Re: P0171/P0174 Help!

Pete C.
-boxing@sasktel.net
-Steve W.
--Pete C.
-aarcuda69062
--Pete C.
-mr158912
--Pete C.
-Pete C.
--aarcuda69062
---Pete C.
----aarcuda69062
-----Pete C.
------aarcuda69062
-------Pete C.
--------boxing@sasktel.net
------mr158912
--Mike Romain
---Pete C.
-ben91932
-mr158912
--Pete C.
---W. Stief
----aarcuda69062
-----Steve W.
------Pete C.
-------aarcuda69062
--------Steve W.
---------Pete C.
----------mr158912
----------Pete C.
----------Steve W.
----------Pete C.
----------Pete C.
----Pete C.
---Steve Austin

----Pete C.

Author:
Date:
Subject:

Pete C.
2008-07-20 14:12:52
Re: P0171/P0174 Help!

Steve Austin wrote:
>
> Pete C. wrote:
>
> >
> > Well, I sprayed some B12 around the IM while the engine was idling and
> > didn't note any detectable RPM change. The intake is stock and there is
> > a "normal" filter in place. I did try a K&N filter way back when before
> > deciding it was of no value. That was a long time ago and the MAF has
> > been cleaned with CRC MAF cleaner since then. Another freeze frame had
> > RPM at 2521 and MAF at 7.152 lb/min.
> >
> >
> >
> I'm coming in a little late here, so someone might have already
> mentioned this. Pull the pcv hose off and the breather hose off the
> valve cover and see if the engine is pulling a vacuum in the crankcase.
> Sometimes the intake gaskets fail internally and suck from inside the
> engine.

Good vacuum at the end of the PCV valve when it's pulled out, no vacuum
(or pressure) detectable from the ports in the valve covers.

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