RK

Hey -
Got a question for all of your gearheads out there that my local
mechanic shop can't seem to diagnose...
I have an 86 CJ7. Excellent mechanical shape. Recently, I started
having a problem, where the engine would just die - usually when I was
reducing speed and coming up on a red light or making a turn. It
started to get a little more frequent, so I first replaced the fuel
filter. Then, I replaced the fuel pump. Then, I took the carb in
(Holley) and had it rebuilt (it needed it anyway). I've also replaced
the Ignition Control Module. NONE of these have fixed the problem.
Now, after the vehicle has been running for about 10 minutes, it will
"bog down" - it will just start to decrease in power until it stalls.
If I push the clutch in and rev the gas pedal, it will sputter and
choke. To get it restarted, I'll have to wait a few minutes at least
before it will start (turns over fine, just won't start).
The vehilce will idle all day long without a problem. It only is a
problem under load.
I was told by the carb guy that it may be the "sock" in the gas tank
(clogged). My mechanic tells me No. In looking in Chilton's, it ssays
it may be a vacuum leak, although the mechanic is telling me no to this
as well.....Any thoughts?!?!
I'm fresh out of ideas! Help!!!
Post here or email me at rkeller8@tampabay.rr.com

Mike Romain

When was the last time you changed the air filter on the gas tank vent?

A plugged one will cause your symptoms by putting a vacuum on the gas
tank.

The air filter is a couple bucks and is located on the bottom of the
charcoal canister. It is a real bugger to change the first time, it is
press fitted in and will likely need to be dug out. I needed a hammer
and chisel on mine...

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

RK wrote:
>
> Hey -
> Got a question for all of your gearheads out there that my local
> mechanic shop can't seem to diagnose...
> I have an 86 CJ7. Excellent mechanical shape. Recently, I started
> having a problem, where the engine would just die - usually when I was
> reducing speed and coming up on a red light or making a turn. It
> started to get a little more frequent, so I first replaced the fuel
> filter. Then, I replaced the fuel pump. Then, I took the carb in
> (Holley) and had it rebuilt (it needed it anyway). I've also replaced
> the Ignition Control Module. NONE of these have fixed the problem.
> Now, after the vehicle has been running for about 10 minutes, it will
> "bog down" - it will just start to decrease in power until it stalls.
> If I push the clutch in and rev the gas pedal, it will sputter and
> choke. To get it restarted, I'll have to wait a few minutes at least
> before it will start (turns over fine, just won't start).
> The vehilce will idle all day long without a problem. It only is a
> problem under load.
> I was told by the carb guy that it may be the "sock" in the gas tank
> (clogged). My mechanic tells me No. In looking in Chilton's, it ssays
> it may be a vacuum leak, although the mechanic is telling me no to this
> as well.....Any thoughts?!?!
> I'm fresh out of ideas! Help!!!
> Post here or email me at rkeller8@tampabay.rr.com

Mike Romain

I check the canister filter by driving with a loose or off gas cap. If
the problem goes away, bingo.

There have been many trips home for me with a loose gas cap after
'playing' in the local mud pit.

A plugged filter does the sweetest imitation of running out of gas you
ever want to see...

