Will Honea

On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.

I don't know if the TPS is the real culprit on the 88 (Renix) system
or not. No matter what I do mine will still stall after a cold start
if I take off down hill and use the engine to hold it going down with
my foot off the gas. If I tap the gas just before I stop, all is
well; otherwise it will stagger and frequently die when I put the
clutch in. I'm about convinced that it's a characteristic of the
computer where it's over-correcting for the engine braking and not
responding fast enough when it tries to get to an unloaded idle state.
If yours is like mine, when it staggers and doesn't die it surges
pretty good before settling down. Blasted nuisance, whatever it is.

--
Will Honea <whonea@codenet.net>

Will Honea

On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.

I don't know if the TPS is the real culprit on the 88 (Renix) system
or not. No matter what I do mine will still stall after a cold start
if I take off down hill and use the engine to hold it going down with
my foot off the gas. If I tap the gas just before I stop, all is
well; otherwise it will stagger and frequently die when I put the
clutch in. I'm about convinced that it's a characteristic of the
computer where it's over-correcting for the engine braking and not
responding fast enough when it tries to get to an unloaded idle state.
If yours is like mine, when it staggers and doesn't die it surges
pretty good before settling down. Blasted nuisance, whatever it is.

--
Will Honea <whonea@codenet.net>

Will Honea

On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> We had that issue with out 88 Cherokee 4.0.
>
> It also would stall at the first or second stop in the morning.
>
> That was caused by a dirty plug on the TPS or throttle position sensor
> on the throttle body.
>
> These plugs are only low powered computer plugs and the slightest dirt
> makes them shaky.
>
> I used a proper electronic contact cleaner the first time on it and it
> lasted a couple years. The second time it went and stayed at high revs
> way off road so I used WD40 on it. That has lasted almost a year to and
> my wife just mentioned it needs another clean soon.

I don't know if the TPS is the real culprit on the 88 (Renix) system
or not. No matter what I do mine will still stall after a cold start
if I take off down hill and use the engine to hold it going down with
my foot off the gas. If I tap the gas just before I stop, all is
well; otherwise it will stagger and frequently die when I put the
clutch in. I'm about convinced that it's a characteristic of the
computer where it's over-correcting for the engine braking and not
responding fast enough when it tries to get to an unloaded idle state.
If yours is like mine, when it staggers and doesn't die it surges
pretty good before settling down. Blasted nuisance, whatever it is.

--
Will Honea <whonea@codenet.net>

Mike Romain

Will Honea wrote:
>
> On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> wrote:
>
> > We had that issue with out 88 Cherokee 4.0.
> >
> > It also would stall at the first or second stop in the morning.
> >
> > That was caused by a dirty plug on the TPS or throttle position sensor
> > on the throttle body.
> >
> > These plugs are only low powered computer plugs and the slightest dirt
> > makes them shaky.
> >
> > I used a proper electronic contact cleaner the first time on it and it
> > lasted a couple years. The second time it went and stayed at high revs
> > way off road so I used WD40 on it. That has lasted almost a year to and
> > my wife just mentioned it needs another clean soon.
>
> I don't know if the TPS is the real culprit on the 88 (Renix) system
> or not. No matter what I do mine will still stall after a cold start
> if I take off down hill and use the engine to hold it going down with
> my foot off the gas. If I tap the gas just before I stop, all is
> well; otherwise it will stagger and frequently die when I put the
> clutch in. I'm about convinced that it's a characteristic of the
> computer where it's over-correcting for the engine braking and not
> responding fast enough when it tries to get to an unloaded idle state.
> If yours is like mine, when it staggers and doesn't die it surges
> pretty good before settling down. Blasted nuisance, whatever it is.
>
> --
> Will Honea <whonea@codenet.net>

No issues like that on ours.

When I clean the contacts, it purrs like new again for a year or more.

You 'can' use a volt meter and check the TPS out. I think you can also
ohm it out, but the book test is for volts.

You need the key on and engine off, AC off and you back probe the TPS
plug with the meter probes looking for volts. Use the center wire and
either outside wire. One will be a mirror image of the other for
readings. One side is for the auto tranny.

At the idle setting on the throttle lever, the TPS should read greater
than .02 volts or 200 ma. One setting says .026 volts for the pre 91
adjustable ones.

At full throttle, it should read less than 4.8 volts.

The volt rise or drop should also be smooth, not jerky.

