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Old 03-25-2013, 09:31 AM   #1
cody.carr
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Looking for some help

Since the guys over on cobaltss.net are dicks and dont like to help people, id figure id post this here.

I was driving along and the car started to shudder while i was doing ~80 mph, I got to my house, turned the car off, went inside for about 20 minutes, then came back out and tried to start the car and it started, but died immediatly after. It did this for about 20 minutes, then i changed the fuel pump relay and it started back up and decieded to run, but it is still hesitating and is running rich. around 10.5-10.9 on my wideband. before this happened it was running around 11.6-12.2. I have been thinking it is spark plugs, a bad injector, or the pump itself is going bad. It also shudders now during acceleration, WOT and at full boost, 15 psi. It has 60 lb injectors, zzp 2.5" intake, custom exhaust, and a zzp FMHE. Its a 2005 cobalt ss/sc


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Old 03-25-2013, 09:54 AM   #2
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You must have a tune installed , datalog and see whats happening

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Old 03-25-2013, 09:57 AM   #3
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I'm not familiar with cobalts... BUT
That sounds like my issue... Things to check are, MAF, Coil Pack, plugs, wires, bad ground, and ultimately maybe fuel pump...

Any codes? Cel?





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Old 03-25-2013, 11:59 AM   #4
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I did have one. I already cleared it and couldnt remember what it was. I changed my plugs, checked my coils, cleaned the MAF, changed out a torn silicone intake coupler, new air filter, cleaning my TB today, next time the tank gets to empty, im gonna drop it and check the wiring.

Tom, would you happen to know any companies putting out tunes for the cobalts? All i can find is the HP tuners things where you tune yourself, and i dont wanna get into that.
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Old 03-25-2013, 05:51 PM   #5
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Did you check SCT or diablosport

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Old 03-25-2013, 06:20 PM   #6
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Sounds like an O2 sensor or a bad coil/wire/plug.
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