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post #1 of 8 Old 08-05-2002, 08:00 AM Thread Starter
mpbspb
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carter card

What is the biggest problem with the oringinal carter carb on the 258's

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post #2 of 8 Old 08-05-2002, 07:48 PM
Bob K
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Vacuum leaks. Particularly the throttle body where the throttle shaft runs through it. Bore out the idle tubes to circumvent lean running conditions.

'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

'99 Grand Cherokee 4.7 V8
Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
Alpine CD with Infinity+iPod connect
Just getting started!

If you're not living on the edge...
you're taking up too much space.
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post #3 of 8 Old 08-05-2002, 09:36 PM
johny1i
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The choke unloader causes a lot of people trouble. When you first crank your jeep, the diaphragm and its arm must keep the butterfly valve open 7mm (9/32"). Too far closed and the engine will suffocate, too far open and the choke is useless. It is very finicky.

Getting the accelerator pump adjusted correctly is another one. You have to really read your Chilton's manual and set those two screws inside the carburetor just right or you will have either a nasty flat spot just off idle, or your carb will "run out of steam" early.

My other complaints with it are not so much the carb 100%, but the function of its stepper motor and its "communication" with all of the sensors, etc. that feed the computer. This is a crude afterthought of an engine management system and if one of your sensors or the connections thereof start acting up, the carb is where the malfunction will appear, with it running too lean or rich. My jeep did okay after I de-emissioned and set the rods in the stepper motor to a permanent position, but by that time it had 130k miles and, like Bob K mentioned, other wear-and-tear factors start coming into play.

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #4 of 8 Old 08-06-2002, 06:57 PM
Bob K
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Good points Johny. Although I have no complaints about my stepper motor. Another great low buck BBD Carb mod. is to lose the vacuum operated choke and go with the AutoZone $4.95 universal choke cable adapter kit. Works like a charm, improved gas mileage too.

'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

'99 Grand Cherokee 4.7 V8
Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
Alpine CD with Infinity+iPod connect
Just getting started!

If you're not living on the edge...
you're taking up too much space.
Bob K is offline  
post #5 of 8 Old 08-07-2002, 08:04 AM
Plink
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My dad and I both have 258s in our YJs. Both sets of idle tubs have been drilled out to .046 with a Dremel. It is the best mod ever for the Carter Carb.

87 YJ 4.2
2" BL, 2" Shackle, 1.5" Black Diamond and Junk
31 MTRs on MOABs
Need new front and rear bumpers
HAM: KB3JQS
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post #6 of 8 Old 08-07-2002, 05:34 PM
Bob K
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This a low-buck accessory that will really keep your YJ purring:

http://www.driveajeep.com/tfi/index.html


'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

'99 Grand Cherokee 4.7 V8
Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
Alpine CD with Infinity+iPod connect
Just getting started!

If you're not living on the edge...
you're taking up too much space.
Bob K is offline  
post #7 of 8 Old 08-07-2002, 07:03 PM
johny1i
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The juicebox seems a lot like the Ford HEI upgrade, based on the premise that a spacing between the rotor and contacts will eliminate crossfire. I haven't done either because I never reach anywhere near 3000 rpm, but I might try it when my ignition module wears out. I hate to walk on this thread, but are replacement parts easy to get?

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #8 of 8 Old 08-07-2002, 07:32 PM
Bob K
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Location: New Bedford, MA
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The high energy coil puts out a much stronger spark allowing a wider spark plug gap and ability to run more advance. I really don't understand the whole theory about what it all does. But I really enjoy the results: better starting, more low end power, smoother idle, improved drivability during warmup in cold weather and overall smoother running. These must be some of the reasons that virtually all vehicles currently made run a higher voltage ignition system than what was standard twenty years ago. All for $135. I like it.

'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
K&N Filter
Custom Rock Guards
Turbo Muffler
Rear Track Bar in the shed
Other Tricks I won't tell to just anybody!

'99 Grand Cherokee 4.7 V8
Towing Package
K&N FIPK
ProComp MX6 shocks
Borla Exhaust
Tow Hooks
Alpine CD with Infinity+iPod connect
Just getting started!

If you're not living on the edge...
you're taking up too much space.
Bob K is offline  
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