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Loping on acceleration


 
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n_rorro
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Joined: 25 Apr 2008
Location: Hinesville, Georgia

PostPosted: Fri Apr 25, 2008 2:22 pm    Post subject: Loping on acceleration Reply with quote

I have a 1977 Jeep CJ7 with a V8 304. I have rebuilt the carb., replaced the timing chain and gears, replaced the fuel pump and all fuel lines, replaced the harmonic balancer all this week. When I finally got going it idled fine but when I went to test drive it down the road, at 30 mph it started to lope and hesitate. Can anyone tell me what I can do? I believe I set the timing right and put the gas to the carb at a pace that it dripped out of the side screw. I am at a loss for what to try next.
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hutchman
Captain Kirk
Captain Kirk


Joined: 07 Feb 2007
Location: Kennewick, WA

PostPosted: Fri Apr 25, 2008 2:32 pm    Post subject: Reply with quote

It sounds like it is going lean as you increase engine speed. If the float is set right, which it sounds like it is, and you have a new fuel pump that should be operating correctly, check the fuel filter. A plugged filter will result in symptoms similar to yours.

I have seen new fuel pumps that did not pump adequate fuel too. Surprisingly this was on a 304.

But hesitation and misfires as you increase speed are indicative of a lean condition normally.
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DaculaJeep
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Joined: 30 Jan 2009

PostPosted: Fri Jan 30, 2009 6:23 pm    Post subject: Mine did that as well... Reply with quote

when I went through the gears. In 3rd gear and above 2500 rpm, it would start loping.

I found out that the carb was set incorrectly. It wasn't getting enough fuel and basically ran itself dry.

Check the carb and make sure the it is setup correctly...Also check the fuel filters.
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