Re: Lost top end power in 88 Cherokee 4.0.
 

"L.W. (Bill) ------ III" <----------@cox.net> wrote
> Water in your float bowl.

With a TPS and IAC?
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

bllsht wrote:

>
> The anti drain back check valve in the pump will make it difficult, if
> not impossible to blow back through the pump. However, if it's easy to
> blow back through it would indicate the the rubber hose from the pump
> to the sending unit outlet has come loose or failed. Very common and
> most likely cause of the problem you describe.
>
> You could also be describing an ignition coil failure. Even if your
> measurements look good, and it appears to create a strong spark, it
> could still be shorted internally, causing your problem under load.
> You'd need a scope to see it though.
>
>

Nice try, thanks.

The pump holds blow back pressure.

It didn't have any pressure when the filter was unhooked though....

If the spark was messed, I would think I would see dirty plugs, not
perfect wear ones....

Do you or does anyone know if there a return line pressure valve on this
88 4.0 or is it just a metered hole?

I am thinking about pinching off the return line to see what happens....

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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

bllsht wrote:

>
> The anti drain back check valve in the pump will make it difficult, if
> not impossible to blow back through the pump. However, if it's easy to
> blow back through it would indicate the the rubber hose from the pump
> to the sending unit outlet has come loose or failed. Very common and
> most likely cause of the problem you describe.
>
> You could also be describing an ignition coil failure. Even if your
> measurements look good, and it appears to create a strong spark, it
> could still be shorted internally, causing your problem under load.
> You'd need a scope to see it though.
>
>

Nice try, thanks.

The pump holds blow back pressure.

It didn't have any pressure when the filter was unhooked though....

If the spark was messed, I would think I would see dirty plugs, not
perfect wear ones....

Do you or does anyone know if there a return line pressure valve on this
88 4.0 or is it just a metered hole?

I am thinking about pinching off the return line to see what happens....

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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

bllsht wrote:

>
> The anti drain back check valve in the pump will make it difficult, if
> not impossible to blow back through the pump. However, if it's easy to
> blow back through it would indicate the the rubber hose from the pump
> to the sending unit outlet has come loose or failed. Very common and
> most likely cause of the problem you describe.
>
> You could also be describing an ignition coil failure. Even if your
> measurements look good, and it appears to create a strong spark, it
> could still be shorted internally, causing your problem under load.
> You'd need a scope to see it though.
>
>

Nice try, thanks.

The pump holds blow back pressure.

It didn't have any pressure when the filter was unhooked though....

If the spark was messed, I would think I would see dirty plugs, not
perfect wear ones....

Do you or does anyone know if there a return line pressure valve on this
88 4.0 or is it just a metered hole?

I am thinking about pinching off the return line to see what happens....

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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

bllsht wrote:

>
> The anti drain back check valve in the pump will make it difficult, if
> not impossible to blow back through the pump. However, if it's easy to
> blow back through it would indicate the the rubber hose from the pump
> to the sending unit outlet has come loose or failed. Very common and
> most likely cause of the problem you describe.
>
> You could also be describing an ignition coil failure. Even if your
> measurements look good, and it appears to create a strong spark, it
> could still be shorted internally, causing your problem under load.
> You'd need a scope to see it though.
>
>

Nice try, thanks.

The pump holds blow back pressure.

It didn't have any pressure when the filter was unhooked though....

If the spark was messed, I would think I would see dirty plugs, not
perfect wear ones....

Do you or does anyone know if there a return line pressure valve on this
88 4.0 or is it just a metered hole?

I am thinking about pinching off the return line to see what happens....

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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

On Mon, 28 May 2007 19:47:08 -0400, Mike Romain <romainm@sympatico.ca>
wrote:

>bllsht wrote:
>
>>
>> The anti drain back check valve in the pump will make it difficult, if
>> not impossible to blow back through the pump. However, if it's easy to
>> blow back through it would indicate the the rubber hose from the pump
>> to the sending unit outlet has come loose or failed. Very common and
>> most likely cause of the problem you describe.
>>
>> You could also be describing an ignition coil failure. Even if your
>> measurements look good, and it appears to create a strong spark, it
>> could still be shorted internally, causing your problem under load.
>> You'd need a scope to see it though.
>>
>>
>
>Nice try, thanks.
>
>The pump holds blow back pressure.
>
>It didn't have any pressure when the filter was unhooked though....
>
>If the spark was messed, I would think I would see dirty plugs, not
>perfect wear ones....

Not necessarily.

>
>Do you or does anyone know if there a return line pressure valve on this
>88 4.0 or is it just a metered hole?
>
>I am thinking about pinching off the return line to see what happens....

The fuel pressure regulator is on the fuel rail at the front. It's a
spring loaded diaphragm with a vacuum hose attached to it. Spring
pressure determines fuel pressure. Vacuum assists in overcoming spring
pressure to open the bypass under low load (high vacuum) conditions.
On high load (low vacuum) it takes more fuel pressure to open the
bypass. The result is slightly higher fuel pressure under load.

Be careful pinching off the return line. You could easily end up
blowing off the hose I mentioned earlier.

You really need a fuel pressure gauge to see what's going on. An old
low side R12 gauge would work. Otherwise you're in for some guesswork.



>
>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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

On Mon, 28 May 2007 19:47:08 -0400, Mike Romain <romainm@sympatico.ca>
wrote:

>bllsht wrote:
>
>>
>> The anti drain back check valve in the pump will make it difficult, if
>> not impossible to blow back through the pump. However, if it's easy to
>> blow back through it would indicate the the rubber hose from the pump
>> to the sending unit outlet has come loose or failed. Very common and
>> most likely cause of the problem you describe.
>>
>> You could also be describing an ignition coil failure. Even if your
>> measurements look good, and it appears to create a strong spark, it
>> could still be shorted internally, causing your problem under load.
>> You'd need a scope to see it though.
>>
>>
>
>Nice try, thanks.
>
>The pump holds blow back pressure.
>
>It didn't have any pressure when the filter was unhooked though....
>
>If the spark was messed, I would think I would see dirty plugs, not
>perfect wear ones....

