Bob

Well, I don't know if this will help you any; I'm feeling lazy and not
reading through all the responses you've already gotten to this.
Anyway...

I had similar problems, only I was getting two check engine fault
codes. One said the MAP sensor reading was bad, the other said the TPS
and MAP reading were inconsistent with each other.

So, I replaced the MAP sensor. Problem solved...for half a day!
Engine light came on--MAP code was gone, but the MAP/TPS disagreement
reading was still there.
So, I replaced the TPS. Problem solved--for good. That was 3 or 4
months ago, and I haven't had a problem since, no matter the trip
distance or the alititude (done some high pass trails in Ouray since
then, too!).

So, you might check the MAP sensor, too. I think I saw you mentioning
some issues that you thought sounded like vacuum pressure, too--would
the manifold absolute pressure sensor be applicable to that sort of
diagnosis? (I'm asking, I don't know).

Good luck.

/Bob


M. E. Bye <fxdyna@hotmail.com> wrote in message news:<3dapj05f1lptlnr3m4kn8e9url8skgfn9d@4ax.com>. ..
> On Sat, 04 Sep 2004 07:20:47 -0500, M. E. Bye <fxdyna@hotmail.com>
> wrote:
>
> >On Wed, 01 Sep 2004 17:39:45 -0500, M. E. Bye <fxdyna@hotmail.com>
> >wrote:
> >
> >>About a week ago, my '98 TJ (2.5L, 5-speed, 71K miles) began missing
> >>at highway speed, bucking like a bronco. I chalked it up to a bad
> >>tank of gas, so I dumped in a bottle of HEET and a bottle of fuel
> >>injector cleaner. The problem continued, so I did the same thing with
> >>my next fill-up at a different station. No improvement. Since then,
> >>I've changed the plugs, installed new wires, distributor cap and
> >>rotor, have cleaned the throttle body, and have disconnected all
> >>electrical connections to the throttle body and fuel injectors and
> >>have sprayed electrical contact cleaner on them. I still have an
> >>intermittent miss at speed. Not as severe as before, but I still have
> >>the problem. What's next?
> >>
> >>Thanks in advance for any assistance!
> >>
> >>Mark
> >>'98 TJ
> >>'98 XJ
> >
> >Well, by cracky, it's fixed. It didn't come about without a story,
> >though. I took off from work at noon yesterday (Friday) and set out
> >to my local AutoZone store to drop about $150 on new oxygen sensors.
> >En route, something happened that hadn't before. Specifically my
> >"CHECK ENGINE" light came on. Now I KNEW that I had to have some sort
> >of codes that would display (none did the previous day when my buddy
> >plugged in his code reader). So, when I got to AutoZone, I asked the
> >counter guy if he had a code reader, which he did. He checked it and
> >got a code "TPS/Pedal Travel Sensor". Well, neither one of us knew
> >what a Pedal Travel Sensor was, but both knew what a TPS was.
> >However, the counter guy still suggests strongly that I've got a fuel
> >filter problem and that should be my priority fix. I thanked him and
> >decided that it was now time to go see the Jeep repair guy at a
> >dealership. Drove crosstown and talked with the Jeep technician who
> >really felt it was the throttle position sensor, so I went to their
> >parts counter and asked if they had one. Nope, but they could order
> >it. I had 'em check with a dealership 35 miles down the road. They
> >had 3 of 'em. I got on the cellphone and asked them to hold one, I'd
> >be right there. An hour later, I've got the new one on and everything
> >is back to normal! Now I can get back to spending $$$ on my Jeep for
> >fun things.
> >
> >Thanks to everyone who provided assistance with this.
> >
> >Mark
> >'98 TJ
> >'98 XJ
>
> Took a long ccruise with it yesterday. Ran just fine. Got home and
> it started bucking severely as I was slowing to a stop. Kind of like
> you didn't let the clutch out coming to a stop. It died, but I was
> able to start it again. A few miles down the road, it bucked again
> when taking off from a stop (this time, like letting the clutch out
> too quickly when taking off). I got home with it ok, tho. Today, it
> turns over but won't fire at all. What now?
>
> Mark

Bob

Well, I don't know if this will help you any; I'm feeling lazy and not
reading through all the responses you've already gotten to this.
Anyway...

I had similar problems, only I was getting two check engine fault
codes. One said the MAP sensor reading was bad, the other said the TPS
and MAP reading were inconsistent with each other.

