Stumbling at 2200 rpms - JeepForum.com

 
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post #1 of 12 Old 11-07-2013, 06:12 PM Thread Starter
skates04
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Stumbling at 2200 rpms

Trying to help a buddy fix his YJ, Its a 95 with the 2.5L, motor is stock, 5spd, jeep has about 70,000 miles on it.

Basically what is happening is between 2000-2500rpms there is a hesitation or it will stumble and will not accelerate any more, sometimes it will back fire. Happens a bit in 2nd gear, but mostly in 3rd under load.

When the Jeep is cold it seems to run fine. Becomes an issue after it warms up.

Also the Temp gauge is reading low, usually stays around the first tick mark above 100. We still get really good heat.

Changed the following:
Fuel Filter
02 Sensor
Map Sensor
Cap, Rotor, Wires and plugs are good.


He is picking up a TPS sensor in the morning and will get a new Theromstat gasket so we can see if the stat is stuck open. The cat seems solid when we bang on it, no rattling or anything. Were debating on the CPS, does the 95 have the same harness issues?

We have both done a lot of searching; seems others have had this issue with a ton of different solutions.

Any idea's?

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post #2 of 12 Old 11-08-2013, 05:30 PM Thread Starter
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post #3 of 12 Old 11-11-2013, 10:16 AM
Que89YJ
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Did you run the codes?
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post #4 of 12 Old 11-11-2013, 01:22 PM
Peety
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Check the cam and crank sensors, 200 ohms +/- 75, both should make around 5v while cranking/running. It sounds like the ignition timing is way out of whack.
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post #5 of 12 Old 11-11-2013, 02:16 PM
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Quote:
Originally Posted by Que89YJ View Post
Did you run the codes?
They seem to never check the codes and just start throwing parts at it.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #6 of 12 Old 11-11-2013, 05:00 PM
Que89YJ
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Use the key method and check your codes.
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post #7 of 12 Old 11-11-2013, 06:37 PM
jbolty
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maybe timing advance, either vacuum or mechanical. try it with the vacuum hose disconnected and plugged.

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post #8 of 12 Old 11-11-2013, 08:06 PM
Que89YJ
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This is how to check codes. Advance is computer controlled.
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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post #9 of 12 Old 11-11-2013, 08:42 PM
jbolty
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Quote:
Originally Posted by Que89YJ View Post
This is how to check codes. Advance is computer controlled.
http://www.jeepforum.com/forum/f12/h...codes-1257145/
good point, didn't notice it's a 4 cyl.

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post #10 of 12 Old 11-12-2013, 10:58 AM
Fozzybear42
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At some point after ruling out a couple other things QUE will tell you to check fuel pressure. Make sure you do it while driving, not just idle. It will save you money, time, sanity...etc.
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post #11 of 12 Old 11-12-2013, 11:11 AM
Que89YJ
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LOL Fozzy now that is funny. What he said, but check the codes and post what you find.
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post #12 of 12 Old 11-30-2013, 04:24 AM Thread Starter
skates04
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Sorry for the late reply, this is for a buddy and we haven't had time to mess with it... We did check the codes and we had an o2 sensor code, with a lean and rich condition. We did replace the sensor. I believe we also had a #3 Cylinder Mis-Fire.

We were also thinking timing, but yes 2.5L so computer controlled. I did check it still and it was a few degrees before TDC
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