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post #1 of (permalink) Old 09-06-2001, 05:25 PM
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metering pins in carb not working

the metering pins in my carb arent working they should be goin back and forth but they arent moving anyone have a clue what could be wrong i think that may be causeing my engine to not run right thanx

'87 jeep wrangler in process of building
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post #2 of (permalink) Old 09-06-2001, 05:33 PM
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Re: metering pins in carb not working


my friend, your stepper motor get-up is most likely "broken"
What a supprise.
Nutter Bypass time.

Jeep Icon, Raised 2", Lowered 2", 4pt Independant Suspention. (Yes, that is an Oompa Loompa driving it.)
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post #3 of (permalink) Old 09-06-2001, 11:24 PM
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Re: metering pins in carb not working

Mine were frozen in the body of the carb. I replaced the stepper motor and the PCM before I figured out what was going on. If I remember correctly, I think they are supposed to move back and forth once when you first start up the engine. After that they are supposed to move in relation to what the O2 sensor tells the PCM. I could be wrong... I can't remember how you test the stepper motor. I think that is where you need to start. Make sure the motor is OK... If so, maybe your pins are stuck like mine were. I got a whole new carb complete for pretty cheap at local parts store. I will look... I think I had a good link to a website on how to diag this system.

Honestly, I hate it. Mine still runs like crap. but the pins move like they are supposed to.

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post #4 of (permalink) Old 09-07-2001, 12:21 AM
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Re: metering pins in carb not working

Take a look at a great article called the "258 Primer". It will give you lots of good info on your Carter BBD carb. Take a look in the tech section at and you will find the article. This article will tell you how all the computer controled jund should work and how to test a lot of it. Your problem could be a bad 02 sensor, bad stepper motor, bad computer... The article will help you figure it out. The needles don't tend to move to much just sitting in the driveway anyhow.

'88 Sahara, 4.2 that runs. The rest is getting there![img]/wwwthreads_images/icons/blush.gif[/img]
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