Not necessarily.

>
>Do you or does anyone know if there a return line pressure valve on this
>88 4.0 or is it just a metered hole?
>
>I am thinking about pinching off the return line to see what happens....

The fuel pressure regulator is on the fuel rail at the front. It's a
spring loaded diaphragm with a vacuum hose attached to it. Spring
pressure determines fuel pressure. Vacuum assists in overcoming spring
pressure to open the bypass under low load (high vacuum) conditions.
On high load (low vacuum) it takes more fuel pressure to open the
bypass. The result is slightly higher fuel pressure under load.

Be careful pinching off the return line. You could easily end up
blowing off the hose I mentioned earlier.

You really need a fuel pressure gauge to see what's going on. An old
low side R12 gauge would work. Otherwise you're in for some guesswork.



>
>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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

On Mon, 28 May 2007 19:47:08 -0400, Mike Romain <romainm@sympatico.ca>
wrote:

>bllsht wrote:
>
>>
>> The anti drain back check valve in the pump will make it difficult, if
>> not impossible to blow back through the pump. However, if it's easy to
>> blow back through it would indicate the the rubber hose from the pump
>> to the sending unit outlet has come loose or failed. Very common and
>> most likely cause of the problem you describe.
>>
>> You could also be describing an ignition coil failure. Even if your
>> measurements look good, and it appears to create a strong spark, it
>> could still be shorted internally, causing your problem under load.
>> You'd need a scope to see it though.
>>
>>
>
>Nice try, thanks.
>
>The pump holds blow back pressure.
>
>It didn't have any pressure when the filter was unhooked though....
>
>If the spark was messed, I would think I would see dirty plugs, not
>perfect wear ones....

Not necessarily.

>
>Do you or does anyone know if there a return line pressure valve on this
>88 4.0 or is it just a metered hole?
>
>I am thinking about pinching off the return line to see what happens....

The fuel pressure regulator is on the fuel rail at the front. It's a
spring loaded diaphragm with a vacuum hose attached to it. Spring
pressure determines fuel pressure. Vacuum assists in overcoming spring
pressure to open the bypass under low load (high vacuum) conditions.
On high load (low vacuum) it takes more fuel pressure to open the
bypass. The result is slightly higher fuel pressure under load.

Be careful pinching off the return line. You could easily end up
blowing off the hose I mentioned earlier.

You really need a fuel pressure gauge to see what's going on. An old
low side R12 gauge would work. Otherwise you're in for some guesswork.



>
>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)

Re: Lost top end power in 88 Cherokee 4.0.- Update
 

On Mon, 28 May 2007 19:47:08 -0400, Mike Romain <romainm@sympatico.ca>
wrote:

>bllsht wrote:
>
>>
>> The anti drain back check valve in the pump will make it difficult, if
>> not impossible to blow back through the pump. However, if it's easy to
>> blow back through it would indicate the the rubber hose from the pump
>> to the sending unit outlet has come loose or failed. Very common and
>> most likely cause of the problem you describe.
>>
>> You could also be describing an ignition coil failure. Even if your
>> measurements look good, and it appears to create a strong spark, it
>> could still be shorted internally, causing your problem under load.
>> You'd need a scope to see it though.
>>
>>
>
>Nice try, thanks.
>
>The pump holds blow back pressure.
>
>It didn't have any pressure when the filter was unhooked though....
>
>If the spark was messed, I would think I would see dirty plugs, not
>perfect wear ones....

Not necessarily.

>
>Do you or does anyone know if there a return line pressure valve on this
>88 4.0 or is it just a metered hole?
>
>I am thinking about pinching off the return line to see what happens....

The fuel pressure regulator is on the fuel rail at the front. It's a
spring loaded diaphragm with a vacuum hose attached to it. Spring
pressure determines fuel pressure. Vacuum assists in overcoming spring
pressure to open the bypass under low load (high vacuum) conditions.
On high load (low vacuum) it takes more fuel pressure to open the
bypass. The result is slightly higher fuel pressure under load.

Be careful pinching off the return line. You could easily end up
blowing off the hose I mentioned earlier.

You really need a fuel pressure gauge to see what's going on. An old
low side R12 gauge would work. Otherwise you're in for some guesswork.



>
>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)

Re: Lost top end power in 88 Cherokee 4.0.
 

There you go again, from the biggest loser of them all! The jealous,
really jealous, I can't believe how jealous this little draft dodging coward
schizophrenic psychopath liar hiding in Vancouver via
S0106000ea6ba70e7.vn.shawcable.net 24.86.24.251 intrepidator@shaw.ca who's
only way to get attention is to make a fool of it's self. With an obsession
with perverts and goats, where it writes via remailers, and cross posts to
other perverts to no one's surprise. With extreme jealous ranting over my
documents, possessions, successes, manliness and super Southern California
body. Committing forgery over many of them proving I'm a responsible
American man. You remind me of a little rat dog, like a Mexican Chiwawa with
it's senseless barking, me too, me too. You're even more senile than I first
thought. And the poor thing, you're too girlie to take responsibility for
yourself again, by signing your statement like a man.
You're not worth any more time when a cut and paste this same paragraph
it fits so well!
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/


"Jesus H. Chrysler, Esq." <jc@heaven.xxx.net> wrote in message
news:evx6i.230431$DE1.102887@pd7urf2no...
>
> And you are wrong.
>
> Again.
>
>
>
> [insert blather here]



--
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