International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-11-2009, 06:54 PM
Dirtball's Avatar
Dirtball Dirtball is offline
Bleedin' Gasoline
 
Join Date: Apr 10, 2006
Location: Oneonta, AL
Posts: 2,079
Bad stumble on acceleration coming home last week- fixed!!

On my way home from getting all the parts outlined elsewhere my truck started running worse and worse, especially going uphill. It would idle, but when it got under load it would start stumbling and, I thought, missing. I took a longer route home with fewer hills to give myself some peace of mind. When I got home and pulled into the drive it was idling fine. When I would gas it it would stumble. I popped the hood and you could hear a distinct whistling sound that was not there before.

Is there anyone who DOESN'T think it's a vacuum leak?

I couldn't find it... but as tired and tense as I was I just wanted to get everything unloaded and get into the house to eat pizza and watch the Braves.

I'll tackle it Monday...
__________________
Paul
1979 Cherokee N/T
360/TH400/Qtrac/D44s/rear Lock-right
6 inch Hell Creek all spring lift
34x10.50 Super Swamper LTBs
http://i54.photobucket.com/albums/g1...t/100_1394.jpg
http://i54.photobucket.com/albums/g1...t/100_1390.jpg
http://i54.photobucket.com/albums/g1...100_1387-2.jpg

Last edited by Dirtball : 04-18-2009 at 08:09 PM.
Reply With Quote
  #2  
Old 04-11-2009, 07:04 PM
sappy76's Avatar
sappy76 sappy76 is offline
Grease Monkey
 
Join Date: Dec 26, 2007
Location: Kalamazoo, MI
Posts: 512
Any mods to the ignition? I fought the "stumbles" for years. It wasn't until I went to a larger cap on the rotor (juice box) upgrade that I finally got rid of it. Check the inside of your cab for carbon tracks leading to the various pickup points for the spark plugs. Was it raining or the engine wet causing a spark short somewhere? Also check your vacuum, you might have a leak in a hose.
Reply With Quote
  #3  
Old 04-12-2009, 07:25 AM
Dirtball's Avatar
Dirtball Dirtball is offline
Bleedin' Gasoline
 
Join Date: Apr 10, 2006
Location: Oneonta, AL
Posts: 2,079
Yeah, I kind of figured/hoped that the whistling sound I heard was a vac leak. I'll get it into the garage tomorrow and get it checked out...
__________________
Paul
1979 Cherokee N/T
360/TH400/Qtrac/D44s/rear Lock-right
6 inch Hell Creek all spring lift
34x10.50 Super Swamper LTBs
http://i54.photobucket.com/albums/g1...t/100_1394.jpg
http://i54.photobucket.com/albums/g1...t/100_1390.jpg
http://i54.photobucket.com/albums/g1...100_1387-2.jpg
Reply With Quote
  #4  
Old 04-12-2009, 07:48 AM
JeepsAndGuns's Avatar
JeepsAndGuns JeepsAndGuns is offline
AMC 4 OH! 1
 
Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,573
How did you check for vaccume leaks? A old trick I have heard, is to take a can of starting fluid or carb cleaner and start spraying the carb, gaskets, and anywhere else that vaccume may leak. If its leaking, it will suck the carb cleaner in and you will hear the idle change.
__________________
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
Reply With Quote
  #5  
Old 04-12-2009, 08:51 AM
littlebuck23's Avatar
littlebuck23 littlebuck23 is offline
258 I6
 
Join Date: Aug 07, 2008
Location: San Jose, CA
Posts: 496
Whisle as u know is a dead giveaway to a vac leak. However. You engine might be suffering from fuel starvation. Just for fun replace the filter. I like to blow in the newone and in the removed one to see how clogged up they are.
__________________
Terry

1970 Kaiser Wagoneer -SOLD (currently getting built by new owner)
Build thread-http://www.ifsja.org/forums/vb/showthread.php?t=103447
1979 Cherokee Chief WT 360. SOLD
1977 Cherokee Chief WT Sport 401. SOLD
1975 International Scout II (My DD)
Reply With Quote
  #6  
Old 04-13-2009, 06:49 PM
Dirtball's Avatar
Dirtball Dirtball is offline
Bleedin' Gasoline
 
Join Date: Apr 10, 2006
Location: Oneonta, AL
Posts: 2,079
Quote:
Originally Posted by JeepsAndGuns
How did you check for vaccume leaks? A old trick I have heard, is to take a can of starting fluid or carb cleaner and start spraying the carb, gaskets, and anywhere else that vaccume may leak. If its leaking, it will suck the carb cleaner in and you will hear the idle change.

