Cobalt down
06-19-2011, 10:19 PM
#1
Senior Member
Thread Starter
Cobalt down
Replaced the valve cover and intake manifold with my pretty purple replacements yesterday. Got a new gasket for the valve cover, and re used the one on the intake manifold and throttle body. Everything was put back together nice and tight(from what everyone could tell) but when I went to start it the idle jumped up higher than usual at first(for a split second), then went down to the normal around 1,500k for cat warm up. As soon as it dropped below 1k rpm's and was around 130 degrees it sounded like it had a big cam in it. AFR was around 22 or 23, it also misfired about 60 times, but didn't throw a code. I shut it off pretty quickly because it sounded soooo bad. Pulled out a code reader and it had thrown P0122 and P0223. After checking for leaks, re tightening intake clamps, checking for cracks in the intake itself, checking the lower chargepiping, and unhooking the battery it still idled like ****. This time CEL came on, still the same codes. Had to get it towed to the dealer since it was getting so late. :/
At least it looks nice
vc off, everything checked out fine
I'm hoping it's just the throttle body, it was taken off and when shaken it sounded like something maay have been loose inside(not 100% sure tho). Unfortunately there was no time to take the valve cover and intake manifold off to see if the gaskets were somehow not sealed right. All of the other hoses and sensors were fine, including MAF.
Luckily the tow hook was installed about 5 hours prior, and did it's job when being put on the tow truck
I hope to know exactly what's wrong with it tomorrow. Anyone have any ideas? Also do you think they'll reflash it if they replace the throttle body? I'm screwed because the local guy with HPT moved to New York uuggghh.
HB SS/TC found this useful link that addresses the codes it threw.
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Saaaaaaad
At least it looks nice
vc off, everything checked out fine
I'm hoping it's just the throttle body, it was taken off and when shaken it sounded like something maay have been loose inside(not 100% sure tho). Unfortunately there was no time to take the valve cover and intake manifold off to see if the gaskets were somehow not sealed right. All of the other hoses and sensors were fine, including MAF.
Luckily the tow hook was installed about 5 hours prior, and did it's job when being put on the tow truck
I hope to know exactly what's wrong with it tomorrow. Anyone have any ideas? Also do you think they'll reflash it if they replace the throttle body? I'm screwed because the local guy with HPT moved to New York uuggghh.HB SS/TC found this useful link that addresses the codes it threw.
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Saaaaaaad
Last edited by Rissa; 06-19-2011 at 10:25 PM.
06-19-2011, 10:22 PM
#3
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Poor Rissa. I really hope that they diagnose the problem and Spencer is out on the road again. The powder coated parts look REALLY great at least...
I really hope that they diagnose the problem and Spencer is out on the road again. The powder coated parts look REALLY great at least...
Last edited by ssweeet; 06-19-2011 at 10:22 PM. Reason: Automerged Doublepost
06-19-2011, 10:23 PM
#4
sounds like an air leak, the sensors are hard to put back into the inlet manifold right and the tb is hard to reach and install...sorry for your trouble. tow hook worked great, colors look awesome....
Oh and did you transfer the plastic pcv sleeve out of your im into the new one? I should have mentioned that specifically to you, it is covered elsewhere in installs. I frankly thought you would get this done at the dealer...
Oh and did you transfer the plastic pcv sleeve out of your im into the new one? I should have mentioned that specifically to you, it is covered elsewhere in installs. I frankly thought you would get this done at the dealer...
06-19-2011, 10:24 PM
#6
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Thread Starter
Yes those little plastic pieces were all transferred over, bumper was taken off so everything was somewhat easy to access. Yeah I didn't want to have to pay for it, but it looks like I will anyway lol.
06-19-2011, 10:27 PM
#9
sounds to me like the most likely culprit is going to either be the intake mani gasket or the new manifold itself. Did they powder coat the flange on the intake mani? With feul trims that lean it has to be a huge vacuum leak somewhere in the system. Typically a bad throttle body wouldnt exhibit those symptoms unless it was leaking from the gasket. A bad maf will also exhibit those sysmtoms. Too bad you didnt have time to monitor the stft's and spray some carb cleaner around all the gaskets. That would have gave you an idea of where to look. And unfortunately the dealer will probably see your tuned as they will have to hook up the tech2 for diagnostics.
06-19-2011, 10:27 PM
#10
Senior Member
Thread Starter
Tried to look for leaks but it was getting late. Ugh :/
We checked it looked ok, same with the MAF sensor.
We checked it looked ok, same with the MAF sensor.
Last edited by Rissa; 06-19-2011 at 10:27 PM. Reason: Automerged Doublepost
06-19-2011, 10:28 PM
#12
Senior Member
Thread Starter
sounds to me like the most likely culprit is going to either be the intake mani gasket or the new manifold itself. Did the powder coat the flange on the intake mani? With few trims that lean it has to be a huge vacuum leak somewhere in the system. Typically a bad throttl body wouldnt exhibit those symptoms unless it was leaking from the gasket. A bad maf will also exhibit those sysmtoms. Too bad you didnt have time to monitor the stft's and spray some carb cleaner around all the gaskets. That would have gave you an idea of where to look. And unfortunately the dealer will probably see your tuned as they will have to hook up the tech2 for diagnostics.
06-19-2011, 10:30 PM
#14
okay good deal. The rocker gaskets I always set in the cover before installing it. Mike got his rocker cover done no problem so I am guessing the IM. Some of the sensors are hard to get in place, the evap one I coat the seal with superlube its so hard to put in to the manifold, and if you tear the seal pushing it in, bad things happen. I am sure a good diagnostic tech will home in on it, and it wont be too much money. sorry for your troubles, your underhood pictures look fanstastic....
06-19-2011, 10:32 PM
#18
Senior Member
Thread Starter
I hope it's something simple...and then when they fix it...they don't hurt the vc or manifold LOL. Correct me if I'm wrong, wouldn't an air leak make it run super rich?
06-19-2011, 10:33 PM
#19
the manifold is 100%, I use new or nearly new take off parts, and all the flange faces are covered for pc and then I use a wurth rotary disc to prep the flanges before shipping. You can actually see some of the non serviced pedestals are cleaned all. All threads needed are chased as well...
06-19-2011, 10:36 PM
#23
Senior Member
Thread Starter
the manifold is 100%, I use new or nearly new take off parts, and all the flange faces are covered for pc and then I use a wurth rotary disc to prep the flanges before shipping. You can actually see some of the non serviced pedestals are cleaned all. All threads needed are chased as well...
Ahh ok got it, makes sense.
Last edited by Rissa; 06-19-2011 at 10:36 PM. Reason: Automerged Doublepost
06-19-2011, 10:36 PM
#24
the manifold is 100%, I use new or nearly new take off parts, and all the flange faces are covered for pc and then I use a wurth rotary disc to prep the flanges before shipping. You can actually see some of the non serviced pedestals are cleaned all. All threads needed are chased as well...