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Old 08-30-2012, 06:04 PM   #1
jhubbz
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P0172 and chugging

Ok, So every once in a while I will get a p0440, which I've always just cleared, because I never thought it was a huge deal. For the last couple weeks, when I hit the gas, it won't go right away, but at about 15% throttle, it will finally jump in. I read ion's thread about a sticky throttle plate, which made me check mine, but that wasn't the problem.

A couple days ago, my Trac off light came on while I was on the highway and my Ultragauge immediately threw a P0172 at me (System too rich). It went off after a day, but I wouldn't be surprised if it came back.

Just checked my spark plugs and they look fine.

Of note: I have MSD coils and a 2.4 with a CAI.

Anyone know what the problem could be? I'm thinking my cat is really starting to clog, causing backpressure, but would like some input.
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Old 08-31-2012, 07:09 AM   #2
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Could be a clogging cat. could also be an 02 sensor going out.
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Old 08-31-2012, 12:16 PM   #3
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Id clean your maf sensor first, before you go paying for a new cat
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Old 08-31-2012, 01:36 PM   #4
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Quote:
Originally Posted by xXManwhoreXx View Post
Id clean your maf sensor first, before you go paying for a new cat

I have a 2.4, no maf. I have an iat but it's fine
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Old 09-02-2012, 11:08 AM   #5
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I think I might have found part of the problem. Rotten vac line. Went to Murray's and picked up a new one and seems to be running better. Not 100% tho. Hopefully it solves my intermittent p0440 issue. Pics of rotten hose, which connects the Intake manifold to what I'm guessing is a feedback gauge on the TB.





I gave Tuffy a call and they said they could replace my CAT for $225, so I'm going to wait a couple weeks and get that done.
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