random stalls.... - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 24 Old 04-25-2011, 01:26 PM Thread Starter
bigHeadMarine
Registered User
1989 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: Virginia Beach
Posts: 137
random stalls....

so ever since i've owned my CJ it seems to stall from time to time... its VERY random and only happens like once a week or so... but its something that i want to figure out... "nobody wants to get stranded"

it can be running fine going down the road or sitting still and then all of a sudden it seems to choke out, die and then takes a while to get started again... it tries to start after you pump the gas pedel repetadly.... like 20+ times then chokes out again.... i checked the fuel filter which seemed to be EMPTY, changed it out and it still does the same things..... now instantly i would think fuel pump was going bad but the fact that the jeep will start after 20 or so pumps on the pedal seems to tell me that the pump is still working. could it be air in the fuel line? not that i know where or how it could get there but still... who knows

any ideas?


"Pretend to be smart, use quotes"
bigHeadMarine is offline  
Sponsored Links
Advertisement
 
post #2 of 24 Old 04-25-2011, 03:07 PM
1911Tyler
Registered User
1977 CJ5 
 
Join Date: Oct 2010
Location: Charlotte
Posts: 441
mine would do a something like that. i would be driving and it would quit just like you turnd the key off then after a few minutes of trying it would start back up. a couple guys on here sad it could be Ignition control moduel. so i googled the effects of a bad ICM and it hit me thats got to be it. so i changed it and havent had a problem since. it sounds a lot like what you got going on. does spit and sputter or just die with no sign? if it just dies. do a google on bad ICM and see what you get and see if it matchs what your having for trouble.
1911Tyler is offline  
post #3 of 24 Old 04-25-2011, 03:59 PM
texasimport
Registered User
1978 CJ5 
 
Join Date: Aug 2009
Location: Loveland
Posts: 338
Two things to ponder.

1. Are you using the fuel return line back to your fuel tank? That return comes off the second, top/edge output on your fuel filter. The filter should be placed in such a way as to be the highest point in your fuel system, this way when you do get air in the lines it ends up in the return line and gets pushed back to the fuel tank.
2. Do you have your charcoal canister installed or? If not what are you doing with your fuel tank vent? If it is just plugged and could be ending up with a vacuum in your tank.

Next time it happens open your fuel tank and listen for the air rushing in, maybe?

Good luck

78 304-CJ5
texasimport is offline  
post #4 of 24 Old 04-25-2011, 06:40 PM
bkeese
Registered User
1949 CJ3A 
 
Join Date: Nov 2010
Location: Clarksville
Posts: 595
Mine did that and my wife towed it to the shop. A new module and $500 later it stalled 2 weeks later. It was fuel, just can't remember what. I think a new filter and a can of fuel additive did it. Sure was annoying.
bkeese is offline  
post #5 of 24 Old 04-25-2011, 07:17 PM Thread Starter
bigHeadMarine
Registered User
1989 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: Virginia Beach
Posts: 137
First off... im 99% sure the ignition module isn't an issue due tongue fact that none is installed!!! Secondly... I have only 1 in line and 1 out line on the fuel filter... no return line.... could this be a contributing factor on my super bad gas mileage??? :-(

"Pretend to be smart, use quotes"
bigHeadMarine is offline  
post #6 of 24 Old 04-25-2011, 07:34 PM
Trapshooter
Registered User
1986 CJ7 
 
Join Date: Mar 2007
Location: Jacksonville, Oregon
Posts: 2,309
Next time it happens, loosen the fuel cap and see if you get a "swoosh" of air. Or just run with the cap loose and see if the problem still occurs. You could have a venting problem with the fuel system or the system is sucking air.

Define "super bad gas mileage". An '85 CJ7 isn't exactly fuel efficient.

'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/
Trapshooter is offline  
post #7 of 24 Old 04-25-2011, 09:42 PM Thread Starter
bigHeadMarine
Registered User
1989 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: Virginia Beach
Posts: 137
Well.... since the rebuild... this last week has been the test week... but I am only getting about 110 miles to a tank of gas.... which unless my math sucks real bad... equates out to something like 7 mpg... which is super crappy!!!! I need to figure something else out... with the price of gas only getting higher I have to get a hold on this!

"Pretend to be smart, use quotes"
bigHeadMarine is offline  
post #8 of 24 Old 04-26-2011, 05:49 AM
trader
Registered User
1976 CJ5 
 
Join Date: Feb 2011
Location: ne
Posts: 62
i would think that at 7 mpg, you would get some black smoke at exhaust? pull the sparkplugs and see what they look like, looking for soot/flooding condition, and or, oil fouled/low compression. check timing, it will have big influence on mpg.

thanks for your service.

76 cj5, glass body, 360- dui, t150, locked 30 & 20 locked, one piece, 4:10
4 inch susp. lift 1 inch body, 33 swampers, disc front brake,
mile marker winch,on board air, agr steering, full roll cage.
trader is offline  
post #9 of 24 Old 04-26-2011, 07:54 AM
texasimport
Registered User
1978 CJ5 
 
Join Date: Aug 2009
Location: Loveland
Posts: 338
Quote:
Originally Posted by bigHeadMarine View Post
I have only 1 in line and 1 out line on the fuel filter... no return line.... could this be a contributing factor on my super bad gas mileage??? :-(
With out the return line you could be fighting a vapor lock issue with fuel from time to time.

