Jon

Hello Fellow Jeepsters,

Warm weather is upon us (at least in New England) and the new tight-as-
a-drum soft top is gently billowing!

If you may remember, I had a PS pump replaced a few short weeks ago,
and upon pickup noticed the check engine light was on, followed by
high revving startups, almost conking out gas pedal taps, and
stuttering on heavy acceleration. I figured the TPS got fouled out
from the engine washdown and cleaned the contacts with cleaner as I
read Mr. Romaine (sp?) suggest countless times here before. In
addition, the mechanic suggested new plugs, wires, rotor, etc... and I
took the advice yet nothing changed.

Now it seems to take a while to fire up on starting, just cranking for
what seems like forever (3 or 4 seconds)...but the time is getting
longer as each day passes, and heavy acceleration is a joke. High revs
on startup are intermittent as well as the near-conkout when the gas
pedal is goosed - some days it's fine, others it's bad. It also seems
to miss a beat every-so-often while at idle.

I did the ignition code trick and it's saying 24 (12, 24, 33, 55).

12 - recently unhooked battery to install cd player
24 - TPS voltage
33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
55 - blinking lightshow is over

Will a new TPS really clear this up? I would go and get one right away
if it weren't the darn-tootin' cash flow issue. Money is a little
tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
are these codes? I did purchase STP Throttle Body Cleaner and plan on
doing it this weekend - does the part need to be removed? Or can I
blast the crap out of it right there?


All the best, and thanks in advance,

~Jon

91 YJ 4.0 Auto

Mike Romain

So do you have a YJ or a Jeepster?

There are very few 'Jeepsters' on this group and I highly doubt they
would have any idea about a modern FI engine screwing up unless they
have modified their rigs.

I am not a Jeepster owner, but I do know what the voltage readings
'should' be on a 4.0 engine.

With the engine off and the AC off and the key in run, you back probe
the TPS plug with a multimeter to read the voltage levels. The two
wires for engine control will read 200 mv at the idle position and 4.8V
at the wide open throttle position with a smooth rise. The other wire
for the tranny shifter will read opposite to that or 4.8 at idle.

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)

Jon wrote:
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player
> 24 - TPS voltage
> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes? I did purchase STP Throttle Body Cleaner and plan on
> doing it this weekend - does the part need to be removed? Or can I
> blast the crap out of it right there?
>
>
> All the best, and thanks in advance,
>
> ~Jon
>
> 91 YJ 4.0 Auto
>

Mike Romain

So do you have a YJ or a Jeepster?

There are very few 'Jeepsters' on this group and I highly doubt they
would have any idea about a modern FI engine screwing up unless they
have modified their rigs.

I am not a Jeepster owner, but I do know what the voltage readings
'should' be on a 4.0 engine.

With the engine off and the AC off and the key in run, you back probe
the TPS plug with a multimeter to read the voltage levels. The two
wires for engine control will read 200 mv at the idle position and 4.8V
at the wide open throttle position with a smooth rise. The other wire
for the tranny shifter will read opposite to that or 4.8 at idle.

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)

Jon wrote:
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player
> 24 - TPS voltage
> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes? I did purchase STP Throttle Body Cleaner and plan on
> doing it this weekend - does the part need to be removed? Or can I
> blast the crap out of it right there?
>
>
> All the best, and thanks in advance,
>
> ~Jon
>
> 91 YJ 4.0 Auto
>

Mike Romain

So do you have a YJ or a Jeepster?

There are very few 'Jeepsters' on this group and I highly doubt they
would have any idea about a modern FI engine screwing up unless they
have modified their rigs.

I am not a Jeepster owner, but I do know what the voltage readings
'should' be on a 4.0 engine.

With the engine off and the AC off and the key in run, you back probe
the TPS plug with a multimeter to read the voltage levels. The two
wires for engine control will read 200 mv at the idle position and 4.8V
at the wide open throttle position with a smooth rise. The other wire
for the tranny shifter will read opposite to that or 4.8 at idle.

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)

Jon wrote:
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player
> 24 - TPS voltage
> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes? I did purchase STP Throttle Body Cleaner and plan on
> doing it this weekend - does the part need to be removed? Or can I
> blast the crap out of it right there?
>
>
> All the best, and thanks in advance,
>
> ~Jon
>
> 91 YJ 4.0 Auto
>

Mike Romain

So do you have a YJ or a Jeepster?

There are very few 'Jeepsters' on this group and I highly doubt they
would have any idea about a modern FI engine screwing up unless they
have modified their rigs.

I am not a Jeepster owner, but I do know what the voltage readings
'should' be on a 4.0 engine.

