MAF codes, lack of boost, help!
10-28-2012, 05:58 PM
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MAF codes, lack of boost, help!
Hi, 2009 cobalt ss turbo, injen cai, magnaflow exhaust . no tune. had car fluttering boost, sounded like bov stuck open, brought to dealer, got new turbo put on, still same issue, poped p2178 and p0103 at first a few times, then now they stopped coming up few days ago and now i got p0101. wondering whats my options.
10-28-2012, 06:22 PM
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GM said they tried a new maf and still had same issue and put my maf back in. then put new turbo on it. nice to get a new turbo out of it but still not fixxing the problem. i checked for boost leaks and checked all hoses, dont seem to be issue. with out an osciloscope is it possible to check my maf for proper function?
10-28-2012, 06:24 PM
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multimeter to check voltages? im not sure what it would supposed to be reading on the cobalts.
do you have an A/F gauge? im wondering if your running lean/rich
did the deealer check the tune?
check your intercooler for cracks read thats an issue on the ss/tc
check your Oxygen sensors
do you have an A/F gauge? im wondering if your running lean/rich
did the deealer check the tune?
check your intercooler for cracks read thats an issue on the ss/tc
check your Oxygen sensors
10-28-2012, 07:06 PM
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i have no tune on the car that im aware of, i contacted previous owner and am in the process of checking if there was at some point and may have been lost. dont have a/f gauge and can not see fuel trims, which makes this hard to diagnose. dont really want to bring to dealer to pay retail out for something i can just end up spending money a tune or a scan tool to read my datalogs. with an untuned ingen u think it will cause troubles?
10-28-2012, 08:04 PM
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ok, well if i can borrow a friends genesis scan tool and i can monitor my a/f what should i be looking for? I also wonder why i never had no problems with this for 3-4months and now its starting to do it every day
10-28-2012, 08:17 PM
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that is strange...but i would get tuned for the intake and that should help a lot. search on here, things like intake and downpipe especially will cause the car to not run right
10-28-2012, 08:38 PM
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yeah but why would i get the code contently now when i never changed anything and it just started to come up? possible colder air outside this time of year?
10-29-2012, 06:25 AM
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checked maf wiring back to were it connects into the thicker harness. no chafe,pinch. i heard storys of a bank 1, 1 o2 sensor cauing havic, anychance?
11-02-2012, 06:07 PM
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See my sig for boost leak test. You absolutely must be able to perform a boost leak test if you're going to own a turbo-car. Likely, you have a leak, and need to find it. What were you doing right before this started happening? Did you let off after a full-throttle/full-boost romp and hear a pop? Did you bottom out the front of the car at all? Need details.
11-03-2012, 04:11 PM
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11-06-2012, 01:54 PM
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i had injen intake on my car untuned for 4000 miles no problem, so i doubt thats an issue.i actually had charge pipe (hot and cold side) intake and intercooler with no tune for that about 4000 miles with absolutely no problem what so ever. i had the same problem with my car and it was the lower charge pipe sensor, once it is takin out it is hard to get back in with out stripping it out, so id make sure that it is pushed all the way in and seated properly and also check to make sure it didnt come unplugged somehow . thats what my problem was and i was thowing the same codes.
11-10-2012, 02:40 PM
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Made a boost leak tester today. No leak found. Holds pressure. Ill have to start back probing sensors and check them next I guess. Any other suggestions before I try the tune.
11-10-2012, 02:54 PM
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Count me super-surprised, then. I'd run the boost leak test again with the bumper cover off so you can be sure you're not leaking around the intercooler area, but if you're absolutely sure you don't have leak, try another TMAP sensor. You might just be better off taking it in if it's repeatable all the time. Dealers love to throw ECM's and MAF sensors at these codes.
11-10-2012, 04:03 PM
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Count me super-surprised, then. I'd run the boost leak test again with the bumper cover off so you can be sure you're not leaking around the intercooler area, but if you're absolutely sure you don't have leak, try another TMAP sensor. You might just be better off taking it in if it's repeatable all the time. Dealers love to throw ECM's and MAF sensors at these codes.