amcglone@sbcglobal.net

I have a 1999 Explorer sport 4.0 SOHC. When it is cold outside (below
50 degrees)and the car sat overnight or sat for several hours it
wouldn't idle worth a darn, would rev up real high then sputter then
idle high again, and it would die . It would do this for about 3 or 4
minutes then would idle great. The check engine light was on codes said
bank 1 bank 2 fuel too lean. We changed the following IAC, O2 sensors,
egr valve, air filter, spark plugs,mass air sensor,fuel filter.
We changed the o-rings(gasket) on the intake and it FIXED the problem.
The o-rings are rubber(like a thick rubberband) and when the motor is
cold the the rings were hard and it caused a vaccuum leak, and when the
motor warmed up they loosed back up.
You can purchase these o-rings from the dealer you will need both top
and bottom gaskets
bottom rings run about $11 or $12, and the top gasket is $7 or $8.

 

Fred V.

I wonder if this is the probem with the idle lately on
my 89 Mustang 5.0. I'm having the same problem.

Fred

<amcglone@sbcglobal.net> wrote in message
news:1136056163.107812.210090@g43g2000cwa.googlegroups.com...
>I have a 1999 Explorer sport 4.0 SOHC. When it is cold outside (below
> 50 degrees)and the car sat overnight or sat for several hours it
> wouldn't idle worth a darn, would rev up real high then sputter then
> idle high again, and it would die . It would do this for about 3 or 4
> minutes then would idle great. The check engine light was on codes said
> bank 1 bank 2 fuel too lean. We changed the following IAC, O2 sensors,
> egr valve, air filter, spark plugs,mass air sensor,fuel filter.
> We changed the o-rings(gasket) on the intake and it FIXED the problem.
> The o-rings are rubber(like a thick rubberband) and when the motor is
> cold the the rings were hard and it caused a vaccuum leak, and when the
> motor warmed up they loosed back up.
> You can purchase these o-rings from the dealer you will need both top
> and bottom gaskets
> bottom rings run about $11 or $12, and the top gasket is $7 or $8.
>

Fred V.

Hi group

Found the problem. I took off the hose from the air
cleaner to the throttle body and found
the throttle plate very dirty. After a thorough cleaning the idle went way
up. This was probably from me fooling with the base idle screw over the
years. Then I cleaned the idle air bypass valve (also very dirty but not
stuck). Finally I reset the base idle and TPS voltage. Now the motor purrs
like a kitten!.

Fred
"Fred V." <fredvp@sbcglobal.net> wrote in message
news:C6Xvf.5075$fO5.2816@newssvr33.news.prodigy.com...
>I wonder if this is the probem with the idle lately on
> my 89 Mustang 5.0. I'm having the same problem.
>
> Fred
>
> <amcglone@sbcglobal.net> wrote in message
> news:1136056163.107812.210090@g43g2000cwa.googlegroups.com...
>>I have a 1999 Explorer sport 4.0 SOHC. When it is cold outside (below
>> 50 degrees)and the car sat overnight or sat for several hours it
>> wouldn't idle worth a darn, would rev up real high then sputter then
>> idle high again, and it would die . It would do this for about 3 or 4
>> minutes then would idle great. The check engine light was on codes said
>> bank 1 bank 2 fuel too lean. We changed the following IAC, O2 sensors,
>> egr valve, air filter, spark plugs,mass air sensor,fuel filter.
>> We changed the o-rings(gasket) on the intake and it FIXED the problem.
>> The o-rings are rubber(like a thick rubberband) and when the motor is
>> cold the the rings were hard and it caused a vaccuum leak, and when the
>> motor warmed up they loosed back up.
>> You can purchase these o-rings from the dealer you will need both top
>> and bottom gaskets
>> bottom rings run about $11 or $12, and the top gasket is $7 or $8.
>>
>
>

johanb

You think thats why the sticker states " IDLE NOT ADJUSTABLE"

If you have problems its something else, esp. with newer cars
They trip a CEL when you fart :-)

Engine (idle) problems and no "CEL" is usually dirt related.

IAC, injectors, MAF or t-body dirty

Or combination



"Fred V." <fredvp@sbcglobal.net> wrote in message
news:BJxyf.166$4t3.97@newssvr31.news.prodigy.com...
> Hi group
>
> Found the problem. I took off the hose from the air
> cleaner to the throttle body and found
> the throttle plate very dirty. After a thorough cleaning the idle went way
> up. This was probably from me fooling with the base idle screw over the
> years. Then I cleaned the idle air bypass valve (also very dirty but not
> stuck). Finally I reset the base idle and TPS voltage. Now the motor purrs
> like a kitten!.
>
> Fred
> "Fred V." <fredvp@sbcglobal.net> wrote in message
> news:C6Xvf.5075$fO5.2816@newssvr33.news.prodigy.com...
> >I wonder if this is the probem with the idle lately on
> > my 89 Mustang 5.0. I'm having the same problem.
> >
> > Fred
> >
> > <amcglone@sbcglobal.net> wrote in message
> > news:1136056163.107812.210090@g43g2000cwa.googlegroups.com...
> >>I have a 1999 Explorer sport 4.0 SOHC. When it is cold outside (below
> >> 50 degrees)and the car sat overnight or sat for several hours it
> >> wouldn't idle worth a darn, would rev up real high then sputter then
> >> idle high again, and it would die . It would do this for about 3 or 4
> >> minutes then would idle great. The check engine light was on codes said
> >> bank 1 bank 2 fuel too lean. We changed the following IAC, O2 sensors,
> >> egr valve, air filter, spark plugs,mass air sensor,fuel filter.
> >> We changed the o-rings(gasket) on the intake and it FIXED the problem.
> >> The o-rings are rubber(like a thick rubberband) and when the motor is
> >> cold the the rings were hard and it caused a vaccuum leak, and when the
> >> motor warmed up they loosed back up.
> >> You can purchase these o-rings from the dealer you will need both top
> >> and bottom gaskets
> >> bottom rings run about $11 or $12, and the top gasket is $7 or $8.
> >>
> >
> >
>
>