Same if you have it unplugged and are using ohms. The rise or drop in
ohms should be smooth.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike Romain

Will Honea wrote:
>
> On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> wrote:
>
> > We had that issue with out 88 Cherokee 4.0.
> >
> > It also would stall at the first or second stop in the morning.
> >
> > That was caused by a dirty plug on the TPS or throttle position sensor
> > on the throttle body.
> >
> > These plugs are only low powered computer plugs and the slightest dirt
> > makes them shaky.
> >
> > I used a proper electronic contact cleaner the first time on it and it
> > lasted a couple years. The second time it went and stayed at high revs
> > way off road so I used WD40 on it. That has lasted almost a year to and
> > my wife just mentioned it needs another clean soon.
>
> I don't know if the TPS is the real culprit on the 88 (Renix) system
> or not. No matter what I do mine will still stall after a cold start
> if I take off down hill and use the engine to hold it going down with
> my foot off the gas. If I tap the gas just before I stop, all is
> well; otherwise it will stagger and frequently die when I put the
> clutch in. I'm about convinced that it's a characteristic of the
> computer where it's over-correcting for the engine braking and not
> responding fast enough when it tries to get to an unloaded idle state.
> If yours is like mine, when it staggers and doesn't die it surges
> pretty good before settling down. Blasted nuisance, whatever it is.
>
> --
> Will Honea <whonea@codenet.net>

No issues like that on ours.

When I clean the contacts, it purrs like new again for a year or more.

You 'can' use a volt meter and check the TPS out. I think you can also
ohm it out, but the book test is for volts.

You need the key on and engine off, AC off and you back probe the TPS
plug with the meter probes looking for volts. Use the center wire and
either outside wire. One will be a mirror image of the other for
readings. One side is for the auto tranny.

At the idle setting on the throttle lever, the TPS should read greater
than .02 volts or 200 ma. One setting says .026 volts for the pre 91
adjustable ones.

At full throttle, it should read less than 4.8 volts.

The volt rise or drop should also be smooth, not jerky.

Same if you have it unplugged and are using ohms. The rise or drop in
ohms should be smooth.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike Romain

Will Honea wrote:
>
> On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> wrote:
>
> > We had that issue with out 88 Cherokee 4.0.
> >
> > It also would stall at the first or second stop in the morning.
> >
> > That was caused by a dirty plug on the TPS or throttle position sensor
> > on the throttle body.
> >
> > These plugs are only low powered computer plugs and the slightest dirt
> > makes them shaky.
> >
> > I used a proper electronic contact cleaner the first time on it and it
> > lasted a couple years. The second time it went and stayed at high revs
> > way off road so I used WD40 on it. That has lasted almost a year to and
> > my wife just mentioned it needs another clean soon.
>
> I don't know if the TPS is the real culprit on the 88 (Renix) system
> or not. No matter what I do mine will still stall after a cold start
> if I take off down hill and use the engine to hold it going down with
> my foot off the gas. If I tap the gas just before I stop, all is
> well; otherwise it will stagger and frequently die when I put the
> clutch in. I'm about convinced that it's a characteristic of the
> computer where it's over-correcting for the engine braking and not
> responding fast enough when it tries to get to an unloaded idle state.
> If yours is like mine, when it staggers and doesn't die it surges
> pretty good before settling down. Blasted nuisance, whatever it is.
>
> --
> Will Honea <whonea@codenet.net>

No issues like that on ours.

When I clean the contacts, it purrs like new again for a year or more.

You 'can' use a volt meter and check the TPS out. I think you can also
ohm it out, but the book test is for volts.

You need the key on and engine off, AC off and you back probe the TPS
plug with the meter probes looking for volts. Use the center wire and
either outside wire. One will be a mirror image of the other for
readings. One side is for the auto tranny.

At the idle setting on the throttle lever, the TPS should read greater
than .02 volts or 200 ma. One setting says .026 volts for the pre 91
adjustable ones.

At full throttle, it should read less than 4.8 volts.

The volt rise or drop should also be smooth, not jerky.

Same if you have it unplugged and are using ohms. The rise or drop in
ohms should be smooth.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Mike Romain

Will Honea wrote:
>
> On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> wrote:
>
> > We had that issue with out 88 Cherokee 4.0.
> >
> > It also would stall at the first or second stop in the morning.
> >
> > That was caused by a dirty plug on the TPS or throttle position sensor
> > on the throttle body.
> >
> > These plugs are only low powered computer plugs and the slightest dirt
> > makes them shaky.
> >
> > I used a proper electronic contact cleaner the first time on it and it
> > lasted a couple years. The second time it went and stayed at high revs
> > way off road so I used WD40 on it. That has lasted almost a year to and
> > my wife just mentioned it needs another clean soon.
>
> I don't know if the TPS is the real culprit on the 88 (Renix) system
> or not. No matter what I do mine will still stall after a cold start
> if I take off down hill and use the engine to hold it going down with
> my foot off the gas. If I tap the gas just before I stop, all is
> well; otherwise it will stagger and frequently die when I put the
> clutch in. I'm about convinced that it's a characteristic of the
> computer where it's over-correcting for the engine braking and not
> responding fast enough when it tries to get to an unloaded idle state.
> If yours is like mine, when it staggers and doesn't die it surges
> pretty good before settling down. Blasted nuisance, whatever it is.
>
> --
> Will Honea <whonea@codenet.net>

No issues like that on ours.

