91 YJ 2.5 sputtering and dying - JeepForum.com
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Unread Today, 10:05 AM   #1
1998 XJ Cherokee 
Join Date: Mar 2004
Posts: 178
91 YJ 2.5 sputtering and dying

I have been plagued by this issue recently. I'll be driving my YJ and the engine will flutter/sputter and lose power. Occasionally I can pop it into neutral and rev the engine to have it recover but only for a short period of time. It will eventually die. When it dies it won't start again.... at least for a while. Sometimes I can start it up within 30 minutes sometimes it takes several hours before it will start. Starter always cranks.

It is a 2.5 cylinder with a manual transmission.

Here's what I have done:

Fuel pump has been replaced recently
Fuel filter is almost brand new
Fuel pressure regulator is brand new.
Fuel pressure is constant. (drove with fuel pressure guage in the cab and it was normal when it died last time)
MAP has been replaced.

Plugged a scanner in and am not getting codes,

What's next? I'm at a loss.

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Unread Today, 10:10 AM   #2
Registered User
1994 YJ Wrangler 
Join Date: Jun 2013
Location: New York, NY
Posts: 28
Is it throwing any codes? Check engine light on? Did you cycle key to see if any codes are stored, even if there is no check engine light.

Sounds like you experiencing similar issues to me. Most people are telling me to look into the timing, and see if the chain jumped a tooth. I have a 4.0L so it is different than you, but it might be worth looking into obviously.

I also had a Grand Cherokee which had similar issues. It was an automatic, and it would lose power, run rough, and eventually die. Did it to me on the highway at one point. I swapped out the Throttle Positioning Sensor, and drove it 1500 miles home with no issues. Might be worth your time to swing by an Autozone, purchase the sensor, and return it if it doesn't help.
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Unread Today, 01:47 PM   #3
1998 XJ Cherokee 
Join Date: Mar 2004
Posts: 178
No check engine light. No codes thrown.
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