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Old 09-25-2009, 04:07 PM
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Default Oh joy, P0401 is back... (and how 80's fail emissions)

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:
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Old 09-25-2009, 04:12 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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Old 09-25-2009, 04:23 PM
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Is the EGR sensor that 14mm nut deal on the top of the intake manifold? the one that was a real bugger to break free?
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Old 09-25-2009, 04:27 PM
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Is the EGR sensor that 14mm nut deal on the top of the intake manifold? the one that was a real bugger to break free?
Yup.....thats the one.
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Old 09-25-2009, 05:03 PM
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Default P401

On my 80 I occasionally got the code on Scan Gage. It seemed to happen after I had been driving a while and stopped for a short time then restarted the engine. After a few minutes of highway driving I would get the code. I would reset it and the problem would not reappear for some time, like months. So I did not worry about it and it did not seem to be a problem. T
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Old 09-25-2009, 05:40 PM
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An 02 sensor would pop another code on its own, but could it contribute to the P0401?

Ialso am still running Rick's MAF with the vacuum line hooked up
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Old 09-26-2009, 07:49 AM
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Mine disappeared this summer after being on for 18 months?
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Old 09-26-2009, 10:22 AM
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Your solieniod was fried (no current could pass through it to pull the valve shut).
That is what I replaced last time for you. If the code comes on again. I can give you suggestions or I can come look at it and see if my work mess up.
Let me know.
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Old 09-26-2009, 02:40 PM
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Code's what are these thing's you all are talkng about, NEW 80 OWNER hehe..
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Old 09-26-2009, 06:45 PM
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Ok so I cleaned up the EGR sensor thing, I guess it looked dirty but it didn't look that bad. Anyway, still no return of the code, though last time it only would happen on longer trips.


Kevin you'll know soon enough, eh.
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