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Old 09-25-2009, 05:12 PM
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Originally Posted by nakman View Post
So on Wednesday night driving home my CEL came on. Pulled the code last night and yup, PO401. so I cleared it, driving the 80 again today and it hasn't come back on yet.

I have 2 theories: one is I am pretty sure I've got an exhaust leak, maybe multiple. Occasionally when I start the truck I can hear something rattle.. I can also get it to rattle at various RPM's, like power breaking while wheeling I can get it to rattle pretty good... second theory is the second guessing of the Landtank MAF mod... which has been in place for about 10,000 miles now.

I can't remember what all got replaced when I had 401 last time, I think the IAC valve? Maybe remembers... anyway I'm not going to do anything until the light comes on again, but am open to any peanut gallery comments in the interim. :popcorn:

The leak is most likely the crotch of the Y pipe. The valve Robbie replaced is the EGR vacuum control solenoid. I have not popped a 401 since I replaced mine and I too am running Ricks MAS (happily) You might check the EGR sensor for crud build up.
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Originally Posted by Jacket View Post
Welcome. Lots of "northsiders" here in the club. We're known to have some of the strongest, coolest and most awesome club members.
Originally Posted by Red_Chili View Post
Cruisers are superior
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