So, I replaced the MAP sensor. Problem solved...for half a day!
Engine light came on--MAP code was gone, but the MAP/TPS disagreement
reading was still there.
So, I replaced the TPS. Problem solved--for good. That was 3 or 4
months ago, and I haven't had a problem since, no matter the trip
distance or the alititude (done some high pass trails in Ouray since
then, too!).

So, you might check the MAP sensor, too. I think I saw you mentioning
some issues that you thought sounded like vacuum pressure, too--would
the manifold absolute pressure sensor be applicable to that sort of
diagnosis? (I'm asking, I don't know).

Good luck.

/Bob


M. E. Bye <fxdyna@hotmail.com> wrote in message news:<3dapj05f1lptlnr3m4kn8e9url8skgfn9d@4ax.com>. ..
> On Sat, 04 Sep 2004 07:20:47 -0500, M. E. Bye <fxdyna@hotmail.com>
> wrote:
>
> >On Wed, 01 Sep 2004 17:39:45 -0500, M. E. Bye <fxdyna@hotmail.com>
> >wrote:
> >
> >>About a week ago, my '98 TJ (2.5L, 5-speed, 71K miles) began missing
> >>at highway speed, bucking like a bronco. I chalked it up to a bad
> >>tank of gas, so I dumped in a bottle of HEET and a bottle of fuel
> >>injector cleaner. The problem continued, so I did the same thing with
> >>my next fill-up at a different station. No improvement. Since then,
> >>I've changed the plugs, installed new wires, distributor cap and
> >>rotor, have cleaned the throttle body, and have disconnected all
> >>electrical connections to the throttle body and fuel injectors and
> >>have sprayed electrical contact cleaner on them. I still have an
> >>intermittent miss at speed. Not as severe as before, but I still have
> >>the problem. What's next?
> >>
> >>Thanks in advance for any assistance!
> >>
> >>Mark
> >>'98 TJ
> >>'98 XJ
> >
> >Well, by cracky, it's fixed. It didn't come about without a story,
> >though. I took off from work at noon yesterday (Friday) and set out
> >to my local AutoZone store to drop about $150 on new oxygen sensors.
> >En route, something happened that hadn't before. Specifically my
> >"CHECK ENGINE" light came on. Now I KNEW that I had to have some sort
> >of codes that would display (none did the previous day when my buddy
> >plugged in his code reader). So, when I got to AutoZone, I asked the
> >counter guy if he had a code reader, which he did. He checked it and
> >got a code "TPS/Pedal Travel Sensor". Well, neither one of us knew
> >what a Pedal Travel Sensor was, but both knew what a TPS was.
> >However, the counter guy still suggests strongly that I've got a fuel
> >filter problem and that should be my priority fix. I thanked him and
> >decided that it was now time to go see the Jeep repair guy at a
> >dealership. Drove crosstown and talked with the Jeep technician who
> >really felt it was the throttle position sensor, so I went to their
> >parts counter and asked if they had one. Nope, but they could order
> >it. I had 'em check with a dealership 35 miles down the road. They
> >had 3 of 'em. I got on the cellphone and asked them to hold one, I'd
> >be right there. An hour later, I've got the new one on and everything
> >is back to normal! Now I can get back to spending $$$ on my Jeep for
> >fun things.
> >
> >Thanks to everyone who provided assistance with this.
> >
> >Mark
> >'98 TJ
> >'98 XJ
>
> Took a long ccruise with it yesterday. Ran just fine. Got home and
> it started bucking severely as I was slowing to a stop. Kind of like
> you didn't let the clutch out coming to a stop. It died, but I was
> able to start it again. A few miles down the road, it bucked again
> when taking off from a stop (this time, like letting the clutch out
> too quickly when taking off). I got home with it ok, tho. Today, it
> turns over but won't fire at all. What now?
>
> Mark

Will Honea

On Thu, 9 Sep 2004 04:10:37 UTC bllsht <nospam@invaliddot.net> wrote:

> >Like I said, after 3 years and 60K miles with the thing I've just
> >learned to release the clutch, tap the gas and live with that first
> >stop at the bottom of the hill.
>
> That's probably the fix right there. Going downhill using the engine to slow
> you down, the computer sees closed throttle but still a higher than normal idle
> speed. That'll make the computer shove the IAC out all the way to try to get
> the idle where it thinks it belongs. The computer has no idea the vehicle is
> moving or that the clutch is engaged, so it doesn't know any better. Then you
> disengage the clutch and the idle drops too much. Being that it's also cold
> just adds to the problem, and it can't recover in time to keep from stalling.
>
> Today's computers are a little smarter and have more info to work with. :-)

I've spent the last 40 years in and out of control system design -
usually a lot more complex than a consumer fuel system - and pretty
much decided that was the situation. That old Bendix computer is
early 80's technology (damn, I hope I never have to replace it!), it's
still in the open loop mode, and the moving parts are moving as slow
as I do when cold. I figure that a lot of the responses are put
out-of-band if conditions are even slightly abnormal for that old,
slow, processor. I think they used the Motorola 6800 in there - speed
demon it ain't.

I got hold of the pinouts and signal descriptions at the computer plug
a couple of years ago to build a breakout plug. I was (am) going to
profile all the signals with my laptop just to see if I could clone
the control system but got sidetracked before I got around to mashing
the disk full of data.

--
Will Honea

Will Honea

On Thu, 9 Sep 2004 04:10:37 UTC bllsht <nospam@invaliddot.net> wrote:

> >Like I said, after 3 years and 60K miles with the thing I've just
> >learned to release the clutch, tap the gas and live with that first
> >stop at the bottom of the hill.
>
> That's probably the fix right there. Going downhill using the engine to slow
> you down, the computer sees closed throttle but still a higher than normal idle
> speed. That'll make the computer shove the IAC out all the way to try to get
> the idle where it thinks it belongs. The computer has no idea the vehicle is
> moving or that the clutch is engaged, so it doesn't know any better. Then you
> disengage the clutch and the idle drops too much. Being that it's also cold
> just adds to the problem, and it can't recover in time to keep from stalling.
>
> Today's computers are a little smarter and have more info to work with. :-)

I've spent the last 40 years in and out of control system design -
usually a lot more complex than a consumer fuel system - and pretty
much decided that was the situation. That old Bendix computer is
early 80's technology (damn, I hope I never have to replace it!), it's
still in the open loop mode, and the moving parts are moving as slow
as I do when cold. I figure that a lot of the responses are put
out-of-band if conditions are even slightly abnormal for that old,
slow, processor. I think they used the Motorola 6800 in there - speed
demon it ain't.

I got hold of the pinouts and signal descriptions at the computer plug
a couple of years ago to build a breakout plug. I was (am) going to
profile all the signals with my laptop just to see if I could clone
the control system but got sidetracked before I got around to mashing
the disk full of data.

--
Will Honea

Will Honea

On Thu, 9 Sep 2004 04:10:37 UTC bllsht <nospam@invaliddot.net> wrote:

> >Like I said, after 3 years and 60K miles with the thing I've just
> >learned to release the clutch, tap the gas and live with that first
> >stop at the bottom of the hill.
>
> That's probably the fix right there. Going downhill using the engine to slow
> you down, the computer sees closed throttle but still a higher than normal idle
> speed. That'll make the computer shove the IAC out all the way to try to get
> the idle where it thinks it belongs. The computer has no idea the vehicle is
> moving or that the clutch is engaged, so it doesn't know any better. Then you
> disengage the clutch and the idle drops too much. Being that it's also cold
> just adds to the problem, and it can't recover in time to keep from stalling.
>
> Today's computers are a little smarter and have more info to work with. :-)

I've spent the last 40 years in and out of control system design -
usually a lot more complex than a consumer fuel system - and pretty
much decided that was the situation. That old Bendix computer is
early 80's technology (damn, I hope I never have to replace it!), it's
still in the open loop mode, and the moving parts are moving as slow
as I do when cold. I figure that a lot of the responses are put
out-of-band if conditions are even slightly abnormal for that old,
slow, processor. I think they used the Motorola 6800 in there - speed
demon it ain't.

I got hold of the pinouts and signal descriptions at the computer plug
a couple of years ago to build a breakout plug. I was (am) going to
profile all the signals with my laptop just to see if I could clone
the control system but got sidetracked before I got around to mashing
the disk full of data.

