Figure this out and you are a Jeep GOD; hesitation in traffic but runs fine on hwy - Page 2 - JeepForum.com
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post #16 of 22 Old 08-05-2010, 02:31 AM
KMD
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1976 CJ7 
 
Join Date: Apr 2009
Location: Modesto
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I am with Biotex and the EGR theory. It was the first thing that came to my mind. Especially if it idles really low.

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post #17 of 22 Old 08-05-2010, 11:23 PM
Jantelagom
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1980 CJ5 
 
Join Date: Aug 2010
Location: Yale
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I'm pretty new at auto repair, but I've been having similar acceleration problems in town and lower speeds that go away at higher speeds.

My brain went to the fuel system first but I changed my spark plugs, air filter and PCV filter and the problem has vanished. Good luck! Let us know what works.

Last edited by Jantelagom; 08-06-2010 at 01:29 AM.
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post #18 of 22 Old 08-06-2010, 12:45 AM
carnuck
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1984 J-Series Truck 
 
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EGR or maybe choke sticking?

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post #19 of 22 Old 08-06-2010, 01:04 PM
Mike Romain
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1986 CJ7 
 
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You have some good ideas to check out, just unplugging the EGR and blocking it's line is a fast test for that and i have seen the manifold gasket act like that.

There is also a $2.00 air filter on the gas tank vent that can cause symptoms like you mention when it gets plugged up. It puts a vacuum on the gas tank which starves the carb for fuel. Likely in need of a change anyway.

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post #20 of 22 Old 08-06-2010, 03:17 PM
nshefbuch
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1982 CJ7 
 
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Quote:
Originally Posted by Mike Romain View Post
You have some good ideas to check out, just unplugging the EGR and blocking it's line is a fast test for that and i have seen the manifold gasket act like that.

There is also a $2.00 air filter on the gas tank vent that can cause symptoms like you mention when it gets plugged up. It puts a vacuum on the gas tank which starves the carb for fuel. Likely in need of a change anyway.
i had a pin hole in the gas hard line once that only acted up when i stepped on the gas while driving. it would cruise all day below 40 but once i stepped speed up then it would putt around.
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post #21 of 22 Old 08-07-2010, 03:52 PM
ReconRabbit
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1983 CJ7 
 
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My first thought was a choke sticking also.

If your Jeeps not leaking it's out of fluids.
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post #22 of 22 Old 03-03-2013, 01:51 PM Thread Starter
Ch3ater
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1984 CJ7 
 
Join Date: Aug 2010
Location: San Diego, CA
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I know this is long overdue, but I wanted to thank everyone for their advice and guidance. I hope this post has helped some others with their fuel related issues. I’d like to run through what actions I took to tackle the problem (over the last 2 years in between deployments).
• First, I followed the fuel line routing to ensure they were not being overheated by the exhausts system. Good to go.
• The EGR was not sticking and I went ahead and pulled the exhaust manifold and replaced the gasket.
• Fuel filter was GTG.
• The gas cap is not of the vented type, since the tank vents through charcoal canister.
• The choke may have been sticking, in hindsight.
In the end, I decided to ditch the Carter and upgrade to a Howell TBI setup. Glad I did, but that’s not the end of the story. After install, the jeep ran phenomenally… for a week. She ran exceedingly well on short trips, but any longer trip lasting for more than 15-20 minutes would cause a ridiculous amount of pressure to build in the gas tank and the jeep would run extremely rough. I dropped the gas tank and found a return line crimped between the tank and frame. The CJ had been rear ended before all this started and the collision repair guys dropped the tank to replace the skid plate.
What I can say is that I learned a lot in the process and, for my frustrations; I got a Howell TBI out of it – which is outstanding IMO. And the lesson learned is NEVER LET ANYONE ELSE WORK ON MY CJ BUT ME (with the sound technical advice of this forum, of course).
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acceleration stutter , hesitation , lag , nutter , overheat , vapor lock

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