04 CTS-V throwing codes running rough!!!!!
05-23-2013, 09:11 PM
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04 CTS-V throwing codes running rough!!!!! I just bought a 04 CTS-v under the impression the motor needed to be replaced. The engine was running rough and would die if you let it idle; I got it home run a scan and came up with codes P0101 MAF and P0300 Random / multiple misfire. I drove the car home and it would run decent as long as I kept the RPM's above around 2800 RPM. If it dropped below that it seemed like it would start misfiring worse but I guess its only more noticeable with a low RPM vs high RPM.Is that a reasonable assumption? Any ideas on what could be the cause? I am thinking about changing the MAF and see what happens but I would rather not spend the money if there is a way to clean it or if there may be another issue causing both codes.
Forgot to mention that if am making the engine stay around 1200-1500 RPM I smell a very rich (unburned fuel) exhaust smell if I am just sitting in the driveway.
Forgot to mention that if am making the engine stay around 1200-1500 RPM I smell a very rich (unburned fuel) exhaust smell if I am just sitting in the driveway.
Last edited by av8erdunn; 05-23-2013 at 09:23 PM.
05-24-2013, 05:47 AM
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Well I would start with some MAF (carb) cleaner. Just spray the wires in the sensor. do not touch them. Then some new spark plugs. Could also be a vacume leak causing the whole problem. GOOD LUCK
05-24-2013, 09:40 AM
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They are two difference chemicals.Carb cleaner leaves a solvent behind, CNC MAF Cleaner is proper for electronics.
http://www.crc.co.nz/Automotive-Clea...e9f4d-6782.htm
Here is the composition and MSD full sheet:
http://jr.chemwatch.net/chemgold3/ms...cnz&pwd=vAjbcD
NAME CAS RN %
2-methylpentane 107-83-5 80-90
n-hexane 110-54-3 1-10
naphtha petroleum, heavy, hydrotreated 64742-48-9. 1-10
methanol 67-56-1 <1
carbon dioxide 124-38-9 2-5
VS CARB CLEANER:
Acetone 20 - 30
Toluene 35 - 45
Methanol 25 - 35
Carbon dioxide 5 – 10
basically laquer thinner
05-24-2013, 09:42 AM
#7
The proper test for the MAF would be to FAIL it in the ECM, then start it, unfortunately these are the 5 wire sensors and simply unplugging does throw codes to run VE, but then you also lose your IAT, which is used for VE calculations...
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05-24-2013, 12:01 PM
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So how can I check to see if that's the problem if unplugging it does nothing and I dont have a way to FAIL the MAF in the ECM? Thanks for all your replies.
Last edited by av8erdunn; 05-24-2013 at 12:49 PM.
05-24-2013, 04:43 PM
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Not CARB cleaner. MAF cleaner. - no brackets They are two difference chemicals.
Carb cleaner leaves a solvent behind, CNC MAF Cleaner is proper for electronics.
http://www.crc.co.nz/Automotive-Clea...e9f4d-6782.htm
Here is the composition and MSD full sheet:
http://jr.chemwatch.net/chemgold3/ms...cnz&pwd=vAjbcD
NAME CAS RN %
2-methylpentane 107-83-5 80-90
n-hexane 110-54-3 1-10
naphtha petroleum, heavy, hydrotreated 64742-48-9. 1-10
methanol 67-56-1 <1
carbon dioxide 124-38-9 2-5
VS CARB CLEANER:
Acetone 20 - 30
Toluene 35 - 45
Methanol 25 - 35
Carbon dioxide 5 – 10
basically laquer thinner
They are two difference chemicals.Carb cleaner leaves a solvent behind, CNC MAF Cleaner is proper for electronics.
http://www.crc.co.nz/Automotive-Clea...e9f4d-6782.htm
Here is the composition and MSD full sheet:
http://jr.chemwatch.net/chemgold3/ms...cnz&pwd=vAjbcD
NAME CAS RN %
2-methylpentane 107-83-5 80-90
n-hexane 110-54-3 1-10
naphtha petroleum, heavy, hydrotreated 64742-48-9. 1-10
methanol 67-56-1 <1
carbon dioxide 124-38-9 2-5
VS CARB CLEANER:
Acetone 20 - 30
Toluene 35 - 45
Methanol 25 - 35
Carbon dioxide 5 – 10
basically laquer thinner
Thanks for the info. I have heard of it but never seen it in the stores.
05-24-2013, 09:12 PM
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Tried it and it still runs like crap. I cleaned the Maf with lectro wash but it really didn't need it . It actually threw a few more codes but my wife wouldn't give me time to write them down as we were trying to leave for the holiday. (I'd rather be working on my car but I wouldn't tell her that) I will be back on Tuesday and will play with it more. I left the battery disconnected hoping the codes will clear while gone. Every time I tried to delete the codes using a matco scanner, it wouldn't delete them.
05-27-2013, 03:44 PM
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Well I got home today and connected the battery and started the engine. It ran real rough and I had to keep my foot on it to keep it from dying. As long as I keep the rpms up to 1200 or so it will stay running. If I let off it dies. It finally threw another code but this time it was only the p0101 MAF code . Would a bad MAF cause this problem? I have a feeling if I would have kept it running, it would have eventually thrown the p0300 misfire code but I can't say for sure. I also pulled a couple plugs and tested them and they had good spark. I will pull the others tomorrow to make sure they are good.
05-28-2013, 02:29 PM
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This sounds exactly like my car when it broke a valve spring except I got lean codes on both banks along with the MAF code. Same thing when I tried to delete them. Might be worth pulling a valve cover to take a look.