--
Will Honea

M. E. Bye

On Mon, 06 Sep 2004 21:08:33 -0500, M. E. Bye <fxdyna@hotmail.com>
wrote:

>On Mon, 06 Sep 2004 23:42:31 GMT, "Joseph P" <jpribe@nc.rr.com> wrote:
>
>>M. E. Bye wrote:
>>| On Sat, 04 Sep 2004 07:20:47 -0500, M. E. Bye <fxdyna@hotmail.com>
>>| wrote:
>>|
>>|| On Wed, 01 Sep 2004 17:39:45 -0500, M. E. Bye
>>|| <fxdyna@hotmail.com> wrote:
>>||
>>||| About a week ago, my '98 TJ (2.5L, 5-speed, 71K miles) began
>>||| missing at highway speed, bucking like a bronco. I chalked it
>>||| up to a bad tank of gas, so I dumped in a bottle of HEET and a
>>||| bottle of fuel injector cleaner. The problem continued, so I
>>||| did the same thing with my next fill-up at a different station.
>>||| No improvement. Since then, I've changed the plugs, installed
>>||| new wires, distributor cap and rotor, have cleaned the throttle
>>||| body, and have disconnected all electrical connections to the
>>||| throttle body and fuel injectors and have sprayed electrical
>>||| contact cleaner on them. I still have an intermittent miss at
>>||| speed. Not as severe as before, but I still have the problem.
>>||| What's next?
>>|||
>>||| Thanks in advance for any assistance!
>>|||
>>||| Mark
>>||| '98 TJ
>>||| '98 XJ
>>||
>>|| Well, by cracky, it's fixed. It didn't come about without a
>>|| story, though. I took off from work at noon yesterday (Friday)
>>|| and set out to my local AutoZone store to drop about $150 on new
>>|| oxygen sensors. En route, something happened that hadn't before.
>>|| Specifically my "CHECK ENGINE" light came on. Now I KNEW that I
>>|| had to have some sort of codes that would display (none did the
>>|| previous day when my buddy plugged in his code reader). So,
>>|| when I got to AutoZone, I asked the counter guy if he had a code
>>|| reader, which he did. He checked it and got a code "TPS/Pedal
>>|| Travel Sensor". Well, neither one of us knew what a Pedal
>>|| Travel Sensor was, but both knew what a TPS was. However, the
>>|| counter guy still suggests strongly that I've got a fuel filter
>>|| problem and that should be my priority fix. I thanked him and
>>|| decided that it was now time to go see the Jeep repair guy at a
>>|| dealership. Drove crosstown and talked with the Jeep technician
>>|| who really felt it was the throttle position sensor, so I went
>>|| to their parts counter and asked if they had one. Nope, but
>>|| they could order it. I had 'em check with a dealership 35 miles
>>|| down the road. They had 3 of 'em. I got on the cellphone and
>>|| asked them to hold one, I'd be right there. An hour later, I've
>>|| got the new one on and everything is back to normal! Now I can
>>|| get back to spending $$$ on my Jeep for fun things.
>>||
>>|| Thanks to everyone who provided assistance with this.
>>||
>>|| Mark
>>|| '98 TJ
>>|| '98 XJ
>>|
>>| Took a long ccruise with it yesterday. Ran just fine. Got home
>>| and it started bucking severely as I was slowing to a stop. Kind
>>| of like you didn't let the clutch out coming to a stop. It died,
>>| but I was able to start it again. A few miles down the road, it
>>| bucked again when taking off from a stop (this time, like letting
>>| the clutch out too quickly when taking off). I got home with it
>>| ok, tho. Today, it turns over but won't fire at all. What now?
>>|
>>| Mark
>>
>>
>>I may have missed it, but how many miles are on it?
>
>Just over 71,000. At this point, I'm thinking crank position sensor?
>
>Mark

Yup. Crank position sensor. Once I found it and removed it, I
discovered that the wiring was badly burned at the mid point. I'm
guessing that when the guy who put on a header replacing the bad
exhaust manifold a couple years ago didn't bother about where the
wiring from the connector to the sensor was routed.