Mike

RK wrote:
>
> Thanks for the suggestions - I will speak with the mechanic on Monday
> and see what he thinks. In the interim, they took off the fuel line and
> the return line and blew them out, just in case their was a blockage
> somewhere. Everything was a bit dirty, but otherwise passable.
> As for the charcoal canister - yikes. I didn't even realize that it was
> an integral part of the system - just thought it was emissions related.
> I'll check it.
> As for the rest - the vehicle is highly maintained. Oil filter, oil, air
> filter and fuel filter changed regularly.
> Keep the suggestions coming!
> Ron
>
> RK wrote:
> > Hey -
> > Got a question for all of your gearheads out there that my local
> > mechanic shop can't seem to diagnose...
> > I have an 86 CJ7. Excellent mechanical shape. Recently, I started
> > having a problem, where the engine would just die - usually when I was
> > reducing speed and coming up on a red light or making a turn. It
> > started to get a little more frequent, so I first replaced the fuel
> > filter. Then, I replaced the fuel pump. Then, I took the carb in
> > (Holley) and had it rebuilt (it needed it anyway). I've also replaced
> > the Ignition Control Module. NONE of these have fixed the problem.
> > Now, after the vehicle has been running for about 10 minutes, it will
> > "bog down" - it will just start to decrease in power until it stalls. If
> > I push the clutch in and rev the gas pedal, it will sputter and choke.
> > To get it restarted, I'll have to wait a few minutes at least before it
> > will start (turns over fine, just won't start).
> > The vehilce will idle all day long without a problem. It only is a
> > problem under load.
> > I was told by the carb guy that it may be the "sock" in the gas tank
> > (clogged). My mechanic tells me No. In looking in Chilton's, it ssays
> > it may be a vacuum leak, although the mechanic is telling me no to this
> > as well.....Any thoughts?!?!
> > I'm fresh out of ideas! Help!!!
> > Post here or email me at rkeller8@tampabay.rr.com
> >

RK

Well, I mentioned your suggestions to the mechanic, and he said he
checked that as well. He said that causes, in effect, vapor lock if
that happens, so he checked and it was not the culprit.
What they did do was put in Dry Gas and replace dthe fuel lines running
from and to the tank (said they were corroded). They then took the Jeep
on an extended (1hr) test drive and said they encountered no problems.
Of course - you all know what is going to happen. I'm going to pay my
bill, drive off and the next day it will happen again, stranding me
somewhere in BFE (I live in FLA, so its extra nice to be pushing your
Jeep home in a suit when its sunny and 99 degrees.....)
Guess I'd better lay out the cash and get AAA now, huh?
Thanks for all the advice - I'll keep ya posted!
Ron

Mike Romain wrote:
> I check the canister filter by driving with a loose or off gas cap. If
> the problem goes away, bingo.
>
> There have been many trips home for me with a loose gas cap after
> 'playing' in the local mud pit.
>
> A plugged filter does the sweetest imitation of running out of gas you
> ever want to see...
>
> Mike
>
> RK wrote:
>
>>Thanks for the suggestions - I will speak with the mechanic on Monday
>>and see what he thinks. In the interim, they took off the fuel line and
>>the return line and blew them out, just in case their was a blockage
>>somewhere. Everything was a bit dirty, but otherwise passable.
>>As for the charcoal canister - yikes. I didn't even realize that it was
>>an integral part of the system - just thought it was emissions related.
>>I'll check it.
>>As for the rest - the vehicle is highly maintained. Oil filter, oil, air
>>filter and fuel filter changed regularly.
>>Keep the suggestions coming!
>>Ron
>>
>>RK wrote:
>>
>>>Hey -
>>>Got a question for all of your gearheads out there that my local
>>>mechanic shop can't seem to diagnose...
>>>I have an 86 CJ7. Excellent mechanical shape. Recently, I started
>>>having a problem, where the engine would just die - usually when I was
>>>reducing speed and coming up on a red light or making a turn. It
>>>started to get a little more frequent, so I first replaced the fuel
>>>filter. Then, I replaced the fuel pump. Then, I took the carb in
>>>(Holley) and had it rebuilt (it needed it anyway). I've also replaced
>>>the Ignition Control Module. NONE of these have fixed the problem.
>>>Now, after the vehicle has been running for about 10 minutes, it will
>>>"bog down" - it will just start to decrease in power until it stalls. If
>>>I push the clutch in and rev the gas pedal, it will sputter and choke.
>>>To get it restarted, I'll have to wait a few minutes at least before it
>>>will start (turns over fine, just won't start).
>>>The vehilce will idle all day long without a problem. It only is a
>>>problem under load.
>>>I was told by the carb guy that it may be the "sock" in the gas tank
>>>(clogged). My mechanic tells me No. In looking in Chilton's, it ssays
>>>it may be a vacuum leak, although the mechanic is telling me no to this
>>>as well.....Any thoughts?!?!
>>>I'm fresh out of ideas! Help!!!
>>>Post here or email me at rkeller8@tampabay.rr.com
>>>