4.2 258 makes 'fluttering' noise as I let off throttle?? - JeepForum.com
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Unread 09-29-2012, 02:43 AM   #1
MountainmanPaul
Registered User
1988 YJ Wrangler 
 
Join Date: Aug 2012
Location: Flagstaff, Arizona
Posts: 1
4.2 258 makes 'fluttering' noise as I let off throttle??

I have a 4.2 258 on an 88 YJ. It's stock with most emissions taken off. I've nuttered it and removed the EGR valve then capped it. It has a Weber 32/36 DGEV. I've played with the timing by ear (have no timing light yet) and adjusted the carburetor quite a few times. As I'm letting off the gas it makes a noise, almost like lifters but not really sure what is going on. I'm sure I don't have the timing right but did change the distributor vacuum to a ported line - it was on manifold vacuum. I'm thinking of changing to a Carter 4057 fuel pump thinking fuel pressure is problem for the Weber. Any ideas or help would be appreciated.

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fuel pressure , fuel pump , lifters , timing , weber carburator

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