Author:
Date:
Subject:
Pete C.
2008-07-20 10:05:06
Re: P0171/P0174 Help!
"W. Stief" wrote:
>
> Pete C. wrote:
> > mr158912 wrote:
> >>
> >> it seems to me you have a vacumm leak of some sort either intake
> >> plenium/manifold gsaket or egr valve and maybe evan a pcv system
> >> leak
> >> but looking at your posted data even without o2 data i must ask if
> >> you have a cold air intake kit with a k&n filter the oil from them
> >> plays hell with the maf sensors
> >> i would expect to see a little more maf signal at 1400rpms
> >> mike the days of your kind of repairs and troubleshooting are going
> >> away fast
> >
> > 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.
>
> How are your brakes working?
Seemingly just fine. They are due for service when I find a free weekend
(really when I have the ambition to press out studs), but no indication
of sticking. Last time I put the jack under the truck and tried turning
the wheels by hand there was no apparent drag, which is what I presume
you're getting at. I'll check again when I get a chance a bit later
today.
Author:
Date:
Subject:
Steve Austin
2008-07-20 13:57:05
Re: P0171/P0174 Help!
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.
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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