When I clean the contacts, it purrs like new again for a year or more.

You 'can' use a volt meter and check the TPS out. I think you can also
ohm it out, but the book test is for volts.

You need the key on and engine off, AC off and you back probe the TPS
plug with the meter probes looking for volts. Use the center wire and
either outside wire. One will be a mirror image of the other for
readings. One side is for the auto tranny.

At the idle setting on the throttle lever, the TPS should read greater
than .02 volts or 200 ma. One setting says .026 volts for the pre 91
adjustable ones.

At full throttle, it should read less than 4.8 volts.

The volt rise or drop should also be smooth, not jerky.

Same if you have it unplugged and are using ohms. The rise or drop in
ohms should be smooth.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Will Honea

On Wed, 14 Jul 2004 14:19:34 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high revs
> > > way off road so I used WD40 on it. That has lasted almost a year to and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.

Been thru all that. I can almost predict when it's going to stagger
at the bottom of the hill anymore - it seems like it always happens on
a cool morning. Almost never happens when it's hot or actually cold
(like freezing or below) but in that middle ground it's fairly common
for me. I just live with it.

--
Will Honea

Will Honea

On Wed, 14 Jul 2004 14:19:34 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high revs
> > > way off road so I used WD40 on it. That has lasted almost a year to and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.

Been thru all that. I can almost predict when it's going to stagger
at the bottom of the hill anymore - it seems like it always happens on
a cool morning. Almost never happens when it's hot or actually cold
(like freezing or below) but in that middle ground it's fairly common
for me. I just live with it.

--
Will Honea

Will Honea

On Wed, 14 Jul 2004 14:19:34 UTC Mike Romain <romainm@sympatico.ca>
wrote:

> Will Honea wrote:
> >
> > On Tue, 13 Jul 2004 14:06:09 UTC Mike Romain <romainm@sympatico.ca>
> > wrote:
> >
> > > We had that issue with out 88 Cherokee 4.0.
> > >
> > > It also would stall at the first or second stop in the morning.
> > >
> > > That was caused by a dirty plug on the TPS or throttle position sensor
> > > on the throttle body.
> > >
> > > These plugs are only low powered computer plugs and the slightest dirt
> > > makes them shaky.
> > >
> > > I used a proper electronic contact cleaner the first time on it and it
> > > lasted a couple years. The second time it went and stayed at high revs
> > > way off road so I used WD40 on it. That has lasted almost a year to and
> > > my wife just mentioned it needs another clean soon.
> >
> > I don't know if the TPS is the real culprit on the 88 (Renix) system
> > or not. No matter what I do mine will still stall after a cold start
> > if I take off down hill and use the engine to hold it going down with
> > my foot off the gas. If I tap the gas just before I stop, all is
> > well; otherwise it will stagger and frequently die when I put the
> > clutch in. I'm about convinced that it's a characteristic of the
> > computer where it's over-correcting for the engine braking and not
> > responding fast enough when it tries to get to an unloaded idle state.
> > If yours is like mine, when it staggers and doesn't die it surges
> > pretty good before settling down. Blasted nuisance, whatever it is.
> >
> > --
> > Will Honea <whonea@codenet.net>
>
> No issues like that on ours.
>
> When I clean the contacts, it purrs like new again for a year or more.
>
> You 'can' use a volt meter and check the TPS out. I think you can also
> ohm it out, but the book test is for volts.
>
> You need the key on and engine off, AC off and you back probe the TPS
> plug with the meter probes looking for volts. Use the center wire and
> either outside wire. One will be a mirror image of the other for
> readings. One side is for the auto tranny.
>
> At the idle setting on the throttle lever, the TPS should read greater
> than .02 volts or 200 ma. One setting says .026 volts for the pre 91
> adjustable ones.
>
> At full throttle, it should read less than 4.8 volts.
>
> The volt rise or drop should also be smooth, not jerky.
>
> Same if you have it unplugged and are using ohms. The rise or drop in
> ohms should be smooth.

Been thru all that. I can almost predict when it's going to stagger
at the bottom of the hill anymore - it seems like it always happens on
a cool morning. Almost never happens when it's hot or actually cold
(like freezing or below) but in that middle ground it's fairly common
for me. I just live with it.

--
Will Honea