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Unread 02-25-2013, 09:00 PM   #1
jeep1000
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1985 CJ7 
 
Join Date: Aug 2011
Location: Austin, Texas
Posts: 337
Engine Sputtering?

I have a 4 speed 258 I6 CJ7. When ever I start it up, it warms up fine and 1st gear is fine. But 2nd gear sputters towards the higher RPM range and so does 3rd and 4th. It doesn't create any jerks in the jeep or and vibrations, it just sputters. I let off the gas and then reapply it over and over again until it stops. Any ideas? I just recently replaced most of my vacuum lines and all

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'86 CJ7, I6 258 four speed manual. See ya on the trails!
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Unread 02-25-2013, 10:19 PM   #2
BagusJeep
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1981 CJ7 
 
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You could just be running out of fuel.

A common fault is split or cracked fuel hose at the tank on the supply line. The pump sucks in air through the cracks as well as fuel and you end up with a lot of air coming into the float chamber.

Do you have a clear fuel filter or short length of clear hose that you can out in just before the 3 way filter? If you are seeing large bubbles it is time to drop the tank and have a look.

Another problem could be float levels in the carb, a low float level would cause problems at higher speed.
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Unread 02-26-2013, 08:34 AM   #3
jeep1000
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It happensmore so when it is cold. Ill check that when I get home though. Any other ideas?
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Unread 02-28-2013, 07:58 AM   #4
jeep1000
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BUMP. Any other ideas? It happens more so when it's cold and it doesn't only happen at high speeds, also around 15-35. It's odd.
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Unread 02-28-2013, 08:49 AM   #5
Matt1981CJ7
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1. Faulty fuel pump

2. Cracked, or leaking fuel line, or hose.

3. Incorrect float level, or faulty float.

4. Carb in general need of re-build

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