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Old 06-01-2006, 05:54 PM
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Question Experts!Help Me~!!!!

Hi, Everyone~~

I REALLY need experts help.

I have 89 Sahara with 4.2 L Eng.
It has only 98K miles on it.

Anyways, to get to the point, the problem.

It occurs when I slow down, it happens almost 80% of the time I slow down for the red lights.
My Jeep dies when I slows down, "UNLESS" I push little gas in.
My Rpm goes from 2500 and goes down to 0 unless I step on the gas lightly at about 1000. Then, it stays running @ about 1000.

Does anybody have any idea what's wrong with this?

I'm guessing it's old Fuel lines, pump, fiter which I haven't changed since I bought(4~5yrs. ago)
But, Some say it might be the carburetor.
Help Please~~ T.T
Soon or later, I could get killed.
If it is Fuel system problem (Fuel lines, pumps, fiter), does it cost a lot to fix? Do you guys recommand to buy parts and fix it my own? is it hard?

If it's carburetor, is it hard to replace it? or do you think I should rebuild it?

Thanks guys, and sorry for many questions. I'm dying to know the answer.

-Sean

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Old 06-01-2006, 08:29 PM   #2
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Had a similar problem. Try checking the EGR Valve. Replacing that could solve the problem. Its cheaper than a carb although I got a brand new Weber from Weber Direct for $349. So I did both as part of a total engine rebuild. Works great now.

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Old 06-02-2006, 08:23 AM   #3
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Might also be a vacum line, check your brake booster as well, as on my old Cj with the 4.2, it would die and we narrowed it down to vacum at the brake booster as I recall.
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Old 06-03-2006, 10:32 PM   #4
 
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i think i would have to say your problem lies in the pile of poop under your hood called the carter BBD carb they are junk replace it dont even try to rebuild it
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Old 06-08-2006, 10:37 PM   #5
 
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i just joined the site, because i finally bought me a jeep. it has been sitting for 2yrs. it is a 92 with a 2.5 4 banger that is mpi. and i am having the same problem. i can start the jeep if i have my foot on the gas and it runs smooth as long as i stay above 1000 rpm. i drop below that it runs rough and if you let off the gas it dies. i cleaned spark plugs and checked oil and new air filter. could it be the tps or fuel pressure anybody know or just bad gas?
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Old 06-09-2006, 11:06 AM   #6
 
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If you are trying to get it started with the original 2yr old gas in it, I would say that is a major problem. Siphon out the old, put in some fresh high test gas, and some Barrymans fuel conditioner, to get rid of the condensation that I am sure has built up in the tank. Flush out your whole fuel system with this and see if that helps. If you still have problems, let us know.
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Old 06-09-2006, 01:01 PM   #7
 
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yeah i have heard of that problem but then again i dont know if i would say that is the problem my parents garaged (my) 1970 chevelle malibu for 10 years, i towed it out of my grandmothers last year fiddled with the choke to get the float to work right and then she started right up after changing spark plugs and oil jsut for precaution. i was amazed so was the whole neighborhood at 230am when she came to live and i jsut had to open it right up ya know, burn all the built up carbon out
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Old 06-09-2006, 01:19 PM   #8
 
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Two reasons for what I said earlier. Different parts of the country have different blends, or additives, put into their fuel. In the triple digit heat that we have done here for 3 months or so, fuel tends to evaporate at a higher rate than in other parts of the country. Evaporation leads to loss of octane. I have seen an old International Scout that my son was messing around with, have almost a resin looking stuff in the carb, and fuel tank, that used to be fuel. I am sure that had been sitting in there for more than two years, it just doesn't take long down here to totally evaporate. As retnec58 is from Midland, TX, I figured he had that problem out there, as it is even hotter in that part of TX.
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Old 06-09-2006, 08:16 PM   #9
 
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thanks for the info. that is what i was going to do first. does anybody know what the voltage is supposed to be on the tps in case this does not work.
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Old 06-10-2006, 10:01 PM   #10
 
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ok. i did what you said. i drained the gas tank, put fuel conditioner in it, and filled it up with 91 octane. i ran it for about 20 minutes at about 2300 rpms. i let off the gas and it still died it still wont start without your foot on the gas. my maintence required light was on the whole time though. it ran good for being ran that much in 2 yrs.

it seems like when it comes time to ideal, the computer isnt telling it to give fuel for ideal. as soon as you left off the pedal the engine looses all fuel pressure.

so know what do i do. my next thing would be to check fuel pressure and tps. does any body know what the fuel pressure is supposed to be and what voltage the tps is supposed to be? keep in mind it is a mpi 4 banger. please help me!! lol
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Old 06-10-2006, 10:05 PM   #11
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I still say its a vacum issue, or a battery issue. and as far as the carter carb.. clean the pickup tubes and it will run great.
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Old 06-15-2006, 07:15 PM   #12
 
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we put half a can of carb cleaner in the throttle body and know it runs. the throttle body was so gummed up it wasnt getting enough air at idle. thanks for the help.
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Old 06-15-2006, 08:21 PM   #13
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Quote:
Originally Posted by 4Jeepn
I still say its a vacum issue, or a battery issue. and as far as the carter carb.. clean the pickup tubes and it will run great.

It sounds like it could be a vacuum issue for sure. The vacuum system on the YJ is far from bullet proof.

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