Sputtering then stalls at 35 mph. - JeepForum.com

 
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post #1 of 10 Old 03-28-2013, 01:34 PM Thread Starter
noy2014
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1986 CJ7 
 
Join Date: Feb 2009
Location: Fort Lauderdale
Posts: 313
Sputtering then stalls at 35 mph.

Okay, I have to start another thread and see if I can clean up the existing situation.

Problem:
The Jeep will run fine for a few miles, then at about 35mph I will start to feel it lagging, and then it will start sputtering, and eventually stall. Just prior to stalling, I could either delay or avoid it if I let off the gas. Accelerating seems to just speed up the sputtering/stall time. At any time after a stall, I can wait a few minutes, then she starts back up immediately, and I can drive another few miles until it repeats itself.

Possibly Related:
- If the Jeep has been sitting for a few days, I can bet that when I start it up again, I will need to pump the gas peddle like 20-30 times before the gas gets to the carb. Once there the jeep starts instantaneously. If it just sits for a few hours, then I only need 5-7 pumps of gas. So obviously the gas is falling back into the tank.

- This most recent time that it stalled, I noticed some oily/greasy residue on the inside of one barrel of the carb. Yesterday after a stall, I restarted it and I saw some vapor/gas coming out of the bottom of the barrel when I was playing with the throttle linkage.

To me this could be pointing to the carb not getting a steady supply of fuel, again at about 35mph AND/OR an oil-gas mixture is off.

History:
About 4 months ago, I started driving it again every so often after it was sitting for nearly 2 years, ...so perhaps the carb needs to be rebuilt? The fuel tank has recently been restored with new hoses, as well as new hoses and filter in the engine. All sparkplugs were recently changes with standard Champions.

This guys seems to have had a similar problem;
http://www.jeepforum.com/forum/f8/ba...-pump-1022858/


So do I go for a fuel pump replacement, rebuild the carb, or what??



Some of my previous posts about this;
http://www.jeepforum.com/forum/f8/ca...lated-1475567/
http://www.jeepforum.com/forum/f8/ca...meter-1476755/


_


"The new born" 2009 Sahara Unlimited - MyGig / Navigation, 35"x12.5" R20 on Teraflex 3" Spring Lift
"Grampa" 1986 CJ7 - 258 6cyl; Weber Carb 32/36 DGEV; Painless Harness replacement, 33" BFG on Skyjacker 3" Suspension Lift; Automatic
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post #2 of 10 Old 03-28-2013, 03:05 PM
hp_lovecraft
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1981 CJ5 
 
Join Date: Sep 2009
Location: Maine
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Those are classic symptoms of a clogged cat. Its easy to check. Just disconnect at the manifold, and then run down the road and see if the problem disappears.

However, as far as having to "pump 20 times", that sounds like a sticky choke? I had that problem when mine was so gummed up that it didn't want to close, making it tricky to start cold. Then sometimes it could stick closed, making it run crappy when warm. However, that was a Carter YF, you must have a Carter BBD? Not sure if that applies.
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post #3 of 10 Old 03-28-2013, 03:33 PM
Trapshooter
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1986 CJ7 
 
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Location: Jacksonville, Oregon
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Having to pump 20 times to get fuel to the engine sounds like a fuel filter that is not installed correcting and is draining back to tank.

'86 CJ7, 258, Carter BBD, Nutter'ed, TeamRush'ed, T-18, Twin Sticked Dana 300, D30 Frt-Pwr Lok L/S-4.10, AMC 20 Rear-Mosers-Detroit Locker-4.10, 2.5 BDS Lift, 1" Body Lift, 33" Wild Country M/Ts, Black Spoke wheels

'45 CJ2A, L134 Go Devil, T-90 Tranny, Warn O/D, T-18 T-Case, Dana 25 Frt, Dana 41 Rear, 531st CJ made

My 401 build: http://www.jeepforum.com/forum/f8/tr...build-1338277/
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post #4 of 10 Old 03-30-2013, 05:12 PM Thread Starter
noy2014
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1986 CJ7 
 
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Location: Fort Lauderdale
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I'm running a Weber, WK551 - 32/36 DGEV, I'm wondering since the Jeep sat so long, almost 2 years, should I rebuilt it or am I past that?

