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Old 08-22-2007, 08:33 PM   #1
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Angry Cherry hot exhaust

Hello all,
I am a newbie. I purchased a 1990 Wrangler Sahara 4.2. The jeep sat for a bit 2 years maybe. The original carter carb had the choke stuck open so was a bear to start in feb in NY. I had to pour a bit of gas directly minto the carb to get it running. It would run ok idle ok die once in a while. So since I did not know any better I bought a rebuilt carter and installed that. Meanwhile the muffler ruptured. so it sat in my garage until I had cash to get that repaired and register it. So fast forward to Aug wife took jeep to local garage to get road legal as a surprise for me. New muffler installed Jeep runs like crap up hills no power at all. Starts fine and runs fine just no power under load. So upon finding this website I purchase a MC2100. Installed that and now it runs the same. I looked at the spark plugs and they are black like soot is on them and my exhaust has fine black soot when I vroom vroom it. and the muffler was cherry hot. Any reason? I still need to finalize the mc2100 install with removing all the vac lines not being used. Possible the muffler is restricting the flow? It was the cheapest one, after all I have wife and kids, house, dog and cat and then a Jeep.
Thanks folks
Bern

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Old 08-22-2007, 09:14 PM   #2
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From everything you have posted I would guess that the Cat is plugged. Replace the converter (surprised they did not do that when in for muffler work)
That is my best guess. HTH
Jim

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Old 08-22-2007, 10:36 PM   #3
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Ditto with Hackle. I had a Ford carb run rich and plugged the cat. Got to the point of 15 mph in 4th! Towed to a dealership. They didn't have a replacement so the stuck the OEM cat in a bench vice and took the biggest screwdriver I had ever seen and proceeded to gut the cat. Put it back together and sent my home to my local dealership.

Check the CAT.
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Old 08-22-2007, 11:38 PM   #4
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also my guess

would be the cat as well they arent that espensive anymore you can get one at autozone or advanced auto parts for a little under $100
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Old 08-22-2007, 11:42 PM   #5
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Quote:
Originally Posted by Beast27 View Post
would be the cat as well they arent that espensive anymore you can get one at autozone or advanced auto parts for a little under $100
Just did my YJ with new cat and flowmaster. Had a shop I've used before do it (all welded in) and it was quite reasonable.
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Old 08-22-2007, 11:44 PM   #6
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If you are doing the MC2100 Swap make sure you check the jets that came in it. They frequently stick in jets that are 47 or 49. Mine had 44's and ran rich all the time. Switched them out to 42's and finally went down to 40's. I am at 6600 feet elevation which is higher than anything in NY. Just a suggestion!
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Old 08-23-2007, 06:49 AM   #7
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Thanks folks,
Yea the cat was pretty close to being removed but it was an additional $250 to the already $479 in the shop plus the $315 for registration THANK YOU NY!!! I am in over a grand and still not driving. Anyway, can I replace a cat myself or would it require welding? Grandpa jeeper, I think the carb was 42. The engine runs good at idle and I can give it gas in the driveway just not up the hill.
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Old 08-23-2007, 07:43 AM   #8
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I would not recommend trying to replace yourself the old one has to be cut out and the new one welded in. That price seems very high. I got a quote yesterday in my area for $120 installed. I would defiantly shop around if you have options. good luck
-Aaron-
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Old 08-23-2007, 11:46 AM   #9
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I picked up a high flow cat at summit for $60 and installed it all myself without welding. It will clamp on just fine like any other piece of the exhaust. I have about $400 in my entire exhaust...all brand new...header cat and flowmaster.
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Old 08-23-2007, 01:15 PM   #10
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if you're broke, for a tmeporary fix just cut behind the cat, get a screwdriver and BFH and gut that thing, then weld the exhaust back up (or maybe clamp if you cant weld)
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Old 08-24-2007, 08:25 PM   #11
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Smile

SUCCESS!!!!
I finished the install and removed the Thermac system and sealed any unused vac lines. The jeep started and ran blowing gas out the tail pipe once all that cleared it operates normally and has all the power up hills and down the highway. Fantastic! Thanks for the response folks.
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Old 08-24-2007, 08:41 PM   #12
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Old 08-24-2007, 09:07 PM   #13
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We do what we can ^_^

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Old 08-25-2007, 09:14 AM   #14
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im stupid, whats a Thermac system?

grandpa jeeper, where did you get your jets?
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Old 08-27-2007, 11:05 AM   #15
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cool... glad you got it taken care of.
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Old 08-28-2007, 08:04 PM   #16
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Ekalb1988,
I thought it was the vacuum system that used the heat of the engine to recirculate stuff basically I removed the whole mess of vacuum lines and only have the PCV, and the vacuum advance hooked up plus the vac line to the charcoal filter. the jets in mine were 47.5 seems to run fine but I am at 2000 feet to sea level lots of hills here in NY but no real mountains like out west.

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