Still having high idle problem on 88 Jeep Comanche (4.0l)

So I'm getting good vacuum using the very imprecise "finger over the hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts. Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some oil in
my air filter as well, and as per these websites, it seems that may be that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring that
oil in the air filter probably isn't helping keep the throttle body really
clean, since the oil can get into the air system from there.

Clint

Well, I got in there with a brush and solvent, and took off some stuff on
the sides (beside the butterfly valve, for lack of the technical phrases).
But it's opening and closing easily, and it's stopping when it hits the
metal stop on the outside of the throttle. But is it perfectly clean? No.
Should I scrub some more?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote

Have you cleaned the throttle body? It's real easy and will eliminate
that
as a source of the problem. Oil in the CCV system doesn't help either,
and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:3IjOh.81737$DN.58716 (AT) pd7urf2no (DOT) ..
So I'm getting good vacuum using the very imprecise "finger over the hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts.
Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and
stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some oil
in
my air filter as well, and as per these websites, it seems that may be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring
that
oil in the air filter probably isn't helping keep the throttle body
really
clean, since the oil can get into the air system from there.

Clint

Scrub till you'd eat from it.

Carl

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote

Well, I got in there with a brush and solvent, and took off some stuff on
the sides (beside the butterfly valve, for lack of the technical phrases).
But it's opening and closing easily, and it's stopping when it hits the
metal stop on the outside of the throttle. But is it perfectly clean?
No. Should I scrub some more?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote in message
news:zfOdnQqMyL_oSpTbnZ2dnUVZ_o-knZ2d (AT) comcast (DOT) com...
Have you cleaned the throttle body? It's real easy and will eliminate
that
as a source of the problem. Oil in the CCV system doesn't help either,
and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:3IjOh.81737$DN.58716 (AT) pd7urf2no (DOT) ..
So I'm getting good vacuum using the very imprecise "finger over the
hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts.
Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and
stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some
oil
in
my air filter as well, and as per these websites, it seems that may be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring
that
oil in the air filter probably isn't helping keep the throttle body
really
clean, since the oil can get into the air system from there.

Clint

Have you cleaned the throttle body? It's real easy and will eliminate that
as a source of the problem. Oil in the CCV system doesn't help either, and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote

So I'm getting good vacuum using the very imprecise "finger over the hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts. Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some oil
in
my air filter as well, and as per these websites, it seems that may be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring that
oil in the air filter probably isn't helping keep the throttle body really
clean, since the oil can get into the air system from there.

Clint

Agreed. The IAC too. (Idle Air Controller). This can get jammed with tiny
amounts of deposits. I would probably use carburetor cleaner.

Earle

"Carl S" <carlsaiyed (AT) REMOVE (DOT) hotmail.com> wrote

Scrub till you'd eat from it.

Carl

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:S5lOh.82165$DN.39493 (AT) pd7urf2no (DOT) ..
Well, I got in there with a brush and solvent, and took off some stuff
on
the sides (beside the butterfly valve, for lack of the technical
phrases).
But it's opening and closing easily, and it's stopping when it hits the
metal stop on the outside of the throttle. But is it perfectly clean?
No. Should I scrub some more?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote in message
news:zfOdnQqMyL_oSpTbnZ2dnUVZ_o-knZ2d (AT) comcast (DOT) com...
Have you cleaned the throttle body? It's real easy and will eliminate
that
as a source of the problem. Oil in the CCV system doesn't help either,
and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:3IjOh.81737$DN.58716 (AT) pd7urf2no (DOT) ..
So I'm getting good vacuum using the very imprecise "finger over the
hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts.
Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm
while
"idling". Usually it starts at about 800rpm when I start it up, and
stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some
oil
in
my air filter as well, and as per these websites, it seems that may be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this
be
causing my problem with the high idle? If nothing else, I'm figuring
that
oil in the air filter probably isn't helping keep the throttle body
really
clean, since the oil can get into the air system from there.

Clint

When our 88 does that, I pull off the electrical plug to the TPS and
give it a spray with contact cleaner then am usually good to go for a
year or more before it needs it again. Electronic contact cleaner is
the best, but WD40 will work.

That works every time on ours.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Clint wrote:

So I'm getting good vacuum using the very imprecise "finger over the
hose end" at the CCV hose, and the TPS sensor goes from about 1 to 5
volts. Is there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and
stays constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some
oil in my air filter as well, and as per these websites, it seems that
may be that cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring
that oil in the air filter probably isn't helping keep the throttle body
really clean, since the oil can get into the air system from there.

Clint

I've tried cleaning the contacts on the ISS and TPS with electrical contact
cleaner and a toothbrush, with no change. Forgot to mention that.

Clint

"Mike Romain" <romainm (AT) sympatico (DOT) ca> wrote

When our 88 does that, I pull off the electrical plug to the TPS and give
it a spray with contact cleaner then am usually good to go for a year or
more before it needs it again. Electronic contact cleaner is the best,
but WD40 will work.

That works every time on ours.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Clint wrote:
So I'm getting good vacuum using the very imprecise "finger over the hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts.
Is there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and
stays constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some oil
in my air filter as well, and as per these websites, it seems that may be
that cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring
that oil in the air filter probably isn't helping keep the throttle body
really clean, since the oil can get into the air system from there.