I'm going to try and disconnect the cat tomorrow, that should be fun to see what those rusted bolts have in store for me. :/

So how the does the fuel filter installation look? I made sure to have the vapor return in the 12 o'clock position.
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"The new born" 2009 Sahara Unlimited - MyGig / Navigation, 35"x12.5" R20 on Teraflex 3" Spring Lift
"Grampa" 1986 CJ7 - 258 6cyl; Weber Carb 32/36 DGEV; Painless Harness replacement, 33" BFG on Skyjacker 3" Suspension Lift; Automatic
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post #5 of 10 Old 03-30-2013, 05:58 PM
hp_lovecraft
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Quote:
Originally Posted by noy2014 View Post
I'm running a Weber, WK551 - 32/36 DGEV, I'm wondering since the Jeep sat so long, almost 2 years, should I rebuilt it or am I past that?
When in doubt, I'll rebuild my carb, but I like doing it... I've even done it in a parking lot. Maybe there is a bad seal causing the bowl to drain? or the choke is not working properly? Maybe some dried gas gunk is plugging up a jet? Even if your fuel line drains, you should have enough fuel in the bowl to run for 10-20 seconds.

Quote:
I'm going to try and disconnect the cat tomorrow, that should be fun to see what those rusted bolts have in store for me. :/
.
Spray the heck out of those flange bolts! and spray some more.

With cats, sometimes what happens is rust, and junk clog up the honeycomb.... causing backpressure. Not enough to matter at low speeds, but as you get faster, it starts to effect the engine, and eventually it dies.

Could be other things, but this is an easy thing to elliminate.
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post #6 of 10 Old 03-30-2013, 06:49 PM
Trapshooter
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Quote:
Originally Posted by noy2014 View Post
I'm running a Weber, WK551 - 32/36 DGEV, I'm wondering since the Jeep sat so long, almost 2 years, should I rebuilt it or am I past that?

I'm going to try and disconnect the cat tomorrow, that should be fun to see what those rusted bolts have in store for me. :/

So how the does the fuel filter installation look? I made sure to have the vapor return in the 12 o'clock position.
What is the correct position. So that can be eliminated. The fuel filter looks quite new.

Curious to hear about having the cat disconnected.

Good LUCK!

'86 CJ7, 258, Carter BBD, Nutter'ed, TeamRush'ed, T-18, Twin Sticked Dana 300, D30 Frt-Pwr Lok L/S-4.10, AMC 20 Rear-Mosers-Detroit Locker-4.10, 2.5 BDS Lift, 1" Body Lift, 33" Wild Country M/Ts, Black Spoke wheels

'45 CJ2A, L134 Go Devil, T-90 Tranny, Warn O/D, T-18 T-Case, Dana 25 Frt, Dana 41 Rear, 531st CJ made

My 401 build: http://www.jeepforum.com/forum/f8/tr...build-1338277/
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post #7 of 10 Old 03-30-2013, 07:59 PM
Caish
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I would add a clear fuel filter before the pump by the motor mount.
This lets me see if fuel is flowing and making it to the pump.
Another thing to check is that your pump is not sucking air from a broke fuel line.
The clear filter will reveal that too.

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post #8 of 10 Old 03-31-2013, 11:16 AM Thread Starter
noy2014
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1986 CJ7 
 
Join Date: Feb 2009
Location: Fort Lauderdale
Posts: 313
Delete,

"The new born" 2009 Sahara Unlimited - MyGig / Navigation, 35"x12.5" R20 on Teraflex 3" Spring Lift
"Grampa" 1986 CJ7 - 258 6cyl; Weber Carb 32/36 DGEV; Painless Harness replacement, 33" BFG on Skyjacker 3" Suspension Lift; Automatic
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post #9 of 10 Old 03-31-2013, 04:38 PM Thread Starter
noy2014
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1986 CJ7 
 
Join Date: Feb 2009
Location: Fort Lauderdale
Posts: 313
So I disconnected the exhaust pipe from the manifold. Besides naturally being much louder, the Jeep ran better, nonetheless the sputtering started up again, this time at about 45 mph.

We regards to rebuilding the carb, how complicated is it?
Should I best leave that to someone with experience?
Are there any tutorials on how to rebuild carbs, specifically Weber 32/36 DGEV?

"The new born" 2009 Sahara Unlimited - MyGig / Navigation, 35"x12.5" R20 on Teraflex 3" Spring Lift
"Grampa" 1986 CJ7 - 258 6cyl; Weber Carb 32/36 DGEV; Painless Harness replacement, 33" BFG on Skyjacker 3" Suspension Lift; Automatic
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post #10 of 10 Old 03-31-2013, 06:19 PM
cj5huntingrig
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1974 CJ5 
 
Join Date: Jul 2012
Location: Stuart
Posts: 236
Its easy. Just search for threads and/or google.

1974 CJ5 all stock except for Rocky Road SOA
Completely for hunting - not for show or rock climbing
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