need some advise on mc 2150 -
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Go Back > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > need some advise on mc 2150

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Unread 12-04-2013, 10:28 PM   #1
Junior Member
1989 YJ Wrangler 
Join Date: Aug 2011
Location: Amity, Oregon
Posts: 73
need some advise on mc 2150

I bought a MC 2150 from the ebay guy (Gronk) and I am having a problem with it. I have tried to call (right to voice mail and no return call)and email (comes back Mail demon and can't send) him but no answer. I hope you guys can help me. I put it on as is and It idles excellent but stumbles at acceleration when cold. It also has gas draining out the little hole at the bottom of the accelerator pump cover. It is enough to drip and stain my intake. Is the diaphragm shot? Any help or ideas Thanks Dave

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Unread 12-04-2013, 11:06 PM   #2
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1989 YJ Wrangler 
Join Date: Sep 2013
Location: Reno, Nevada
Posts: 68
Bad accelerator pump diaphragm or the cover wasn't tightened down enough, and poor acceleration/stumbling sounds like it's running too rich and needs to be tuned.
Big Red Money Pit: 1989 Base YJ, 4.2l, MC 2150, nv3550, nv241or with 4:1 low, 2003 Rubicon f D44 & r ford 8.8 with 4.10 gearing, Skyjacker 4" double military wrap springs, RC perf. 2.2 shocks, homebrew 1/2" lift boom shackles, 31x10.5r15 Treadwright Guard Dogs.
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Unread 12-05-2013, 07:51 AM   #3
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Join Date: Dec 2004
Posts: 4,580
Yeap, another bad story of the EBAY guy. worthless support after the sale. The carb needs work, power valve and jets. ANd the obvious accelerator pump issue
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Unread 12-05-2013, 08:45 PM   #4
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1987 YJ Wrangler 
Join Date: Feb 2008
Location: Raleigh, NC
Posts: 375
These carbs are SUPER easy to tune and set up. A rebuild kit is like 15 bucks or so. Wouldn't hurt to pick one up as it contains all you need like the power valve/acc pump/etc.

A cold stumble can be low fuel level it's best to set it up at baseline & tune from there.

For a start (on 1.08 models):

tip of float should be 7/16" down from top edge of carb body. (fuel level)
main jest should be 47/48 at sea level -500 ft above (affects 1/4 throttle & above)
Acc pump rod should be in top hole of throttle arm and outmost hole in pump arm. (affects tip in acceleration)
Choke pull off (amount flap opens up from vacuum when motor starts) should be around 1/8" (affects cold start)
Power valve should be a 7.0 or so....the one in the rebuild kit works fine on my mostly stock motor.
Idle air screws should be 1 1/2 - 2 turns out from lightly seated

Assuming your ignition timing is correct, of course.

Take some pics if you can & we'll walk you thru the set up. It's really not difficult at all.
probably out breaking stuff.
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Unread 12-06-2013, 01:56 PM   #5
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1989 YJ Wrangler 
Join Date: Aug 2011
Location: Amity, Oregon
Posts: 73
Thanks for the tips. I will get on them.
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