With the engine off and the AC off and the key in run, you back probe
the TPS plug with a multimeter to read the voltage levels. The two
wires for engine control will read 200 mv at the idle position and 4.8V
at the wide open throttle position with a smooth rise. The other wire
for the tranny shifter will read opposite to that or 4.8 at idle.

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)

Jon wrote:
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player
> 24 - TPS voltage
> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes? I did purchase STP Throttle Body Cleaner and plan on
> doing it this weekend - does the part need to be removed? Or can I
> blast the crap out of it right there?
>
>
> All the best, and thanks in advance,
>
> ~Jon
>
> 91 YJ 4.0 Auto
>

Jeff Strickland

"Jon" <campingisgood@gmail.com> wrote in message
news:1177513914.779787.39280@r30g2000prh.googlegro ups.com...
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player

This code will always come up.


> 24 - TPS voltage

This can cause poor starting and rough running.


> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)

I can't explain why this would come on.



> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes?

I'd not second guess the codes. The trouble you have is that you don't
really know how long those codes have been stored. I suggest you clear them,
then look again in a week or so and see if any of them have come back. You
should expect to see 12 and 55, any others (especially those that repeat
from this list) are codes that need your attention.

Jeff Strickland

"Jon" <campingisgood@gmail.com> wrote in message
news:1177513914.779787.39280@r30g2000prh.googlegro ups.com...
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player

This code will always come up.


> 24 - TPS voltage

This can cause poor starting and rough running.


> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)

I can't explain why this would come on.



> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes?

I'd not second guess the codes. The trouble you have is that you don't
really know how long those codes have been stored. I suggest you clear them,
then look again in a week or so and see if any of them have come back. You
should expect to see 12 and 55, any others (especially those that repeat
from this list) are codes that need your attention.

Jeff Strickland

"Jon" <campingisgood@gmail.com> wrote in message
news:1177513914.779787.39280@r30g2000prh.googlegro ups.com...
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player

This code will always come up.


> 24 - TPS voltage

This can cause poor starting and rough running.


> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)

I can't explain why this would come on.



> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes?

I'd not second guess the codes. The trouble you have is that you don't
really know how long those codes have been stored. I suggest you clear them,
then look again in a week or so and see if any of them have come back. You
should expect to see 12 and 55, any others (especially those that repeat
from this list) are codes that need your attention.

Jeff Strickland

"Jon" <campingisgood@gmail.com> wrote in message
news:1177513914.779787.39280@r30g2000prh.googlegro ups.com...
> Hello Fellow Jeepsters,
>
> Warm weather is upon us (at least in New England) and the new tight-as-
> a-drum soft top is gently billowing!
>
> If you may remember, I had a PS pump replaced a few short weeks ago,
> and upon pickup noticed the check engine light was on, followed by
> high revving startups, almost conking out gas pedal taps, and
> stuttering on heavy acceleration. I figured the TPS got fouled out
> from the engine washdown and cleaned the contacts with cleaner as I
> read Mr. Romaine (sp?) suggest countless times here before. In
> addition, the mechanic suggested new plugs, wires, rotor, etc... and I
> took the advice yet nothing changed.
>
> Now it seems to take a while to fire up on starting, just cranking for
> what seems like forever (3 or 4 seconds)...but the time is getting
> longer as each day passes, and heavy acceleration is a joke. High revs
> on startup are intermittent as well as the near-conkout when the gas
> pedal is goosed - some days it's fine, others it's bad. It also seems
> to miss a beat every-so-often while at idle.
>
> I did the ignition code trick and it's saying 24 (12, 24, 33, 55).
>
> 12 - recently unhooked battery to install cd player

This code will always come up.


> 24 - TPS voltage

This can cause poor starting and rough running.


> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)

I can't explain why this would come on.



> 55 - blinking lightshow is over
>
> Will a new TPS really clear this up? I would go and get one right away
> if it weren't the darn-tootin' cash flow issue. Money is a little
> tight to drop $50 (at NAPA) on a new TPS... so really - how accurate
> are these codes?

I'd not second guess the codes. The trouble you have is that you don't
really know how long those codes have been stored. I suggest you clear them,
then look again in a week or so and see if any of them have come back. You
should expect to see 12 and 55, any others (especially those that repeat
from this list) are codes that need your attention.

Mike Romain

Jeff Strickland wrote:
>
> "Jon" <campingisgood@gmail.com> wrote in message
> news:1177513914.779787.39280@r30g2000prh.googlegro ups.com...

>> 33 - no AC (AC?! in a Jeep Wrangler?!?! hahahaha!!!)
>
> I can't explain why this would come on.
>

Do you think it might be because he 'has' no AC.....?

;-)

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)