze).

I am hoping the last time I washed the engine I got water in there indirectly which caused the P0300 code. I am pulling the plugs on the back wall and will replace all plugs.

It's funny, as sealed as the coils seem, there was a lot of debris down in those spark plug wells to make in shudder at the thought.

Will followup tomorrow.


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PostPosted: Mon Nov 26, 2018 1:16 pm 
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Location: CHICAGO
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There is a little rubber grommet/seal that may not have been replaced or was worn that allowed water down there.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

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2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Mon Nov 26, 2018 7:01 pm 
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Year and Trim: 2000 SSEI Bonn
2002 GTP Grand Prix
1978 GMC JIMMY
Had the battery checked and it was good, charged it overnight (they said it was needed), finished pulling the plugs, the back ones were different in that they were not white but slightly brown. 3 out of 4 plugs had slight moisture on the threads. I used a hair dryer as best I could to air out the wells, Put new AC Delco plugs in gapped to 0.050, reinstalled the coils and buttoned the car back up and no change in performance. Code is still P0300 random misfire.

I keep going back to the item that the car was running great then it sat for about a month (had a few below freezing days) and now this immediate issue upon startup.

It has a poor idle and upon acceleration on occasion it will clean up and run good as its shifting and then starting out from the next traffic light it will dog and not shift properly like 3 seconds at high RPM then it will shift (like the gas pedal stopped working) with a very long high RPM run before shifting.

The moisture/water in the wells is concerning. And I did not notice any of the coils having a gasket or O ring. They fit snug going down the wells but there was only a hard plastic to metal seal on all of them.


Lastly there is noticable white chalky substance on my back bumper near the exhust. It's acidic in smell. Not sure if I am hoping against hope on it being a manifold gasket issue. Does anyone have another idea on how to trouble shoot the issue? Any help would be greatly appreciated.


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PostPosted: Tue Nov 27, 2018 2:08 pm 
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Location: Central Illinois
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Is it using any coolant?

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PostPosted: Tue Nov 27, 2018 8:56 pm 
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Location: CHICAGO
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Again, I ask if there were any of these rubber grommets around the coil stem, that mounts between the aluminum bracket the coils mount on and the cam cover;

The green "o" ring
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_________________
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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2015 Chrysler Town & Country Limited Platinum: Mommy's NEW RGC
2007 Chrysler Town & Country Limited: Daddy's beater affectionately called the Rolling Garbage Can or "RGC" for short
2009 Pontiac G8 GT: L76, Sport Red Metallic
2009 Chevrolet Impala SS: LS4 V8, Victory Red
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck


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PostPosted: Wed Nov 28, 2018 6:35 am 
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Joined: Sat May 31, 2008 7:22 am
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Year and Trim: 2000 SSEI Bonn
2002 GTP Grand Prix
1978 GMC JIMMY
J Wikoff wrote:
Is it using any coolant?


Nothing abnormally as far as I could tell. I had "topped off" the coolant a few weeks before I let the car sit for a month.


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PostPosted: Wed Nov 28, 2018 6:38 am 
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Year and Trim: 2000 SSEI Bonn
2002 GTP Grand Prix
1978 GMC JIMMY
CMNTMXR57 wrote:
Again, I ask if there were any of these rubber grommets around the coil stem, that mounts between the aluminum bracket the coils mount on and the cam cover;

The green "o" ring
Image


I will have to pull and look. I individually removed the coils leaving the aluminum tray in place. I will specifically look tonight.


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PostPosted: Tue Dec 11, 2018 1:45 pm 
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Year and Trim: 2000 SSEI Bonn
2002 GTP Grand Prix
1978 GMC JIMMY
Took it to a Chevy dealer for an evaluation. They said it passed the head gasket test but they think it is a head gasket issue.
Gave me a $4500 estimate to instal a used motor. I asked if it had the stud insert kit our just standard OEM studs and he said he had no idea but assumed the OEM.


So now I am shopping around for a garage that will just drop the engine for me then re-install.


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