Jeep yj stuttering problem - JeepForum.com
 
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post #1 of 4 Old 08-28-2014, 09:42 PM Thread Starter
Ctjeep200
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1991 YJ Wrangler 
 
Join Date: Mar 2014
Location: Molalla
Posts: 41
Jeep yj stuttering problem

I have a 1991 jeep 4.0 and it just recent started having this problem where when go up a hill or try to accelerate fast it keeps stuttering. So when I go up a hill it will stutters all they way up, it like the gas cuts off and then comes back. It doesn't do it really bad, but just enough to notice it and annoy me. I first thought it was because I had an empty tank but I filled it up and it still does it, so I'm not quite sure what it could be.

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post #2 of 4 Old 08-28-2014, 10:29 PM
mike134
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1989 YJ Wrangler 
 
Join Date: Aug 2014
Location: Cleveland
Posts: 6,070
how long have you had the jeep? If its new, are you sure you are in a low enough gear (depending on how steep the hill is).

First things to try:
Go to autozone, buy a new fuel filter and a new air filter for about 10-15 dollars (you should change these anyway, so you're not losing anything by trying it), also borrow their fuel pressure gauge so you can run some diagnostics, its free but you have to leave a deposit. Then search the forum or look in the manual on how to test fuel pressure (you really just plug it into the shrader valve on the fuel rail, pretty simple). You should be around 31 psi at idle, rev the engine and see if it changes.

You may also have a clogged catalytic converter, tap on it with a screwdriver to see if it rattles.

You also may need to run a tune up. New spark plugs (standard copper core, not platinum), wires, distributor cap, for about 30-100 dollars depending on quality, you don't really need the $100 racing wire set, but don't skimp too much. You should be changing these anyway so it can only help to do it now. You should also try cleaning your battery terminals with a wire brush.

It is almost always one of these three things. Usually the fuel pump or fuel pressure regulator on these cars though. so go borrow the fuel gauge.
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post #3 of 4 Old 08-28-2014, 10:48 PM Thread Starter
Ctjeep200
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2014
Location: Molalla
Posts: 41
Quote:
Originally Posted by mike134
how long have you had the jeep? If its new, are you sure you are in a low enough gear (depending on how steep the hill is). First things to try: Go to autozone, buy a new fuel filter and a new air filter for about 10-15 dollars (you should change these anyway, so you're not losing anything by trying it), also borrow their fuel pressure gauge so you can run some diagnostics, its free but you have to leave a deposit. Then search the forum or look in the manual on how to test fuel pressure (you really just plug it into the shrader valve on the fuel rail, pretty simple). You should be around 31 psi at idle, rev the engine and see if it changes. You may also have a clogged catalytic converter, tap on it with a screwdriver to see if it rattles. You also may need to run a tune up. New spark plugs (standard copper core, not platinum), wires, distributor cap, for about 30-100 dollars depending on quality, you don't really need the $100 racing wire set, but don't skimp too much. You should be changing these anyway so it can only help to do it now. You should also try cleaning your battery terminals with a wire brush. It is almost always one of these three things. Usually the fuel pump or fuel pressure regulator on these cars though. so go borrow the fuel gauge.
Alright I will try these. Thank you very much.
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post #4 of 4 Old 08-29-2014, 06:32 AM
Old4X
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1990 CJ7 
 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Pull the codes and post them here. Instructions are in the FAQs

418 miles on 19 gallons of gas. Can't beat the BBD !
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fuel , fuel filter , fuel pump , gas tank , YJ

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