Mark
'98 TJ
'98 XJ

M. E. Bye

On Mon, 06 Sep 2004 21:08:33 -0500, M. E. Bye <fxdyna@hotmail.com>
wrote:

>On Mon, 06 Sep 2004 23:42:31 GMT, "Joseph P" <jpribe@nc.rr.com> wrote:
>
>>M. E. Bye wrote:
>>| On Sat, 04 Sep 2004 07:20:47 -0500, M. E. Bye <fxdyna@hotmail.com>
>>| wrote:
>>|
>>|| On Wed, 01 Sep 2004 17:39:45 -0500, M. E. Bye
>>|| <fxdyna@hotmail.com> wrote:
>>||
>>||| About a week ago, my '98 TJ (2.5L, 5-speed, 71K miles) began
>>||| missing at highway speed, bucking like a bronco. I chalked it
>>||| up to a bad tank of gas, so I dumped in a bottle of HEET and a
>>||| bottle of fuel injector cleaner. The problem continued, so I
>>||| did the same thing with my next fill-up at a different station.
>>||| No improvement. Since then, I've changed the plugs, installed
>>||| new wires, distributor cap and rotor, have cleaned the throttle
>>||| body, and have disconnected all electrical connections to the
>>||| throttle body and fuel injectors and have sprayed electrical
>>||| contact cleaner on them. I still have an intermittent miss at
>>||| speed. Not as severe as before, but I still have the problem.
>>||| What's next?
>>|||
>>||| Thanks in advance for any assistance!
>>|||
>>||| Mark
>>||| '98 TJ
>>||| '98 XJ
>>||
>>|| Well, by cracky, it's fixed. It didn't come about without a
>>|| story, though. I took off from work at noon yesterday (Friday)
>>|| and set out to my local AutoZone store to drop about $150 on new
>>|| oxygen sensors. En route, something happened that hadn't before.
>>|| Specifically my "CHECK ENGINE" light came on. Now I KNEW that I
>>|| had to have some sort of codes that would display (none did the
>>|| previous day when my buddy plugged in his code reader). So,
>>|| when I got to AutoZone, I asked the counter guy if he had a code
>>|| reader, which he did. He checked it and got a code "TPS/Pedal
>>|| Travel Sensor". Well, neither one of us knew what a Pedal
>>|| Travel Sensor was, but both knew what a TPS was. However, the
>>|| counter guy still suggests strongly that I've got a fuel filter
>>|| problem and that should be my priority fix. I thanked him and
>>|| decided that it was now time to go see the Jeep repair guy at a
>>|| dealership. Drove crosstown and talked with the Jeep technician
>>|| who really felt it was the throttle position sensor, so I went
>>|| to their parts counter and asked if they had one. Nope, but
>>|| they could order it. I had 'em check with a dealership 35 miles
>>|| down the road. They had 3 of 'em. I got on the cellphone and
>>|| asked them to hold one, I'd be right there. An hour later, I've
>>|| got the new one on and everything is back to normal! Now I can
>>|| get back to spending $$$ on my Jeep for fun things.
>>||
>>|| Thanks to everyone who provided assistance with this.
>>||
>>|| Mark
>>|| '98 TJ
>>|| '98 XJ
>>|
>>| Took a long ccruise with it yesterday. Ran just fine. Got home
>>| and it started bucking severely as I was slowing to a stop. Kind
>>| of like you didn't let the clutch out coming to a stop. It died,
>>| but I was able to start it again. A few miles down the road, it
>>| bucked again when taking off from a stop (this time, like letting
>>| the clutch out too quickly when taking off). I got home with it
>>| ok, tho. Today, it turns over but won't fire at all. What now?
>>|
>>| Mark
>>
>>
>>I may have missed it, but how many miles are on it?
>
>Just over 71,000. At this point, I'm thinking crank position sensor?
>
>Mark

Yup. Crank position sensor. Once I found it and removed it, I
discovered that the wiring was badly burned at the mid point. I'm
guessing that when the guy who put on a header replacing the bad
exhaust manifold a couple years ago didn't bother about where the
wiring from the connector to the sensor was routed.

Mark
'98 TJ
'98 XJ

M. E. Bye

On Mon, 06 Sep 2004 21:08:33 -0500, M. E. Bye <fxdyna@hotmail.com>
wrote:

