All,

Thanks to Bill & Mike for the help last time. This is getting silly. I
replaced the fuel injector, and the problem changed. At first, everything
was fine. After running it for a while (~20 minutes), it developed another
problem. If I'm not in gear, the engine runs smooth, no matter if I rev
the engine up or just let it idle. The moment I try to move forward (it's
a manual), the engine sounds like it's missing on a cylinder again. But if
drive in reverse, the problem doesn't occur.

Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
there's a sensor that tells the CPU whether or not the Jeep is moving.
This seems to tie it to the speed sensor somehow, as I don't think the
speedometer cable (and hence the speed sensor) turn when in reverse.

I don't think I got a bad injector, as it works fine in all conditions but
going forward. I don't think the speed sensor went out on me, because it
seems to me that the engine would run just like it did while in reverse.
Is the CPU partially dead? I tried power cycling it, but that had no
effect - maybe a trip to the bone yard is in order. I guess I should check
for pinched wires or a bad ground. I don't want to drive it much, because
if it's the computer, it could fry the injector again. Or maybe this is
the occasion I borrow the oscilloscope from work :).

As you can tell, I'm still trying to figure this out. Any help would be
greatly appreciated. Thanks in advance.
--
Michael White "To protect people from the effects of folly is to
fill the world with fools." -Herbert Spencer, 1891

 

Replace your ignition coil. And yes the oscilloscope will easily
see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891

 

Replace your ignition coil. And yes the oscilloscope will easily
see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891

 

Replace your ignition coil. And yes the oscilloscope will easily
see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891

 

Bill,

It didn't make a difference last time. I still have the old coil - I can
slap it on to see if it makes a difference. Again, though, if it was the
coil, I'd expect to see the problem when I was in forward -and- in reverse,
not just forward.

Thanks.
--
Michael White "To protect people from the effects of folly is to
fill the world with fools." -Herbert Spencer, 1891

L.W.(ßill) ------ III (----------@***.net) wrote on Saturday 02 October 2004
11:07 pm:

> Replace your ignition coil. And yes the oscilloscope will easily
> see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Michael White wrote:
>>
>> All,
>>
>> Thanks to Bill & Mike for the help last time. This is getting silly. I
>> replaced the fuel injector, and the problem changed. At first,
>> everything
>> was fine. After running it for a while (~20 minutes), it developed
>> another
>> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
>> the engine up or just let it idle. The moment I try to move forward
>> (it's
>> a manual), the engine sounds like it's missing on a cylinder again. But
>> if drive in reverse, the problem doesn't occur.
>>
>> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I
>> know there's a sensor that tells the CPU whether or not the Jeep is
>> moving. This seems to tie it to the speed sensor somehow, as I don't
>> think the speedometer cable (and hence the speed sensor) turn when in
>> reverse.
>>
>> I don't think I got a bad injector, as it works fine in all conditions
>> but
>> going forward. I don't think the speed sensor went out on me, because it
>> seems to me that the engine would run just like it did while in reverse.
>> Is the CPU partially dead? I tried power cycling it, but that had no
>> effect - maybe a trip to the bone yard is in order. I guess I should
>> check
>> for pinched wires or a bad ground. I don't want to drive it much,
>> because
>> if it's the computer, it could fry the injector again. Or maybe this is
>> the occasion I borrow the oscilloscope from work :).
>>
>> As you can tell, I'm still trying to figure this out. Any help would be
>> greatly appreciated. Thanks in advance.
>> --
>> Michael White "To protect people from the effects of folly is to
>> fill the world with fools." -Herbert Spencer, 1891

 

Bill,

It didn't make a difference last time. I still have the old coil - I can
slap it on to see if it makes a difference. Again, though, if it was the
coil, I'd expect to see the problem when I was in forward -and- in reverse,
not just forward.

Thanks.
--
Michael White "To protect people from the effects of folly is to
fill the world with fools." -Herbert Spencer, 1891

L.W.(ßill) ------ III (----------@***.net) wrote on Saturday 02 October 2004
11:07 pm:

> Replace your ignition coil. And yes the oscilloscope will easily
> see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Michael White wrote:
>>
>> All,
>>
>> Thanks to Bill & Mike for the help last time. This is getting silly. I
>> replaced the fuel injector, and the problem changed. At first,
>> everything
>> was fine. After running it for a while (~20 minutes), it developed
>> another
>> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
>> the engine up or just let it idle. The moment I try to move forward
>> (it's
>> a manual), the engine sounds like it's missing on a cylinder again. But
>> if drive in reverse, the problem doesn't occur.
>>
>> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I
>> know there's a sensor that tells the CPU whether or not the Jeep is
>> moving. This seems to tie it to the speed sensor somehow, as I don't
>> think the speedometer cable (and hence the speed sensor) turn when in
>> reverse.
>>
>> I don't think I got a bad injector, as it works fine in all conditions
>> but
>> going forward. I don't think the speed sensor went out on me, because it
>> seems to me that the engine would run just like it did while in reverse.
>> Is the CPU partially dead? I tried power cycling it, but that had no
>> effect - maybe a trip to the bone yard is in order. I guess I should
>> check
>> for pinched wires or a bad ground. I don't want to drive it much,
>> because
>> if it's the computer, it could fry the injector again. Or maybe this is
>> the occasion I borrow the oscilloscope from work :).
>>
>> As you can tell, I'm still trying to figure this out. Any help would be
>> greatly appreciated. Thanks in advance.
>> --
>> Michael White "To protect people from the effects of folly is to
>> fill the world with fools." -Herbert Spencer, 1891

 

Bill,

It didn't make a difference last time. I still have the old coil - I can
slap it on to see if it makes a difference. Again, though, if it was the
coil, I'd expect to see the problem when I was in forward -and- in reverse,
not just forward.

