Casper

Where is the CCV located? I'm not finding it in my book.

~Casper
'93 GC Ltd.

>The 4.0 doesn't have an EGR, just a CCV. When it's tube plugs, oil
>blows into the air filter.
>
>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)

DougW

Casper did pass the time by typing:
> Where is the CCV located? I'm not finding it in my book.

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Roughly the same for all 4.0 engines.

--
DougW

DougW

Casper did pass the time by typing:
> Where is the CCV located? I'm not finding it in my book.

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Roughly the same for all 4.0 engines.

--
DougW

DougW

Casper did pass the time by typing:
> Where is the CCV located? I'm not finding it in my book.

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Roughly the same for all 4.0 engines.

--
DougW

DougW

Casper did pass the time by typing:
> Where is the CCV located? I'm not finding it in my book.

http://www.off-road.com/jeep/cheroke...ltr/blowby.htm

Roughly the same for all 4.0 engines.

--
DougW

JD Adams

You're right, Mike. No EGR at all on my rig, and it's probably the
same on all 4.0's. No wonder it runs so well. EGR is the
technological equivalance of throwing a wet blanket on a fire, and
they're difficult to clean when they get gummed up. Smog check techs
love 'em though; they're good for retest business.

I'm going to put my money on the TPS and a dirty throttle body. Some
older computers will throw a code for a low TPS signal, but on a '90,
it's doubtful. Another symptom of TPS failure is an automatic
transmission OD that keeps dropping in and out when cruising. One
could hook up a DVM and check it manually, but they're cheap enough
that replacement makes more sense.

Let us know what you find, Harry.

-JD

JD Adams

You're right, Mike. No EGR at all on my rig, and it's probably the
same on all 4.0's. No wonder it runs so well. EGR is the
technological equivalance of throwing a wet blanket on a fire, and
they're difficult to clean when they get gummed up. Smog check techs
love 'em though; they're good for retest business.

I'm going to put my money on the TPS and a dirty throttle body. Some
older computers will throw a code for a low TPS signal, but on a '90,
it's doubtful. Another symptom of TPS failure is an automatic
transmission OD that keeps dropping in and out when cruising. One
could hook up a DVM and check it manually, but they're cheap enough
that replacement makes more sense.

Let us know what you find, Harry.

-JD

JD Adams

You're right, Mike. No EGR at all on my rig, and it's probably the
same on all 4.0's. No wonder it runs so well. EGR is the
technological equivalance of throwing a wet blanket on a fire, and
they're difficult to clean when they get gummed up. Smog check techs
love 'em though; they're good for retest business.

I'm going to put my money on the TPS and a dirty throttle body. Some
older computers will throw a code for a low TPS signal, but on a '90,
it's doubtful. Another symptom of TPS failure is an automatic
transmission OD that keeps dropping in and out when cruising. One
could hook up a DVM and check it manually, but they're cheap enough
that replacement makes more sense.

Let us know what you find, Harry.

-JD

JD Adams

You're right, Mike. No EGR at all on my rig, and it's probably the
same on all 4.0's. No wonder it runs so well. EGR is the
technological equivalance of throwing a wet blanket on a fire, and
they're difficult to clean when they get gummed up. Smog check techs
love 'em though; they're good for retest business.

I'm going to put my money on the TPS and a dirty throttle body. Some
older computers will throw a code for a low TPS signal, but on a '90,
it's doubtful. Another symptom of TPS failure is an automatic
transmission OD that keeps dropping in and out when cruising. One
could hook up a DVM and check it manually, but they're cheap enough
that replacement makes more sense.

Let us know what you find, Harry.

-JD

Will Honea

The early 4.0's had EGR's but they dropped them at some point. I know
the 87 - 89 XJ/MJ using the Renix computer had them - I've cleaned
mine a couple of times.

My MJ had real idle problems and curing them was a step by step
process. Cleaning the throttle body made a big difference (don't
forget the MAP sensor port!), cleaning the connectors also helped but
the last little bit of surge/die coming to a stop persisted until I
changed out the O2 sensor. It tested good, but the tail pipe said it
was idling rich (black soot, black smoke accelerating from idle when
hot) so I changed the sensor. Now all I have to do is clean the
connectors every so often.

On Sun, 19 Mar 2006 19:56:57 UTC "JD Adams" <JDAdams@Softcom.Net>
wrote:

> You're right, Mike. No EGR at all on my rig, and it's probably the
> same on all 4.0's. No wonder it runs so well. EGR is the
> technological equivalance of throwing a wet blanket on a fire, and
> they're difficult to clean when they get gummed up. Smog check techs
> love 'em though; they're good for retest business.
>
> I'm going to put my money on the TPS and a dirty throttle body. Some
> older computers will throw a code for a low TPS signal, but on a '90,
> it's doubtful. Another symptom of TPS failure is an automatic
> transmission OD that keeps dropping in and out when cruising. One
> could hook up a DVM and check it manually, but they're cheap enough
> that replacement makes more sense.
>
> Let us know what you find, Harry.
>
> -JD
>


--
Will Honea