I got some starting fluid today... but by the time we got home from Wally World and ate my Monday Night Comedies were on... it's my one big TV night.
__________________
Paul
1979 Cherokee N/T
360/TH400/Qtrac/D44s/rear Lock-right
6 inch Hell Creek all spring lift
34x10.50 Super Swamper LTBs
http://i54.photobucket.com/albums/g1...t/100_1394.jpg
http://i54.photobucket.com/albums/g1...t/100_1390.jpg
http://i54.photobucket.com/albums/g1...100_1387-2.jpg
Reply With Quote
  #7  
Old 04-14-2009, 09:31 AM
scantar's Avatar
scantar scantar is offline
FSJ Maniac
 
Join Date: Jul 16, 2005
Location: OK Denver, dangit! :)
Posts: 4,296
I would be very careful about spraying starter fluid around the engine (as in I wouldn't do it!). It's highly combustible whereas carb cleaner is not. If you really really want to use starter fluid, have a fire extinguisher strapped to your helmet.

Steve
__________________
'76 Waggy, TH400, Quadratrac and a fourOH!one Sold

My other car is a Viner Pro Team...no wait, my other car is a Masi Speciale...nonono, my other car is a Bianchi 928SL
Reply With Quote
  #8  
Old 04-14-2009, 06:10 PM
JeepsAndGuns's Avatar
JeepsAndGuns JeepsAndGuns is offline
AMC 4 OH! 1
 
Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,573
Yea, carb cleaner is better, but starting fluid will work. Just do it with the engine cool, and only doo it in short bursts. Dont hose it down too much. Keep it away from the exhaust!! But you knew that already.
__________________
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
Reply With Quote
  #9  
Old 04-18-2009, 06:24 PM
Dirtball's Avatar
Dirtball Dirtball is offline
Bleedin' Gasoline
 
Join Date: Apr 10, 2006
Location: Oneonta, AL
Posts: 2,079
I did the starter fluid thing and, since there are no vacuum hoses running anywhere near my exhaust manifolds, everything went fine. Also, no vacuum leaks.

However... today, I replaced the fuel filter. Simplest fix first as I usually suggest on here. And guess what? That was the fix. Isn't it amazing? I didn't really think it was electrical since it wasn't backfiring or spitting/sputtering. I have no clue what the whistling sound was. It's not doing it now (and it wasn't doing it this morning when I drove it and it still had the stumble).

Anyway, once again, I get lucky and have a quick fix.

Now if that new Qtrac and Lockright would both just jump in there as easily.
__________________
Paul
1979 Cherokee N/T
360/TH400/Qtrac/D44s/rear Lock-right
6 inch Hell Creek all spring lift
34x10.50 Super Swamper LTBs
http://i54.photobucket.com/albums/g1...t/100_1394.jpg
http://i54.photobucket.com/albums/g1...t/100_1390.jpg
http://i54.photobucket.com/albums/g1...100_1387-2.jpg
Reply With Quote
  #10  
Old 04-19-2009, 08:01 PM
JeepsAndGuns's Avatar
JeepsAndGuns JeepsAndGuns is offline
AMC 4 OH! 1
 
Join Date: Jul 18, 2003
Location: Cullman, AL
Posts: 4,573
I like those clear plastic fuel filters. That way you can see whats in there, and when it needs changed.
__________________
79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
Reply With Quote
  #11  
Old 04-19-2009, 08:17 PM
silvercert silvercert is offline
Gear Head
 
Join Date: Feb 05, 2009
Location: Goldsboro NC
Posts: 707
Quote:
Originally Posted by Dirtball
I did the starter fluid thing and, since there are no vacuum hoses running anywhere near my exhaust manifolds, everything went fine. Also, no vacuum leaks.

However... today, I replaced the fuel filter. Simplest fix first as I usually suggest on here. And guess what? That was the fix. Isn't it amazing? I didn't really think it was electrical since it wasn't backfiring or spitting/sputtering. I have no clue what the whistling sound was. It's not doing it now (and it wasn't doing it this morning when I drove it and it still had the stumble).

Anyway, once again, I get lucky and have a quick fix.

Now if that new Qtrac and Lockright would both just jump in there as easily.

I had a whistle and it turned out to be my carb gaskets.
Reply With Quote
  #12  
Old 04-19-2009, 08:40 PM
Chris P.'s Avatar
Chris P. Chris P. is offline
Master Mechanic
 
Join Date: Oct 12, 2003
Location: Mt. Solon, Virginia
Posts: 1,307
Yep, carb gaskets can whistle.

Once I had a whistle I couldn't track down. It didn't happen all of the time. One day I took the carb off for something unrelated and found the plastic spacer was cracked. I swapped it out and never had anymore whistle.
__________________
79 J10 Honcho 360/T-18/D20
Summit 8600 cam, GM TBI
78 Wagoneer 360/TH400/QT

Reply With Quote
  #13  
Old 04-20-2009, 09:48 AM
newtojeeps's Avatar
newtojeeps newtojeeps is offline
350 Buick
 
Join Date: Jun 28, 2006
Location: California
Posts: 1,413
Quote:
I like those clear plastic fuel filters. That way you can see whats in there, and when it needs changed.
They pulled those off the shelf here in CA. They are all the white plastic now.
I think the Alcohol in the fuel may have been an issue but not sure.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:28 PM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
corner corner