Re: '97 XJ won't start...and no codes
 

Thanks for the suggestion. If the CPS was indeed bad, would i get a
spark still? Or is that another indication that it could be the CPS?

thanks,

Sandy

Re: '97 XJ won't start...and no codes
 

Thanks for the suggestion. If the CPS was indeed bad, would i get a
spark still? Or is that another indication that it could be the CPS?

thanks,

Sandy

Re: '97 XJ won't start...and no codes
 

Thanks for the suggestion. If the CPS was indeed bad, would i get a
spark still? Or is that another indication that it could be the CPS?

thanks,

Sandy

Re: '97 XJ won't start...and no codes
 

milk wrote:
> Thanks for the suggestion. If the CPS was indeed bad, would i get a
> spark still? Or is that another indication that it could be the CPS?

Yes, you would still get a spark, but only a few before the
computer detected no CPS signal and removes power to the coil.

You need to check for spark.

--
DougW

Re: '97 XJ won't start...and no codes
 

milk wrote:
> Thanks for the suggestion. If the CPS was indeed bad, would i get a
> spark still? Or is that another indication that it could be the CPS?

Yes, you would still get a spark, but only a few before the
computer detected no CPS signal and removes power to the coil.

You need to check for spark.

--
DougW

Re: '97 XJ won't start...and no codes
 

milk wrote:
> Thanks for the suggestion. If the CPS was indeed bad, would i get a
> spark still? Or is that another indication that it could be the CPS?

Yes, you would still get a spark, but only a few before the
computer detected no CPS signal and removes power to the coil.

You need to check for spark.

--
DougW

Re: '97 XJ won't start...and no codes
 

milk wrote:
> Thanks for the suggestion. If the CPS was indeed bad, would i get a
> spark still? Or is that another indication that it could be the CPS?

Yes, you would still get a spark, but only a few before the
computer detected no CPS signal and removes power to the coil.

You need to check for spark.

--
DougW

Re: '97 XJ won't start...and no codes
 

Mike Romain wrote:

> If the main ground for the body goes bad, the computer won't turn on.
> On the older ones, this is a mesh strap from the rear of the engine head
> to the firewall.
>
> There are more computer grounds on a bolt by the dipstick.

Wasn't 97 the year that the on-of-on-off-on trick wouldn't display codes?
There was a short run of those AIR. BTW, which engine? Most of the rest of
this assumes the 4.0L six.

Ground strap first, fuel pressure second: do you hear the pump when you turn
the key on (before the starter engages)? Remove the cap and press the pin
in the center of the schrader valve on the fuel rail (use a rag) to see if
it's holding any pressure. Unplug and re-plug the CPS connector - they
lose contact, so clean it with contact cleaner or WD40.

Use a spare plug and check for spark on one or more plug wires, come back
for more ideas once we have a better idea of what is/is not happening.

--
Will Honea

Re: '97 XJ won't start...and no codes
 

Mike Romain wrote:

> If the main ground for the body goes bad, the computer won't turn on.
> On the older ones, this is a mesh strap from the rear of the engine head
> to the firewall.
>
> There are more computer grounds on a bolt by the dipstick.

Wasn't 97 the year that the on-of-on-off-on trick wouldn't display codes?
There was a short run of those AIR. BTW, which engine? Most of the rest of
this assumes the 4.0L six.

Ground strap first, fuel pressure second: do you hear the pump when you turn
the key on (before the starter engages)? Remove the cap and press the pin
in the center of the schrader valve on the fuel rail (use a rag) to see if
it's holding any pressure. Unplug and re-plug the CPS connector - they
lose contact, so clean it with contact cleaner or WD40.

Use a spare plug and check for spark on one or more plug wires, come back
for more ideas once we have a better idea of what is/is not happening.

--
Will Honea

Re: '97 XJ won't start...and no codes
 

Mike Romain wrote:

> If the main ground for the body goes bad, the computer won't turn on.
> On the older ones, this is a mesh strap from the rear of the engine head
> to the firewall.
>
> There are more computer grounds on a bolt by the dipstick.

Wasn't 97 the year that the on-of-on-off-on trick wouldn't display codes?
There was a short run of those AIR. BTW, which engine? Most of the rest of
this assumes the 4.0L six.

Ground strap first, fuel pressure second: do you hear the pump when you turn
the key on (before the starter engages)? Remove the cap and press the pin
in the center of the schrader valve on the fuel rail (use a rag) to see if
it's holding any pressure. Unplug and re-plug the CPS connector - they
lose contact, so clean it with contact cleaner or WD40.

Use a spare plug and check for spark on one or more plug wires, come back
for more ideas once we have a better idea of what is/is not happening.

--
Will Honea