Sputter, gas smell and limited speed - JeepForum.com
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post #1 of 55 Old 06-17-2011, 03:49 AM Thread Starter
mgkbull
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1987 YJ Wrangler 
 
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Location: Albuquerque
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Sputter, gas smell and limited speed

Hi again all. Got another issue that seems to be quite common amongst YJ owners. I did a forum search trying to find a solution but none of the results "I" found are exact.

I purchased my 87 YJ just a few days ago and I've noticed the following:

I smell gas almost every time I drive it.
It seems to not want to go over 2k RPM. It seems to clog somehow, almost like there's a speed limiter on it.
After going highway speeds and downshifting to slow down, I hear sputtering underneath and to the right of me, like it's coming from the passenger side. It's almost like it's an internal backfire, without the loud bang.

So with the smell, limited speed and sputtering, I'm thinking it's the cat that's clogged or something.
And oh yeah! I came home from work this morning and when I shut the engine off it "Dieseled" (burned off excess gas) erratically for a few seconds and then quieted down. So now I'm thinking TPS.
Any thoughts anyone? Thanks in advance!

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post #2 of 55 Old 06-17-2011, 08:02 AM Thread Starter
mgkbull
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bump
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post #3 of 55 Old 06-17-2011, 11:20 AM
Que89YJ
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Is it a fuel injected 4.0L or a carbed 4.2L?
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post #4 of 55 Old 06-17-2011, 12:57 PM
scrapman
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I believe your 87 has the infamous carter bbd carburetor on it. It is known for getting clogged idle tubes. It sounds like your running rich, which would cause the smell and diesling.

I would also look into something called "Nutter Bypass" Unless all of your smog equipment is in perfect shape, you will never get your engine running well. The bypass gives you control of the carburetor again and allows you to tune it, instead of a computer continually adjusting the fuel/air ratio.

You may want to check your local laws first and make sure it is ok for you to jack with your emissions stuff.
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post #5 of 55 Old 06-17-2011, 01:33 PM Thread Starter
mgkbull
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It's the carbed 4.0 L6. Or... is it 4.2? I thought it was 4.0...

Nutter Bypass? I'll have to research that.

I found this link and I'm going to try that tomorrow. I'll post here if it worked. Thanks guys.
http://www.offroaders.com/tech/jeep/engine-carter.htm
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post #6 of 55 Old 06-17-2011, 01:35 PM
monkeyhouse
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Quote:
Originally Posted by mgkbull View Post
It's the carbed 4.0 L6. Or... is it 4.2? I thought it was 4.0...

Nutter Bypass? I'll have to research that.

I found this link and I'm going to try that tomorrow. I'll post here if it worked. Thanks guys.
http://www.offroaders.com/tech/jeep/engine-carter.htm
You will need to make sure whether you have a 4.0 or a 4.2 first. Look on the side of the block. The 4.2 says 258. The 4.0 is a 242. The 4.0 comes from the factory with FI, but 4.2 comes with the Carter BBD.(as que mentioned)

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #7 of 55 Old 06-17-2011, 01:46 PM Thread Starter
mgkbull
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So, since I have a carburator it should be 4.2 yes? At work right now and can't run out and check
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post #8 of 55 Old 06-17-2011, 01:50 PM
monkeyhouse
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Quote:
Originally Posted by mgkbull View Post
So, since I have a carburator it should be 4.2 yes? At work right now and can't run out and check
SHOULD BE, lol. well, what I was trying to explain was that is how they came out, doesn't mean somebody hasn't modified it....and yes, I have actually seen posts from people who wanted to put a carb on a 4.0. Easiest thing to do is look for the carb and the 258 on the block.

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #9 of 55 Old 06-17-2011, 01:52 PM Thread Starter
mgkbull
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Ah OK, thanks for the explanation. I don't thing it's been modded in any way. I bought it from original owner and the only thing she did was paint it yellow. Never even put it in 4Low :/ Shame really. She maintained it nicely though.
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post #10 of 55 Old 06-17-2011, 02:06 PM
dancytron
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Look at this page

http://home.sprynet.com/~dale02/list.htm

Make sure the choke is opening all the way.

Its a somewhat of a longshot, but unplug the knock sensor and see if that fixes it. If so, replace it.

If not, search Team Rush and Nutter bypass.
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post #11 of 55 Old 06-17-2011, 02:08 PM
monkeyhouse
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Quote:
Originally Posted by mgkbull View Post
Ah OK, thanks for the explanation. I don't thing it's been modded in any way. I bought it from original owner and the only thing she did was paint it yellow. Never even put it in 4Low :/ Shame really. She maintained it nicely though.
Okay, sounds like you probably have a 4.2 with a carter BBD. Just FYI, here is a link with some good 4.0 pics:

http://www.jeepforum.com/forum/f12/p...-setup-857588/

and here is what my 4.2 looked like with a carter on it:




First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #12 of 55 Old 06-17-2011, 02:09 PM Thread Starter
mgkbull
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Thanks @dancytron!
I researched Nutter bypass and it's illegal for emissions almost everywhere now. This will be my daily driver so I def don't want to fail inspections next time around.
I'm clicking on "Electric choke" link?
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post #13 of 55 Old 06-17-2011, 02:10 PM
monkeyhouse
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I have some greats docs for carter's if you want them.

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #14 of 55 Old 06-17-2011, 02:10 PM Thread Starter
mgkbull
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Quote:
Originally Posted by monkeyhouse View Post
Okay, sounds like you probably have a 4.2 with a carter BBD. Just FYI, here is a link with some good 4.0 pics:

http://www.jeepforum.com/forum/f12/p...-setup-857588/

and here is what my 4.2 looked like with a carter on it:



Yeah looks just like mine
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post #15 of 55 Old 06-17-2011, 02:13 PM Thread Starter
mgkbull
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Something I just noticed, the choke plate is a bit different on mine.. it's more open...
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carburetor , carter carb , rebuild kit , sputtering

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