78 304-CJ5
texasimport is offline  
post #10 of 24 Old 04-26-2011, 07:34 PM
tevans59
Registered User
1979 CJ7 
 
Join Date: Dec 2009
Location: aiken SC
Posts: 209
After replacing holley 600, fuel filter, and doing a team rush upgrade and new MSD street fire ing, I dropped the tank replaced sending unit and new rubber gas lines and I never had the issue again.
tevans59 is offline  
post #11 of 24 Old 04-27-2011, 06:48 AM Thread Starter
bigHeadMarine
Registered User
1989 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: Virginia Beach
Posts: 137
update... i had this issue today and for the first time since it started, i got out loosened the gas cap and put it back on... pumped the gas 5-10 times and it started right up!!!!! didn't sputter or anything! do you guys think that it just a vapor lock issue.. and my fuel pump is sucking air?

"Pretend to be smart, use quotes"
bigHeadMarine is offline  
post #12 of 24 Old 04-27-2011, 07:24 AM
trader
Registered User
1976 CJ5 
 
Join Date: Feb 2011
Location: ne
Posts: 62
Quote:
Originally Posted by bigHeadMarine View Post
update... i had this issue today and for the first time since it started, i got out loosened the gas cap and put it back on... pumped the gas 5-10 times and it started right up!!!!! didn't sputter or anything! do you guys think that it just a vapor lock issue.. and my fuel pump is sucking air?
sounds like that is the problem. with no vent, the pump can only suck so much, until the vacuum created in the tank overcomes the ability of the pump. i would rig up a return line. i think maybe your bad mpg may be caused partly by fuel being forced past the needle valve in the carb. making a flooding condition.

76 cj5, glass body, 360- dui, t150, locked 30 & 20 locked, one piece, 4:10
4 inch susp. lift 1 inch body, 33 swampers, disc front brake,
mile marker winch,on board air, agr steering, full roll cage.
trader is offline  
post #13 of 24 Old 04-27-2011, 09:52 AM
Full Tank
Registered User
1980 CJ5 
 
Join Date: Jun 2007
Location: SK, Canada
Posts: 593
Quote:
Originally Posted by tevans59 View Post
After replacing holley 600, fuel filter, and doing a team rush upgrade and new MSD street fire ing, I dropped the tank replaced sending unit and new rubber gas lines and I never had the issue again.
That's some good advice right there.

FT

1980 CJ5 39k
Dana 30--AMC20--D300--T176--258

1986 CJ7
Dana 30--AMC20--D300--T5--2.5L
Full Tank is offline  
post #14 of 24 Old 04-27-2011, 10:33 AM
FLynes
Web Wheeler
 
FLynes's Avatar
1976 CJ5 
 
Join Date: May 2010
Location: Nampa
Posts: 3,236
Garage
If your CJ is suffering from vapor lock, AND you don't have the time/resources to fix it right away, the quick poor man's fix is to put a couple of wooden clothes pins with the metal springs on the metal fuel lines in the engine compartment. I had a 1972 K5 Blazer and Suburban that vapor locked frequently...clothes pins fixed the issue, until I could redo the fuel system correctly.

BTW, how is your ignition setup without a module? Just curious, because if I could do away with mine, it'd be one less headache to worry about.

SFC Fred Lynes

Fred
Retired Army Guy

High Plains Drifter
1976 CJ-5
Lime Green
Black Wellington Vinyl Bench Seats
258 I-6 1bbl
T-150 3-Speed
3.54:1 Open Gears

Grammar Test
FLynes is offline  
post #15 of 24 Old 04-27-2011, 11:45 AM Thread Starter
bigHeadMarine
Registered User
1989 FSJ Wagoneer 
 
Join Date: Mar 2010
Location: Virginia Beach
Posts: 137
Quote:
Originally Posted by FLynes View Post
If your CJ is suffering from vapor lock, AND you don't have the time/resources to fix it right away, the quick poor man's fix is to put a couple of wooden clothes pins with the metal springs on the metal fuel lines in the engine compartment. I had a 1972 K5 Blazer and Suburban that vapor locked frequently...clothes pins fixed the issue, until I could redo the fuel system correctly.

BTW, how is your ignition setup without a module? Just curious, because if I could do away with mine, it'd be one less headache to worry about.

SFC Fred Lynes
Nutter bypass is the answer about the module.... as for the clothes pins i'm not sure how thats supposed to work.... seems like that would restrict the amount of fuel that can flow through there... just a thought???

"Pretend to be smart, use quotes"
bigHeadMarine is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
258 just up and stalls mmerlina Jeep CJ Forum 4 11-22-2009 06:21 AM
258 stalls at 20 mph 80HouLaredo Jeep CJ Forum 3 11-08-2009 01:02 PM
258 stalls when w/o AC on thundermunkey Jeep CJ Forum 3 01-06-2009 11:47 AM
AMC 360 CJ7 stalls JeffJ Jeep CJ Forum 6 06-24-2008 08:47 AM
304 stalls when hot. 79' cj-7 mudmud Jeep CJ Forum 2 03-11-2003 08:44 AM

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome