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

On Sun, 27 May 2007 16:13:54 -0700, XS11E <xs11eNO@SPAMyahoo.com>
wrote:

>SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
>Don't disagree with you at all but the OP says he already replaced the
>fuel filter, my question: Is there another filter somewhere?
>
>I had a Cherokee years back but I no longer have the service manuals so
>I don't know if there is another filter.
>
>What about the fuel vent? That's easy to check by driving with the gas
>cap removed.


Fuel vent is viable too but more so with a fuller tank when there is
less air to expand as volume in tank increase. . If filter has been
changed then fuel pressure shuold be checked too and if you had a gage
with a long hose on it to could drive vehcile to failure mode and
check pressure while doing it and if pressure stays good than fuel
system can be ruled out but if it dropped then you have your culprit.
Also I am not sure if the is a screen or sock filter in tank on fuel
pickup on that model Jeep in regards to a second filter.
-----------------
TheSnoMan.com

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

On Sun, 27 May 2007 16:13:54 -0700, XS11E <xs11eNO@SPAMyahoo.com>
wrote:

>SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
>Don't disagree with you at all but the OP says he already replaced the
>fuel filter, my question: Is there another filter somewhere?
>
>I had a Cherokee years back but I no longer have the service manuals so
>I don't know if there is another filter.
>
>What about the fuel vent? That's easy to check by driving with the gas
>cap removed.


Fuel vent is viable too but more so with a fuller tank when there is
less air to expand as volume in tank increase. . If filter has been
changed then fuel pressure shuold be checked too and if you had a gage
with a long hose on it to could drive vehcile to failure mode and
check pressure while doing it and if pressure stays good than fuel
system can be ruled out but if it dropped then you have your culprit.
Also I am not sure if the is a screen or sock filter in tank on fuel
pickup on that model Jeep in regards to a second filter.
-----------------
TheSnoMan.com

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

On Sun, 27 May 2007 16:13:54 -0700, XS11E <xs11eNO@SPAMyahoo.com>
wrote:

>SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
>Don't disagree with you at all but the OP says he already replaced the
>fuel filter, my question: Is there another filter somewhere?
>
>I had a Cherokee years back but I no longer have the service manuals so
>I don't know if there is another filter.
>
>What about the fuel vent? That's easy to check by driving with the gas
>cap removed.


Fuel vent is viable too but more so with a fuller tank when there is
less air to expand as volume in tank increase. . If filter has been
changed then fuel pressure shuold be checked too and if you had a gage
with a long hose on it to could drive vehcile to failure mode and
check pressure while doing it and if pressure stays good than fuel
system can be ruled out but if it dropped then you have your culprit.
Also I am not sure if the is a screen or sock filter in tank on fuel
pickup on that model Jeep in regards to a second filter.
-----------------
TheSnoMan.com

Re: Lost top end power in 88 Cherokee 4.0.
 

XS11E wrote:
> SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
> Don't disagree with you at all but the OP says he already replaced the
> fuel filter, my question: Is there another filter somewhere?
>
> I had a Cherokee years back but I no longer have the service manuals so
> I don't know if there is another filter.
>
> What about the fuel vent? That's easy to check by driving with the gas
> cap removed.
>

There is a sock filter on the pump in the tank.

What would I explode if I try blowing back through the line from the
tank side of the inline filter.

The tank is new since we bought the Jeep, but...

I will go try some more up top electrical things first now.

Mike

Re: Lost top end power in 88 Cherokee 4.0.
 

XS11E wrote:
> SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
> Don't disagree with you at all but the OP says he already replaced the
> fuel filter, my question: Is there another filter somewhere?
>
> I had a Cherokee years back but I no longer have the service manuals so
> I don't know if there is another filter.
>
> What about the fuel vent? That's easy to check by driving with the gas
> cap removed.
>

There is a sock filter on the pump in the tank.

What would I explode if I try blowing back through the line from the
tank side of the inline filter.

