problems with 258ci motor - JeepForum.com

 
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post #1 of 3 Old 10-09-2012, 06:09 PM Thread Starter
punisher02
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2002 TJ Wrangler 
 
Join Date: Oct 2012
Location: augusta
Posts: 1
Angry problems with 258ci motor

I have a 258ci motor that I am having a problem with. I have replaced carb plugs, wires,timing chain,distr. cap it has been coverted to electronic ignition. When I accelerate it coughs out through the carb. I don't know what else to do . Please HELP!

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post #2 of 3 Old 10-10-2012, 08:41 AM
goldknight
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2008 JK Wrangler 
 
Join Date: Aug 2012
Location: Dawsonville
Posts: 56
This would probably get better responses in tech. Year make and model of the Jeep? Backfiring through the carb is usually a sign of a timing issue. Have you checked to be sure the timing is set properly?
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post #3 of 3 Old 10-11-2012, 09:07 AM
RatchetJack
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1994 YJ Wrangler 
 
Join Date: Sep 2012
Location: Bremen
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I would check the timing with a timing light. If it shows to be in time and
still coughs I would move the distibutor one way or the other and see if it
improves. I'm not familar with jeep timing, covers, balancers ect.. but
sometimes those get swapped around with non original parts and will
read wrong.
If you have ruled out the timing, do a compression check on each cylinder.
A lobe worn off a cam will cause a continuous pop or cough as compression
is forced back through the carb or exhaust.
Removing the valve cover and observing the rocker arms as the engine
is turned over with the ignition disabled will rule out or discover a cam
or rocker arm issue.
A burned valve could also cause popping back into carb.
An intermittent loud cough or burp is a timing problem.
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