Carter BBD initialization not happening -
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Unread 01-25-2015, 12:24 PM   #1
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1989 YJ Wrangler 
Join Date: Feb 2011
Location: St. Catharines, Ontario
Posts: 53
Carter BBD initialization not happening

The fsm says that turning the ignition on (not the engine) should cause the metering rods to initialize by moving in both directions and settling in the middle. Mine are not doing this. They move in when I crank the engine, though. Does anyone have any experience with this?

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Unread 01-25-2015, 12:54 PM   #2
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Posts: 5,297
Can you Nutter this jeep? Or do you have inspections to keep from doing it...

You can take out the little motor and clean all the crud out.. I hate the carter carb

If you get sick of messing with it and can swap carbs look into a Motorcraft 2150 or 2100
Or a weber..... I would not get the MC from ebay guy.... buy a used one and rebuild it... way too simple..
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Unread 01-25-2015, 02:24 PM   #3
Mike Romain
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1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 14,401
Moving in when you crank is proper at least. That is in the rich direction. When you turn the key on, do all the dash lights light up? I think there is a computer harness ground on the dipstick bolt but could be mistaken. Never hurts to clean grounds.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: (10 new albums added Sept 16/10)
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Unread 01-25-2015, 05:04 PM   #4
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1990 YJ Wrangler 
Join Date: Jun 2008
Location: st. louis
Posts: 1,404
Yeah, try to take out the motor and clean it.

It is held in by 4 bolts with torx heads. There is a spring in there that will try to escape, so be careful with that.

When you take it out, you'll see there is a notched plate that the 2 pins hook to. The plate is what moves the pins.

Mine didn't move at all, they were stuck. When I did the Nutter, I had to take it out and soak it in solvent (Seafoam if I remember right, it was a long time ago) for about 15 minutes and then work on it to get it loose. There was all kind of gummy crap in there.
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Unread 01-26-2015, 10:59 AM   #5
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1989 YJ Wrangler 
Join Date: Feb 2011
Location: St. Catharines, Ontario
Posts: 53
I bought a brand new, not rebuilt carb in August, so there is no crud anywhere. Everything ran fine for 2 months or so, then it started running like crap. Started troubleshooting as per the manual, checked all stuff indicated, continuity, voltages, etc. The pins never moved, so suspected the stepper motor was bad. All measurements of resistance, voltage, etc, are as per the manual, both at MCU and stepper motor. Wiring checks out fine from MCU to stepper motor.
Bought a used MCU from eBay and plugged it in with no change in symptoms.
Returned the carburetor to seller, and just got another carb on Saturday. Plugged it in temporarily (stepper motor), and initialization doesn't happen, but the pins move in/out when the engine is cranked over, so at least it's alive now. I will try to finish installing it today and give it a try.
I heard about a posting on another forum, where someone has the same symptoms regarding no initialization but pins move in/out when cranking over, so I suspect the computer program was changed at some point in time, but the manuals weren't, or there was a tech bulletin published later.
Engine starts very quickly with the choke on. My problem is that it won't idle at all once choke comes off.
Carburetor was replaced because of erratic idle, etc, lots of play on the butterfly bushings. When the new carb was installed it ran great for a couple of months.
I can't do the nutter because of emission testing in Ontario, otherwise I would happily do it.
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