The tank is new since we bought the Jeep, but...

I will go try some more up top electrical things first now.

Mike

Re: Lost top end power in 88 Cherokee 4.0.
 

XS11E wrote:
> SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
> Don't disagree with you at all but the OP says he already replaced the
> fuel filter, my question: Is there another filter somewhere?
>
> I had a Cherokee years back but I no longer have the service manuals so
> I don't know if there is another filter.
>
> What about the fuel vent? That's easy to check by driving with the gas
> cap removed.
>

There is a sock filter on the pump in the tank.

What would I explode if I try blowing back through the line from the
tank side of the inline filter.

The tank is new since we bought the Jeep, but...

I will go try some more up top electrical things first now.

Mike

Re: Lost top end power in 88 Cherokee 4.0.
 

XS11E wrote:
> SnoMan <admin@snoman.com> wrote:
>
>> Run it hard and make it bog and them pull over and remove a plug
>> and see if it is white or sooty. I tend to think you are getting a
>> fuel starvation here that surfaces at higher power settings. Hard
>> to be sure without feeling it but the plugs would confirm a lean
>> out. Might start by changing fuel filter like someone else
>> suggested and maybe a fuel pressure check too.
>
> Don't disagree with you at all but the OP says he already replaced the
> fuel filter, my question: Is there another filter somewhere?
>
> I had a Cherokee years back but I no longer have the service manuals so
> I don't know if there is another filter.
>
> What about the fuel vent? That's easy to check by driving with the gas
> cap removed.
>

There is a sock filter on the pump in the tank.

What would I explode if I try blowing back through the line from the
tank side of the inline filter.

The tank is new since we bought the Jeep, but...

I will go try some more up top electrical things first now.

Mike

Re: Lost top end power in 88 Cherokee 4.0.
 

Mike Romain <romainm@sympatico.ca> wrote:

> There is a sock filter on the pump in the tank.
>
> What would I explode if I try blowing back through the line from
> the tank side of the inline filter.

Give it a try, the worst that can happen is the tank and the gasoline
in it will detonate with enough force to destroy the known universe....

Seriously, remove the gas cap and blow back VERY gently, you should
hear bubbling in the tank, don't use a compressor, just blow into it,
compressed air might possibly damage the filter and/or pump.

> The tank is new since we bought the Jeep, but...
>
> I will go try some more up top electrical things first now.

It sure sounds like fuel starvation but it may not be?



--
XS11E, Killing all posts from Google Groups
The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html

Re: Lost top end power in 88 Cherokee 4.0.
 

Mike Romain <romainm@sympatico.ca> wrote:

> There is a sock filter on the pump in the tank.
>
> What would I explode if I try blowing back through the line from
> the tank side of the inline filter.

Give it a try, the worst that can happen is the tank and the gasoline
in it will detonate with enough force to destroy the known universe....

Seriously, remove the gas cap and blow back VERY gently, you should
hear bubbling in the tank, don't use a compressor, just blow into it,
compressed air might possibly damage the filter and/or pump.

> The tank is new since we bought the Jeep, but...
>
> I will go try some more up top electrical things first now.

It sure sounds like fuel starvation but it may not be?



--
XS11E, Killing all posts from Google Groups
The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html

Re: Lost top end power in 88 Cherokee 4.0.
 

Mike Romain <romainm@sympatico.ca> wrote:

> There is a sock filter on the pump in the tank.
>
> What would I explode if I try blowing back through the line from
> the tank side of the inline filter.

Give it a try, the worst that can happen is the tank and the gasoline
in it will detonate with enough force to destroy the known universe....

Seriously, remove the gas cap and blow back VERY gently, you should
hear bubbling in the tank, don't use a compressor, just blow into it,
compressed air might possibly damage the filter and/or pump.

> The tank is new since we bought the Jeep, but...
>
> I will go try some more up top electrical things first now.

It sure sounds like fuel starvation but it may not be?



--
XS11E, Killing all posts from Google Groups
The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html