Thanks.
--
Michael White "To protect people from the effects of folly is to
fill the world with fools." -Herbert Spencer, 1891

L.W.(ßill) ------ III (----------@***.net) wrote on Saturday 02 October 2004
11:07 pm:

> Replace your ignition coil. And yes the oscilloscope will easily
> see it: http://www.----------.com/oscilloscopeIgnitionTest.jpg
> God Bless America, ßill O|||||||O
> mailto:--------------------
>
> Michael White wrote:
>>
>> All,
>>
>> Thanks to Bill & Mike for the help last time. This is getting silly. I
>> replaced the fuel injector, and the problem changed. At first,
>> everything
>> was fine. After running it for a while (~20 minutes), it developed
>> another
>> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
>> the engine up or just let it idle. The moment I try to move forward
>> (it's
>> a manual), the engine sounds like it's missing on a cylinder again. But
>> if drive in reverse, the problem doesn't occur.
>>
>> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I
>> know there's a sensor that tells the CPU whether or not the Jeep is
>> moving. This seems to tie it to the speed sensor somehow, as I don't
>> think the speedometer cable (and hence the speed sensor) turn when in
>> reverse.
>>
>> I don't think I got a bad injector, as it works fine in all conditions
>> but
>> going forward. I don't think the speed sensor went out on me, because it
>> seems to me that the engine would run just like it did while in reverse.
>> Is the CPU partially dead? I tried power cycling it, but that had no
>> effect - maybe a trip to the bone yard is in order. I guess I should
>> check
>> for pinched wires or a bad ground. I don't want to drive it much,
>> because
>> if it's the computer, it could fry the injector again. Or maybe this is
>> the occasion I borrow the oscilloscope from work :).
>>
>> As you can tell, I'm still trying to figure this out. Any help would be
>> greatly appreciated. Thanks in advance.
>> --
>> Michael White "To protect people from the effects of folly is to
>> fill the world with fools." -Herbert Spencer, 1891

 

Crapping out in one direction sure implies a loose or pinched connection
to me.

How is the ground from the engine head to the firewall? If punky it can
act like that by not allowing enough power to the computer to fire up
everything.

Or more likely it is stealing a ground through your throttle cable or
linkage which gets loose when the engine twists slightly under load.

Just wild guesses.

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

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891

 

Crapping out in one direction sure implies a loose or pinched connection
to me.

How is the ground from the engine head to the firewall? If punky it can
act like that by not allowing enough power to the computer to fire up
everything.

Or more likely it is stealing a ground through your throttle cable or
linkage which gets loose when the engine twists slightly under load.

Just wild guesses.

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

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891

 

Crapping out in one direction sure implies a loose or pinched connection
to me.

How is the ground from the engine head to the firewall? If punky it can
act like that by not allowing enough power to the computer to fire up
everything.

Or more likely it is stealing a ground through your throttle cable or
linkage which gets loose when the engine twists slightly under load.

Just wild guesses.

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

Michael White wrote:
>
> All,
>
> Thanks to Bill & Mike for the help last time. This is getting silly. I
> replaced the fuel injector, and the problem changed. At first, everything
> was fine. After running it for a while (~20 minutes), it developed another
> problem. If I'm not in gear, the engine runs smooth, no matter if I rev
> the engine up or just let it idle. The moment I try to move forward (it's
> a manual), the engine sounds like it's missing on a cylinder again. But if
> drive in reverse, the problem doesn't occur.
>
> Again, this is an '82 Scrambler with the Mopar fuel injection kit. I know
> there's a sensor that tells the CPU whether or not the Jeep is moving.
> This seems to tie it to the speed sensor somehow, as I don't think the
> speedometer cable (and hence the speed sensor) turn when in reverse.
>
> I don't think I got a bad injector, as it works fine in all conditions but
> going forward. I don't think the speed sensor went out on me, because it
> seems to me that the engine would run just like it did while in reverse.
> Is the CPU partially dead? I tried power cycling it, but that had no
> effect - maybe a trip to the bone yard is in order. I guess I should check
> for pinched wires or a bad ground. I don't want to drive it much, because
> if it's the computer, it could fry the injector again. Or maybe this is
> the occasion I borrow the oscilloscope from work :).
>
> As you can tell, I'm still trying to figure this out. Any help would be
> greatly appreciated. Thanks in advance.
> --
> Michael White "To protect people from the effects of folly is to
> fill the world with fools." -Herbert Spencer, 1891