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Old 10-28-2009, 03:49 PM   #1
raudermaster
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Misfire problems...

My girl's car has been running like crap lately, and of course, everytime I drive it, it doesn't do what it does for her. It's odd though, this thread: http://www.g6ownersclub.com/forum/showthread.php?t=5286 is somewhat the same we're experiencing, however, her CEL is on now, but I got a PO300 code (random/multiple cylinder misfire.) Now, I know that would most likely be caused by the coils/plugs/wires, but my friend found (not sure where) that I'm not sure is a TSB or not, but said the misfire problem has something to do with the fuel rail being clogged with rust? Has anyone ever heard of that problem? This is what he e-mailed me:

Cylinder Miss On Left Turns And Cylinder 4 Miss On Right Turns - Possible Fuel Contamination - keywords CEL contaminated controls cylinders gas injector intermittent MIL misfire P0300 P0301 rail rust #PIP3333A - (07/12/2007)



Models: 2004-2008 Chevrolet Aveo

2004-2006 Chevrolet Cavalier

2005-2008 Chevrolet Cobalt, Cobalt SS

2006-2008 Chevrolet HHR

2004-2008 Chevrolet Malibu

2007-2008 Pontiac G5

2006-2008 Pontiac G6

2005-2006 Pontiac Pursuit (Canada Only)

2004-2006 Pontiac Sunfire

2003-2008 Pontiac Vibe, Vibe GT

2003-2008 Saturn Ion, Ion Redline

2007-2008 Saturn Aura, Aura Hybrid

2004-2008 Saturn Vue

2007-2008 Saturn Vue Hybrid

with a 4 Cylinder Engine

(RPOs L61, L91, LAT, LE5, LNK, LSJ, LV6, or LXT

Sorry for the long lengthy post, any knowledge will be greatly appreciated. Thank you.
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Old 10-28-2009, 07:16 PM   #2
daygon
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i highly doubt that it's the rust in the fuel rail ... how many miles are on her car?

usually a random misfire indicates a bad coil pack
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Old 10-28-2009, 08:25 PM   #3
raudermaster
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I know, but the fuel rail thing threw me a curveball, that's why I wanted to ask here. Her car has 55k on it. Out of all the years I've been doing work on vehicles, I haven't had to diagnose a bad coil yet. Correct me if I'm wrong, but these are coil on plugs right? How would I be able to tell what one is exactly bad? Would one be discolored?
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Mine:
'03 Marauder - Vortech eqiupped. 450rwhp/410rwtq
'06 F-150 4x4 - 35's with some bolt ons
Hers:
'06 G6 - 4cyl and stock
Ours:
'95 Mustang GT - 347 build underway
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Old 10-28-2009, 10:18 PM   #4
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I just fixed this horrible issue on my car and the oddest thing ever...it turned out after replacing O2 sensors and all that it was the catalytic converter which was clogged up. The "stone" inside was all cracked! Anyways this was found after having some surgery on the rear of engine and removing plugs, coil, head covers and all. This is easier to check if you go to a muffler shop. So try to check that if you can.
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Old 10-29-2009, 06:00 AM   #5
daygon
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Quote:
Originally Posted by raudermaster View Post
I know, but the fuel rail thing threw me a curveball, that's why I wanted to ask here. Her car has 55k on it. Out of all the years I've been doing work on vehicles, I haven't had to diagnose a bad coil yet. Correct me if I'm wrong, but these are coil on plugs right? How would I be able to tell what one is exactly bad? Would one be discolored?
i've never seen rust in the fuel rail at 55k miles ... that's very unlikely.

Plus if it was misfiring because of the rusty fuel rail you would have a code from the o2 sensors saying "running too lean" i think.

no these have one coil pack and wires going to each plug ... if you're replacing the wires then they come as a set of 6 or 4 depends on the motor.

You can take the coil off and take it to autozone and they'll test it for free.

they'll test the primary and secondary resistance. if it's not the coil then try going with the cheaper solution first - new plugs but i don't know what wold be cheaper new wires or new plugs cuz these take iridium plugs which are $8 a piece.

Take the wires off the plug and see if there any burned marks on them any where.

me personally I'd take it somewhere where they'll be able to tell me exactly what the problem is.
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Old 10-29-2009, 04:48 PM   #6
raudermaster
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Thanks for the response guys. My friend has a lift so we'll be putting it up on Sunday and checking the cats. We were also going to check all the ignition things as well and go from there.
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Mine:
'03 Marauder - Vortech eqiupped. 450rwhp/410rwtq
'06 F-150 4x4 - 35's with some bolt ons
Hers:
'06 G6 - 4cyl and stock
Ours:
'95 Mustang GT - 347 build underway
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