Clint

I'm thinking it may not be too easy to haul the throttle body off, but I'd
imagine that would make it much easier to clean properly?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote

Agreed. The IAC too. (Idle Air Controller). This can get jammed with
tiny
amounts of deposits. I would probably use carburetor cleaner.

Earle

"Carl S" <carlsaiyed (AT) REMOVE (DOT) hotmail.com> wrote in message
news:R-6dnXAjo_RZfJTbnZ2dnUVZ_segnZ2d (AT) comcast (DOT) com...
Scrub till you'd eat from it.

Carl

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:S5lOh.82165$DN.39493 (AT) pd7urf2no (DOT) ..
Well, I got in there with a brush and solvent, and took off some stuff
on
the sides (beside the butterfly valve, for lack of the technical
phrases).
But it's opening and closing easily, and it's stopping when it hits the
metal stop on the outside of the throttle. But is it perfectly clean?
No. Should I scrub some more?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote in message
news:zfOdnQqMyL_oSpTbnZ2dnUVZ_o-knZ2d (AT) comcast (DOT) com...
Have you cleaned the throttle body? It's real easy and will eliminate
that
as a source of the problem. Oil in the CCV system doesn't help
either,
and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:3IjOh.81737$DN.58716 (AT) pd7urf2no (DOT) ..
So I'm getting good vacuum using the very imprecise "finger over the
hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5
volts.
Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm
while
"idling". Usually it starts at about 800rpm when I start it up, and
stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some
oil
in
my air filter as well, and as per these websites, it seems that may
be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this
be
causing my problem with the high idle? If nothing else, I'm figuring
that
oil in the air filter probably isn't helping keep the throttle body
really
clean, since the oil can get into the air system from there.

Clint

BTW, this problem SEEMS to have started about the same time as I hauled the
old radiator and water pump out and replaced it. Could very easily just be
coincidence, though. I've tried checking all the vacuum hoses in particular
around the area I was working in, but nothing popped up.

I'm tempted to head out to a wrecker, and see about snagging an old throttle
body (preferably with sensors), just for S&G. Give me something to swap out
some parts to try seeing what's wrong.

So it's not seeming that bad CCV valves/hoses should be causing the high
idle, though?

Clint

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote

So I'm getting good vacuum using the very imprecise "finger over the hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5 volts. Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm while
"idling". Usually it starts at about 800rpm when I start it up, and stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting some oil
in my air filter as well, and as per these websites, it seems that may be
that cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this be
causing my problem with the high idle? If nothing else, I'm figuring that
oil in the air filter probably isn't helping keep the throttle body really
clean, since the oil can get into the air system from there.

Clint

It's only four bolts that hold the TB on, and the cables. Takes about 5
minutes to pull. Don't loose the cable clips, and be sure you make a note of
what cables go where.

Carl


"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote

I'm thinking it may not be too easy to haul the throttle body off, but I'd
imagine that would make it much easier to clean properly?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote in message
news:m5idncsNF6SeepTbnZ2dnUVZ_vShnZ2d (AT) comcast (DOT) com...
Agreed. The IAC too. (Idle Air Controller). This can get jammed with
tiny
amounts of deposits. I would probably use carburetor cleaner.

Earle

"Carl S" <carlsaiyed (AT) REMOVE (DOT) hotmail.com> wrote in message
news:R-6dnXAjo_RZfJTbnZ2dnUVZ_segnZ2d (AT) comcast (DOT) com...
Scrub till you'd eat from it.

Carl

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:S5lOh.82165$DN.39493 (AT) pd7urf2no (DOT) ..
Well, I got in there with a brush and solvent, and took off some stuff
on
the sides (beside the butterfly valve, for lack of the technical
phrases).
But it's opening and closing easily, and it's stopping when it hits
the
metal stop on the outside of the throttle. But is it perfectly clean?
No. Should I scrub some more?

Clint

"Earle Horton" <apodo (AT) gracioso (DOT) usa> wrote in message
news:zfOdnQqMyL_oSpTbnZ2dnUVZ_o-knZ2d (AT) comcast (DOT) com...
Have you cleaned the throttle body? It's real easy and will
eliminate
that
as a source of the problem. Oil in the CCV system doesn't help
either,
and
cleaning the orifices is in principle also easy.

Earle

"Clint" <cneufeld (AT) mysocks (DOT) shaw.ca> wrote in message
news:3IjOh.81737$DN.58716 (AT) pd7urf2no (DOT) ..
So I'm getting good vacuum using the very imprecise "finger over the
hose
end" at the CCV hose, and the TPS sensor goes from about 1 to 5
volts.
Is
there some other things I should check?

Today it behaved differently than usual, hitting close to 3000 rpm
while
"idling". Usually it starts at about 800rpm when I start it up, and
stays
constant at about 1500.

Could having a bad CCV valve be causing my problem? I'm getting
some
oil
in
my air filter as well, and as per these websites, it seems that may
be
that
cause of the oil:
http://jeep.off-road.com/jeep/articl....jsp?id=257836
http://jeep.off-road.com/jeep/articl....jsp?id=257985

I did try sealing around the grommets with some RTV silicone, but it
didn't
seem to make a difference.

I guess I KNOW that I need to fix the CCV hoses/valves, but can this
be
causing my problem with the high idle? If nothing else, I'm
figuring
that
oil in the air filter probably isn't helping keep the throttle body
really
clean, since the oil can get into the air system from there.

Clint