>On Mon, 06 Sep 2004 23:42:31 GMT, "Joseph P" <jpribe@nc.rr.com> wrote:
>
>>M. E. Bye wrote:
>>| On Sat, 04 Sep 2004 07:20:47 -0500, M. E. Bye <fxdyna@hotmail.com>
>>| wrote:
>>|
>>|| On Wed, 01 Sep 2004 17:39:45 -0500, M. E. Bye
>>|| <fxdyna@hotmail.com> wrote:
>>||
>>||| About a week ago, my '98 TJ (2.5L, 5-speed, 71K miles) began
>>||| missing at highway speed, bucking like a bronco. I chalked it
>>||| up to a bad tank of gas, so I dumped in a bottle of HEET and a
>>||| bottle of fuel injector cleaner. The problem continued, so I
>>||| did the same thing with my next fill-up at a different station.
>>||| No improvement. Since then, I've changed the plugs, installed
>>||| new wires, distributor cap and rotor, have cleaned the throttle
>>||| body, and have disconnected all electrical connections to the
>>||| throttle body and fuel injectors and have sprayed electrical
>>||| contact cleaner on them. I still have an intermittent miss at
>>||| speed. Not as severe as before, but I still have the problem.
>>||| What's next?
>>|||
>>||| Thanks in advance for any assistance!
>>|||
>>||| Mark
>>||| '98 TJ
>>||| '98 XJ
>>||
>>|| Well, by cracky, it's fixed. It didn't come about without a
>>|| story, though. I took off from work at noon yesterday (Friday)
>>|| and set out to my local AutoZone store to drop about $150 on new
>>|| oxygen sensors. En route, something happened that hadn't before.
>>|| Specifically my "CHECK ENGINE" light came on. Now I KNEW that I
>>|| had to have some sort of codes that would display (none did the
>>|| previous day when my buddy plugged in his code reader). So,
>>|| when I got to AutoZone, I asked the counter guy if he had a code
>>|| reader, which he did. He checked it and got a code "TPS/Pedal
>>|| Travel Sensor". Well, neither one of us knew what a Pedal
>>|| Travel Sensor was, but both knew what a TPS was. However, the
>>|| counter guy still suggests strongly that I've got a fuel filter
>>|| problem and that should be my priority fix. I thanked him and
>>|| decided that it was now time to go see the Jeep repair guy at a
>>|| dealership. Drove crosstown and talked with the Jeep technician
>>|| who really felt it was the throttle position sensor, so I went
>>|| to their parts counter and asked if they had one. Nope, but
>>|| they could order it. I had 'em check with a dealership 35 miles
>>|| down the road. They had 3 of 'em. I got on the cellphone and
>>|| asked them to hold one, I'd be right there. An hour later, I've
>>|| got the new one on and everything is back to normal! Now I can
>>|| get back to spending $$$ on my Jeep for fun things.
>>||
>>|| Thanks to everyone who provided assistance with this.
>>||
>>|| Mark
>>|| '98 TJ
>>|| '98 XJ
>>|
>>| Took a long ccruise with it yesterday. Ran just fine. Got home
>>| and it started bucking severely as I was slowing to a stop. Kind
>>| of like you didn't let the clutch out coming to a stop. It died,
>>| but I was able to start it again. A few miles down the road, it
>>| bucked again when taking off from a stop (this time, like letting
>>| the clutch out too quickly when taking off). I got home with it
>>| ok, tho. Today, it turns over but won't fire at all. What now?
>>|
>>| Mark
>>
>>
>>I may have missed it, but how many miles are on it?
>
>Just over 71,000. At this point, I'm thinking crank position sensor?
>
>Mark

Yup. Crank position sensor. Once I found it and removed it, I
discovered that the wiring was badly burned at the mid point. I'm
guessing that when the guy who put on a header replacing the bad
exhaust manifold a couple years ago didn't bother about where the
wiring from the connector to the sensor was routed.

Mark
'98 TJ
'98 XJ

DougW

M. E. Bye did pass the time by typing:

> Yup. Crank position sensor. Once I found it and removed it, I
> discovered that the wiring was badly burned at the mid point. I'm
> guessing that when the guy who put on a header replacing the bad
> exhaust manifold a couple years ago didn't bother about where the
> wiring from the connector to the sensor was routed.

Owtch.

You might be able to recover the sensor by splicing new wire but
that one is a bit tricky. Hopefully it didn't harm the computer.

--
DougW

DougW

M. E. Bye did pass the time by typing:

> Yup. Crank position sensor. Once I found it and removed it, I
> discovered that the wiring was badly burned at the mid point. I'm
> guessing that when the guy who put on a header replacing the bad
> exhaust manifold a couple years ago didn't bother about where the
> wiring from the connector to the sensor was routed.

Owtch.

You might be able to recover the sensor by splicing new wire but
that one is a bit tricky. Hopefully it didn't harm the computer.

--
DougW