2001 Gr. Cherokee Laredo

Another question on my Jeep Gr. Cherokee. Its got the 6cyl engine and
ever since its warmed up here in MT, it is having difficulties
starting. Basically if its under 45 degrees in the morning I turn the
key it starts right up no problem. On warmer mornings now which will
keep getting that way or even when just running errands in the middle
of the day the jeep takes a few cycles of the ignition before it
starts. I had asked someone about it and they told me to try turning
the key to the on position (But not where it turns over) and then back
off and on basically 3 times and then on the 4th one try to start it.
Well that works like a charm, and he was saying it resets something.

Didn't give me any other insight to it and he's on vacation for a few
weeks now anyway. Was wondering if anyone else might have an idea as
to what might be happening. It runs great just when you try and start
it when its warm outside, kind of the opposite of most people but to
me it would seem there is some sort of temp sensor or something but i
have no clue.

Thanks.

there is a trick on the inline 6 bad starting problem dating back to the XJ
Cherokee....gunk in the throttle body glazes over a sensor.....take off the
air hose and expose the throttle body...you will see a sensor connection on
the body...unplug and clean with spray of throttle body cleaner safe for
contacts....most any will do...next look in the body where the sensor plugs
in and you will see a small section where the sensor gets info...clean real
good with a tooth brush and the thottle cleaner.....clean all around and
rescrew the air hose back on and your done..this one sensor can get so
gunked up it will keep the jeep from starting.....good luck..


"NewbieJeepGuy" <ndittoo (AT) yahoo (DOT) com> wrote

Another question on my Jeep Gr. Cherokee. Its got the 6cyl engine and
ever since its warmed up here in MT, it is having difficulties
starting. Basically if its under 45 degrees in the morning I turn the
key it starts right up no problem. On warmer mornings now which will
keep getting that way or even when just running errands in the middle
of the day the jeep takes a few cycles of the ignition before it
starts. I had asked someone about it and they told me to try turning
the key to the on position (But not where it turns over) and then back
off and on basically 3 times and then on the 4th one try to start it.
Well that works like a charm, and he was saying it resets something.

Didn't give me any other insight to it and he's on vacation for a few
weeks now anyway. Was wondering if anyone else might have an idea as
to what might be happening. It runs great just when you try and start
it when its warm outside, kind of the opposite of most people but to
me it would seem there is some sort of temp sensor or something but i
have no clue.

Thanks.

So that sensor would cause the start up issues? Or issues while it
was running? Right now once its started it runs great no problems its
just the starting part when warm. Also would you have a diagram of
where the throttle body would be? I'm kind of new to this mechanic
stuff and haven't even tried to look under the hood of this one yet.
The sensor your talking about is it the throttle position sensor?

Thanks.

On 15 May 2007 21:00:31 -0700, NewbieJeepGuy <ndittoo (AT) yahoo (DOT) com>
wrote:

So that sensor would cause the start up issues? Or issues while it
was running? Right now once its started it runs great no problems its
just the starting part when warm. Also would you have a diagram of
where the throttle body would be? I'm kind of new to this mechanic
stuff and haven't even tried to look under the hood of this one yet.
The sensor your talking about is it the throttle position sensor?

There is a possiblity that your ECT sensor is flakey. (Engine Coolant
Tempature) and causing the mixure to be a bit rich on warmers starts
causing delayed starts. This can effect many brands of vehicles.
-----------------
TheSnoMan.com

The throttle position sensors on the throttle body are notorious for
getting a bad electrical connection, but that doesn't 'reset' with the
key priming the fuel line like you are doing with the 3 times on.

It sure can't hurt to just unplug the two plugs on the throttle body and
give them a spray clean with a contact cleaner or WD40 even. If it
changes, you have it.

You are basically describing fuel leaking down from the fuel line by
doing what you post though.

There are two valves that can leak, one is in the tank on the pump and
the other is on the fuel rail. There are test procedures for this but
you would have to be kinda familiar with engines....

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)

NewbieJeepGuy wrote:

Another question on my Jeep Gr. Cherokee. Its got the 6cyl engine and
ever since its warmed up here in MT, it is having difficulties
starting. Basically if its under 45 degrees in the morning I turn the
key it starts right up no problem. On warmer mornings now which will
keep getting that way or even when just running errands in the middle
of the day the jeep takes a few cycles of the ignition before it
starts. I had asked someone about it and they told me to try turning
the key to the on position (But not where it turns over) and then back
off and on basically 3 times and then on the 4th one try to start it.
Well that works like a charm, and he was saying it resets something.

Didn't give me any other insight to it and he's on vacation for a few
weeks now anyway. Was wondering if anyone else might have an idea as
to what might be happening. It runs great just when you try and start
it when its warm outside, kind of the opposite of most people but to
me it would seem there is some sort of temp sensor or something but i
have no clue.

Thanks.

When you talk about two valves leaking, are you talking about fuel
leaking out? Or just an air leak to lose pressure of some sort?

Thanks.

no, it is not the throttle position sensor, that is some where else....this
sensor is on the throttle body itself....follow the hose from the air
cleaner back to the throttle....that is where you need to look and
clean....it has to do with "starting" this sensor, not the actual running as
I have seen....my XJ was dead in the water, this newsgroup advised me to
clean this and never had a problem again...actually we clean all our
vehicles and found the same gunk clogs even my 2001 Grand Cherokee's inline
6...


"NewbieJeepGuy" <ndittoo (AT) yahoo (DOT) com> wrote

So that sensor would cause the start up issues? Or issues while it
was running? Right now once its started it runs great no problems its
just the starting part when warm. Also would you have a diagram of
where the throttle body would be? I'm kind of new to this mechanic
stuff and haven't even tried to look under the hood of this one yet.
The sensor your talking about is it the throttle position sensor?

Thanks.

NewbieJeepGuy wrote:

When you talk about two valves leaking, are you talking about fuel
leaking out? Or just an air leak to lose pressure of some sort?

Thanks.

The valves are 'fuel' valves that are supposed to hold the pressure in
the gas line when the engine is shut off.

By priming the line with using the key on to run but not start method,
the fuel is once again immediately available to be burned.

There are tests for this like mentioned, but it involves special
equipment and know how.

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)

Umm... The 'TPS or 'throttle position sensor' is located on.... the
'throttle body'.

There is also an idle air control module located on the throttle body.

The IAC gets gummed up and won't let it idle. The TPS gets a bad
connection and won't let it start fast or idle right too.

Anyhow, ours always starts faster after I have cleaned the electrical
connection on both the TPS and IAC. I haven't needed to clean out my
IAC yet.

Priming mine doesn't help though.

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)

Mindy wrote:

no, it is not the throttle position sensor, that is some where else....this
sensor is on the throttle body itself....follow the hose from the air
cleaner back to the throttle....that is where you need to look and
clean....it has to do with "starting" this sensor, not the actual running as
I have seen....my XJ was dead in the water, this newsgroup advised me to
clean this and never had a problem again...actually we clean all our
vehicles and found the same gunk clogs even my 2001 Grand Cherokee's inline
6...


"NewbieJeepGuy" <ndittoo (AT) yahoo (DOT) com> wrote in message
news:1179288031.782384.191600 (AT) h2g2000hsg (DOT) googlegroups.com...
So that sensor would cause the start up issues? Or issues while it
was running? Right now once its started it runs great no problems its
just the starting part when warm. Also would you have a diagram of
where the throttle body would be? I'm kind of new to this mechanic
stuff and haven't even tried to look under the hood of this one yet.
The sensor your talking about is it the throttle position sensor?

Thanks.