Why does my motor skip? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-22-2003, 02:03 AM
WretchedJeep
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Why does my motor skip?

When i start the jeep up in the morning it idles at just above 500 rpm. This is due to the fact that there is a very bad and noticeable skip in the engine. I cant tell if it is just one cylinder or several cylinders skipping. If i press down on the gas and rev it up, the rpms climb but i can still hear a skip. If i hold the rpm at 750 or so for about 10 minutes it settles out and idles just fine. Also, if I have driven it somewhere and even if it sets for several hours in very cold weather it doesnt skip when i start it up. This is if it has been warmed up and the skipping stopped after i warmed it up that morning. If anyone has any advice then i would appreciate any help. Thanx in advance.
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post #2 of (permalink) Old 02-22-2003, 07:42 AM
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Re: Why does my motor skip?

1. Are you running the stock carb?
2. You've got a 4cyl engine, correct?
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post #3 of (permalink) Old 02-22-2003, 10:04 AM
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Re: Why does my motor skip?

Try leaning out the choke setting a bit . Loosen the three outside lock rings screws and rotate the choke a bit , and see if the tension eases on the choke blades . There are left and right pull versions of Weber chokes, so it's hard to tell which direction to turn it . Also, if it's electric, make sure it's grounded and getting power any time the engine is running . Sometimes the grounding lug can get corroded and not let it warm the spring, keeping it rich and balky .
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post #4 of (permalink) Old 02-22-2003, 03:48 PM
WretchedJeep
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Re: Why does my motor skip?

Im running with a WEber 38 and the 258. Also, can you be a little more specific on how to lean out the mixture. I have noticed the engine does run very rich.
post #5 of (permalink) Old 02-22-2003, 04:31 PM
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Re: Why does my motor skip?

1. If you can hold a screw driver by the correct end you can tune a Weber!
2. Click on the picture below and read over the instructions.
3. See if it's something you'd like to try.
4. What do you have to loose?
5. If you do decide to do the job let the forum know how it turned out!

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post #6 of (permalink) Old 02-23-2003, 07:24 AM
**DONOTDELETE**
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Re: Why does my motor skip?

Wait, don't use those instructions! Those are for the 32/36 and the settings are twice as high as they need to be for a 38. Use this one instead.

Good luck - Michael
post #7 of (permalink) Old 02-23-2003, 08:51 AM
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Re: Why does my motor skip?

Get a vacuum/pressure guage and hook it inline between the fuel pump and carb , and check your fuel pressure at idle and also with it revved up . If it's over 3psi, get a pressure regulator and guage on it . You will never get it to run correctly with too much fuel pressure , the lean best idle settings can't be done since the float won't stop the pump from forcing fuel out of the idle jets .
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