Holley 4bbl on 302 surging at idle! - JeepForum.com
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post #1 of 4 Old 04-27-2013, 01:04 PM Thread Starter
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1984 CJ7 
Join Date: May 2009
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Holley 4bbl on 302 surging at idle!

Hello all,

It's been a while since I've been on, but I could sure use some help with this problem I've been trying to track down for some time now. I'm not sure if surging is the right term, but I'll try to describe it:

When sitting at idle, it begins to almost stall out before surging back to normal idle speed. This happens without me giving it any throttle or anything. It will rarely ever actually stall, but the idle goes wayyy down and then returns to normal and it just keeps repeating this pattern.

So in essence my idle is like "rumble rumble...almost stalls...rumble rumble...almost stalls...rumble rumble"

I installed the carb not long ago and had the timing set by a shop. Plugs and wires are good, so I'm pretty sure it's either a fuel delivery problem or something with the carb. Any ideas?

Thanks. CCB

If it's not leakin', it's probably empty '84/'77 CJ7 Ford 302 4bbl Holley
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post #2 of 4 Old 04-27-2013, 08:36 PM
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Start with checking your float level. Here's a decent how-to. http://www.junkyardgenius.com/holley/tune01.html

1978 CJ7: 304, 3Spd, AMC 20 Rear, Thrush Welded Mufflers W/ Turndowns, Unknown Front, Worn out Dana 20 case
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post #3 of 4 Old 04-28-2013, 09:24 AM
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1971 CJ5 
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Adjust the idle mixture screws.If this doesn't to it, then:
Check the power valve to see if it is leaking.
Blow out/clean all passages in the metering block and body on the primary side.
Check the float level. Be sure to check the secondaries as well.
Adjust the idle mixture screws.
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post #4 of 4 Old 04-28-2013, 09:49 AM
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You don't, by chance, have a cheapo fuel pressure regulator installed, do you? That sounds awfully familiar.


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