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Old 04-14-2010, 02:29 PM   #11
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I believe that would throw a TCC code would it not?
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Old 04-16-2010, 02:17 PM   #12
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Well the shop just called me and said that its giving them 2 codes....one for the Cat Converter and one for the MAF. The shop said they cleared the codes and have been driving around and haven't been able to get it to mess up, although we know its a matter of time. They said since the Cat Code has been on for awhile that most likely the issues I'm having are from the MAF but they can't tell for sure unless they can get it to act up on them. My initial thought is to replace the MAF and go from there. I wanted to get thoughts on that as well as what the cost of a MAF runs? Thanks guys
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Old 04-16-2010, 05:39 PM   #13
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Usually MAF is either dirty or broken. If it is broken, it will act up with any shock to the vehicle, or even just tapping the box with the handle of a screwdriver. If it is dirty it will usually do it all the time too. Did they give the exact code number?
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Old 04-20-2010, 08:18 AM   #14
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Well here has what has happened since this weekend. The shop told me I needed a new MAF, so I replaced it, only to have the car die 10 minutes after they changed it. So, we took the New MAF out and put the old one back in. Then the shop rewired the Pig Tail that was running to the MAF thinking that electrical wiring could be bad. After driving around for 2 days I've noticed in beginning to mess up again so I don't think this fixed anything. The shop also told me that aftermarket MAF'* sometimes do not work and that I have to get an actual GM MAF???? (Any truth to this?) Either way the shop isn't being able to tell me what is wrong up to this point, they only know I'm getting a CAT Efficient Code and a low MAF Frequency code at this point. Beginning to get very frustrated
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Old 04-20-2010, 08:42 AM   #15
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Ok, maybe you can do the diagnosis that they couldn't, because we can arm you with more info.

Here'* the GM FSM page for P0102, Maf low frequency. It mentions vacuum leaks, etc that could cause the code.
http://gearchatter.com/viewtopic1176...146437e9ea3045

Here'* the P0420 Cat low efficiency code, I wasn't sure as you didn't mention low, but it'* the most common. The interesting thing here is how P0102 can't exist for this code to be set. Which means you are seeing a questionable cat code before the maf. The cat issue may be causing the maf code.
http://gearchatter.com/viewtopic1172...146437e9ea3045
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Old 04-20-2010, 10:47 AM   #16
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Thanks Billboost, when I get home from work later today I'll take a look at this and let you know. I really appreciate the assistance, its frustrating when a shop can't tell you whats wrong with your car!!!!
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