Jeep stuttering problem - JeepForum.com
 
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post #1 of 10 Old 09-02-2014, 07:53 PM Thread Starter
Ctjeep200
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1991 YJ Wrangler 
 
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Jeep stuttering problem

About three days ago my 91 jeep wrangler started having this problem where when I accelerate it started to stutter and whenever I went up hills it would just stutter all the way up. It's like it's not getting enough fuel. And it had gotten worse everyday. So I changed the fuel filter today, and it helped it a lot but I can still notice it. It has a new air filter, new plugs and cap, and I just changed the fuel pump. What could I do to fix this problem?

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post #2 of 10 Old 09-02-2014, 08:43 PM
mike134
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The first diagnostics to try:

You should test your fuel pressure. Go to autzone and ask to borrow the fuel pressure gauge. It will be free. Plug it into the shrader valve on the fuel rail and come back to tell us the pressures. You could have a fuel pressure regulator that is going bad, this will help diagnose it.

You also may have a clogged catalytic converter. Tap on it with a screwdriver and see if it sounds like its rusted out.

Spray carb cleaner around the engine (away from the air intake) and see if the engine rpm goes up. This will help diagnose a vacuum leak.


Did you change your spark plug wires as well?
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post #3 of 10 Old 09-02-2014, 08:45 PM Thread Starter
Ctjeep200
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Quote:
Originally Posted by mike134
The first diagnostics to try: You should test your fuel pressure. Go to autzone and ask to borrow the fuel pressure gauge. It will be free. Plug it into the shrader valve on the fuel rail and come back to tell us the pressures. You could have a fuel pressure regulator that is going bad, this will help diagnose it. You also may have a clogged catalytic converter. Tap on it with a screwdriver and see if it sounds like its rusted out. Spray carb cleaner around the engine (away from the air intake) and see if the engine rpm goes up. This will help diagnose a vacuum leak. Did you change your spark plug wires as well?
Alright I will go get a pressure regulator tomorrow. Along with checking my cat.
Yes the wires were also changed
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post #4 of 10 Old 09-02-2014, 09:33 PM Thread Starter
Ctjeep200
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Quote:
Originally Posted by Ctjeep200
Alright I will go get a pressure regulator tomorrow. Along with checking my cat. Yes the wires were also changed
. I meant a fuel presser gauge
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post #5 of 10 Old 09-03-2014, 07:01 AM
Que89YJ
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Check your fault codes. Always start by checking codes
https://www.jeepforum.com/forum/f12/h...codes-1257145/
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post #6 of 10 Old 09-03-2014, 12:31 PM Thread Starter
Ctjeep200
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Quote:
Originally Posted by Que89YJ
Check your fault codes. Always start by checking codes https://www.jeepforum.com/forum/f12/h...codes-1257145/
I do not have a checkegine light to check my codes
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post #7 of 10 Old 09-03-2014, 01:21 PM
Que89YJ
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Do you have a burned out bulb?
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post #8 of 10 Old 09-04-2014, 08:23 PM Thread Starter
Ctjeep200
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Quote:
Originally Posted by Que89YJ
Do you have a burned out bulb?
. The past owner had out an aftermarket diamond plate dash in there in did not put the check engine display on there
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post #9 of 10 Old 09-04-2014, 08:27 PM
andyldavis
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Codes

While at the Zone have them pull the codes for you.
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post #10 of 10 Old 09-04-2014, 08:53 PM
mike134
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Quote:
Originally Posted by andyldavis View Post
While at the Zone have them pull the codes for you.
That probably won't work. They don't always have an OBD I scanner or know what they are doing... because autozone is terrible (at least around here)

You'll probably have to buy/make a test light to hook directly up to the CEL port on the vehicle computer. Should only cost a couple bucks.
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