Red Hot Cat, Misfires, Running Rich - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 17 (permalink) Old 11-20-2008, 04:57 PM Thread Starter
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Angry Red Hot Cat, Misfires, Running Rich

I really need to spend more time on here. I feel bad for always asking, but not answering anyone elses problems. But again... I have a problem.

Yesterday morning it was probably 30F, and when I tried starting my car it would just crank but no run. Four tries later it starts but runs like shit. Tried it again, started but again, ran like shit. The day before it ran like a dream no signs of it hiccuping. Redid my timing chain 1000 miles ago since one of the cams (don't know which) were a couple teeth retarded, and my car got its balls back.

Symptoms:
-The tach show the rpm barely fluctuating.
-It doesn't idle worth shit.
-Acceleration is a joke, 0-30 in 30 seconds.
-It would seem its running lean, but its really running really rich.
-I got a P0300 (Random Misfire) that is it.
-And now my catalytic converter is glowing cherry red now.

Anyways changed spark plugs & the coil pack so far. No dice. Well I'm at my stepdads garage trying to diagnose it, so any help in the mean time would be appreciated.

Other Possibilities:
Fuel Injectors Leaking/Stuck Open?
Bad Fuel Regulator
Is there a cold start valve?
EVAP or PCV stuck open.

Any other ideas? Thanks.

2006 Chevrolet Cobalt LT
2.2L MPI DOHC

my balt gots alot of baggage, but for some reason I still love her.

So far I've had 15 Tickets, 4 Warnings / 3 years of driving.
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post #2 of 17 (permalink) Old 11-20-2008, 06:09 PM
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Burning hot Cat would lead me to believe a extreme rich condition, unburned gas in the cat heating up. Check Fuel pressure regulator, compression on all 4 cylinders, Make sure you are firing on all 4 cylinders (even though you replaced the plugs etc.) you may not be getting fire to one of the cylinders. Pull the plugs after it runs and see if any are fouled with fuel or any running lean and one that looks normal or semi black. Start small and work your way up.

07' Chevy Cobalt SS - GMPP SRI INTAKE / JET PERFORMANCE MODULE
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post #3 of 17 (permalink) Old 11-20-2008, 06:39 PM Thread Starter
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Well Plug #1 & #4 tips had a heavy black soot. Plug #2 & 3 look decent. Although #3 was cross-threaded before putting in the last plugs, but somehow manage just to retain enough thread for it. Since I took #3 out this time, I have no thread, and my fear right now is if I got metal shavings from the last time crack something. IDK, I got a "fix-a-thread" insert, but I'm more scared that the damage has already been done. I mean it runs that bad. I don't think I have a choice but to remove the head... My ignorance will probably make me retap it. I hate my car, she was cursed from the get-go.

2006 Chevrolet Cobalt LT
2.2L MPI DOHC

my balt gots alot of baggage, but for some reason I still love her.

So far I've had 15 Tickets, 4 Warnings / 3 years of driving.
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post #4 of 17 (permalink) Old 11-20-2008, 07:53 PM Thread Starter
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Well same story for plugs I put in the afternoon. The #1 and #4 plugs are showing that they are running hot, while #2 is clean. So what's up with this? #1 & #4 cylinders run upward in sequence together, but on different strokes. While #2 & #3 run downward in sequence, but different strokes. So -- who am I kidding anyway. I'm still stumped. Nothing but brainfarts.

2006 Chevrolet Cobalt LT
2.2L MPI DOHC

my balt gots alot of baggage, but for some reason I still love her.

So far I've had 15 Tickets, 4 Warnings / 3 years of driving.
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post #5 of 17 (permalink) Old 11-21-2008, 12:04 PM Thread Starter
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Well something leaves me to believe that my vehicle has cracked fuel injectors. My car is consuming 4X the amount of necessary fuel (40mph in 4th gear usually is 45-55mpg; now its only getting ~13mpg). '06 Cobalt 2.2 & my VIN falls in the effected category of that Fuel Injector Recall. Sounds like this is the problem?

2006 Chevrolet Cobalt LT
2.2L MPI DOHC

my balt gots alot of baggage, but for some reason I still love her.

So far I've had 15 Tickets, 4 Warnings / 3 years of driving.
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post #6 of 17 (permalink) Old 11-21-2008, 05:10 PM
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Been said before but it needs to be repeated....check you ECM for codes! The ECM has a self diagnostic system that will store codes to help identify the problem. Without them all we can do over the internet is give "shots in the dark".

Had a similar problem on a Buick -- cherry red hot exhaust headers (factory headers) -- turned out to be the MAF. Again this was on that Buick -- may not be the same on the Cobalt.

Get a code reader ~ $60 -$100.

Ex-Cobalt Owner
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post #7 of 17 (permalink) Old 11-21-2008, 06:15 PM
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Quote:
Originally Posted by threedagreez View Post
-I got a P0300 (Random Misfire)

wouldnt that be the code?
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post #8 of 17 (permalink) Old 11-21-2008, 07:31 PM
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I would check for spark on all 4 cylinders and make sure they are all equal and a strong blue spark. Second, I would do a compression test on all four cylinders. If you have good spark and compression than go test the fuel injectors. Make sure 2&3 are actually dumping fuel or not. A scanner would be the best bet right now to watch the MAF, TPS, Cylinders 1-4, and see if the O2 sensor is working correctly. You need to verify the problem by starting from point A to point B. The basics are essential before you jump to conclusions. Verify spark to the plugs, compression in cylinders, correct fuel out of each injector, proper MAF, TPS, O2 sensor readings. The O2 sensor will tell ALOT if you know what you are looking at using a scanner.

07' Chevy Cobalt SS - GMPP SRI INTAKE / JET PERFORMANCE MODULE
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post #9 of 17 (permalink) Old 11-22-2008, 07:22 AM
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DTC P0300 -- Condition for setting a P0300: The ECM is detecting a crankshaft rotation speed variation indicating a misfire sufficient to cause emission levels to exceed mandated standards.

Check for other codes TOO! If it is ignition related there would/could be additional codes.

It does not have to be an ignition problem to set this code.
Check:
vacuum hoses (brake booster for example)
crankcase ventilation system (hose from VC to intake, PCV hole inside intake manifold)
wiring grounds, loose connections
Exhaust system restrictions (Cat clear?)
Fuel contaminants (alcohol can set it - any chance you ran E85 in it?)

One of the first steps in diagnosing this problem (according to the factory service manual) is to accomplish a crankshaft position system variation learn procedure -- best done by a technician with the right tools.

Service manual (06 cobalt, vol 2, page 6-1562 - 2.2L): P0300 Diagnostic Aids. You must perform the CKP system variation learn procedure before proceeding with this diagnostic table. Did your dealer do this?

Ex-Cobalt Owner
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post #10 of 17 (permalink) Old 11-22-2008, 03:23 PM
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Exhaust system restrictions (Cat clear?)

I agree with that statement ... if you read my prior post if you know what you are looking for using a scan tool than the O2 sensors can tell you alot. I believe there is one before the cat and one after the cat. You need to watch these BOTH!

Also follow what RED07SSNA said as well. He's right on with the code!

07' Chevy Cobalt SS - GMPP SRI INTAKE / JET PERFORMANCE MODULE
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