From: Pete C. on

"Steve W." wrote:
>
> aarcuda69062 wrote:
> > In article <1Gxgk.33463$ZE5.8416(a)nlpi061.nbdc.sbc.com>,
> > "W. Stief" <none(a)sbcglobal.net> 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.
> >> How are your brakes working?
> >
> > Why would his brakes cause a 2 lean trouble codes?
>
> Vacuum leak through the booster?

1T dually - Hydroboost.
From: aarcuda69062 on
In article <4vIgk.15801$mh5.4782(a)nlpi067.nbdc.sbc.com>,
"Pete C." <aux3.DOH.4(a)snet.net> wrote:

> "Steve W." wrote:
> >
> > aarcuda69062 wrote:
> > > In article <1Gxgk.33463$ZE5.8416(a)nlpi061.nbdc.sbc.com>,
> > > "W. Stief" <none(a)sbcglobal.net> 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.
> > >> How are your brakes working?
> > >
> > > Why would his brakes cause a 2 lean trouble codes?
> >
> > Vacuum leak through the booster?
>
> 1T dually - Hydroboost.

The devil is in the details.
From: Steve W. on
aarcuda69062 wrote:
> In article <4vIgk.15801$mh5.4782(a)nlpi067.nbdc.sbc.com>,
> "Pete C." <aux3.DOH.4(a)snet.net> wrote:
>
>> "Steve W." wrote:
>>> aarcuda69062 wrote:
>>>> In article <1Gxgk.33463$ZE5.8416(a)nlpi061.nbdc.sbc.com>,
>>>> "W. Stief" <none(a)sbcglobal.net> 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.
>>>>> How are your brakes working?
>>>> Why would his brakes cause a 2 lean trouble codes?
>>> Vacuum leak through the booster?
>> 1T dually - Hydroboost.
>
> The devil is in the details.

True, Scratch the booster leak.

--
Steve W.
From: Pete C. on

"Steve W." wrote:
>
> aarcuda69062 wrote:
> > In article <4vIgk.15801$mh5.4782(a)nlpi067.nbdc.sbc.com>,
> > "Pete C." <aux3.DOH.4(a)snet.net> wrote:
> >
> >> "Steve W." wrote:
> >>> aarcuda69062 wrote:
> >>>> In article <1Gxgk.33463$ZE5.8416(a)nlpi061.nbdc.sbc.com>,
> >>>> "W. Stief" <none(a)sbcglobal.net> 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.
> >>>>> How are your brakes working?
> >>>> Why would his brakes cause a 2 lean trouble codes?
> >>> Vacuum leak through the booster?
> >> 1T dually - Hydroboost.
> >
> > The devil is in the details.
>
> True, Scratch the booster leak.

Not really much for vacuum lines on this truck, since it has hydroboost
and they long since stopped using vacuum actuators for stuff like HVAC.

I did find another issue when farting around with it yesterday. While
the engine was idling I pulled the fuel pump relay and to my surprise
watched the fuel pressure slowly drop until the engine died. Seems that
the fuel pump oil pressure switch isn't doing it's thing. The oil
pressure gauge reads normally and it's a combined switch / sensor unit,
so presumably the oil pressure is fine. There doesn't seem to be an easy
way to connect a direct pressure gauge to validate. I need to connect a
meter to the wiring near the fuel pump and see if it's suffering a
voltage drop under load due to perhaps burned relay contacts.

I also disco'd the fuel filter and checked it yesterday. The fuel filter
flowed freely, so it was reinstalled when I was done (did have another
filter on hand). While it was out I connected a hose to the supply side
line and ran it into a gas can. I put my manual switch in place of the
fuel pump relay and powered it up and it seemed to pump more than enough
volume.
From: mr158912 on
i am assuming you have some sort of data screen available while it is running and
the scanner is hooked up spray the intake with carb cleaner and watch the long term
fuel trim
see if it changes while you are spraying carb cleaner on intake and related parts
do you have a mysterious coolant leak
level goes done but never see any under vehicle?? if yes to that question then you
do have a intake leaking

"Pete C." wrote:

> "Steve W." wrote:
> >
> > aarcuda69062 wrote:
> > > In article <4vIgk.15801$mh5.4782(a)nlpi067.nbdc.sbc.com>,
> > > "Pete C." <aux3.DOH.4(a)snet.net> wrote:
> > >
> > >> "Steve W." wrote:
> > >>> aarcuda69062 wrote:
> > >>>> In article <1Gxgk.33463$ZE5.8416(a)nlpi061.nbdc.sbc.com>,
> > >>>> "W. Stief" <none(a)sbcglobal.net> 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.
> > >>>>> How are your brakes working?
> > >>>> Why would his brakes cause a 2 lean trouble codes?
> > >>> Vacuum leak through the booster?
> > >> 1T dually - Hydroboost.
> > >
> > > The devil is in the details.
> >
> > True, Scratch the booster leak.
>
> Not really much for vacuum lines on this truck, since it has hydroboost
> and they long since stopped using vacuum actuators for stuff like HVAC.
>
> I did find another issue when farting around with it yesterday. While
> the engine was idling I pulled the fuel pump relay and to my surprise
> watched the fuel pressure slowly drop until the engine died. Seems that
> the fuel pump oil pressure switch isn't doing it's thing. The oil
> pressure gauge reads normally and it's a combined switch / sensor unit,
> so presumably the oil pressure is fine. There doesn't seem to be an easy
> way to connect a direct pressure gauge to validate. I need to connect a
> meter to the wiring near the fuel pump and see if it's suffering a
> voltage drop under load due to perhaps burned relay contacts.
>
> I also disco'd the fuel filter and checked it yesterday. The fuel filter
> flowed freely, so it was reinstalled when I was done (did have another
> filter on hand). While it was out I connected a hose to the supply side
> line and ran it into a gas can. I put my manual switch in place of the
> fuel pump relay and powered it up and it seemed to pump more than enough
> volume.