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Old 07-25-2007, 12:52 PM   #1 (permalink)
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YJ running like crap

My son has a 1995 YJ with the 4 cyl motor. The problem is, after it has been running for about 10 or 15 miles, it starts to act up and won't accelerate. The tach will bounce from about 2 down to about 8 and back up, and when you step on the throttle, it will bog out. Top speed slows to about 55 mph while this happens. Volts stay about 14, temp stays at 200. Has gas.

We have changed out the thermostat, flushed the rad, put on a new alternator, new coil, new plugs, new plug wires, and a O2 sensor in the exhaust. It appears to be getting plenty of fuel thru the filter at this time.

So, what do I check next? Need to get this running for him, so he quits borrowing mine.
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Old 07-25-2007, 02:06 PM   #2 (permalink)
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catalytic converter.
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Old 07-25-2007, 02:09 PM   #3 (permalink)
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catalytic converter.
Was removed when we redid the exhaust.
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Old 07-25-2007, 02:11 PM   #4 (permalink)
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Plug wires in correct firing order?
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1995 YJ - The usual 1-ton Wrangler
2001 XJ- The unsual 3/4 ton Cherokee
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1998 TJ Sahara Weekend warrior/DD

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Old 07-25-2007, 02:48 PM   #5 (permalink)
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Plug wires in correct firing order?
Yes, double checked that again after we replaced them with new ones.
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Old 07-25-2007, 03:16 PM   #6 (permalink)
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My 90' 4cyl yj was doing that... I was putting on a new cap and noticed the whole distributor was loose. I tightend it up and it runs like a champ. try going onlong and tighten up any loose bolts in the engine bay... I thought I had bigger problems then I did. I replaced, the wires, plugs, cap, o2 sensor, tps, adjusted the idle.... on and on... and it was just a loose distributor. Hope this helps. Good luck with it.
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Old 07-25-2007, 03:31 PM   #7 (permalink)
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My 90' 4cyl yj was doing that... I was putting on a new cap and noticed the whole distributor was loose. I tightend it up and it runs like a champ. try going onlong and tighten up any loose bolts in the engine bay... I thought I had bigger problems then I did. I replaced, the wires, plugs, cap, o2 sensor, tps, adjusted the idle.... on and on... and it was just a loose distributor. Hope this helps. Good luck with it.
Damn! Never thought of that one. Will check it out as well. He does wheel this thing so no doubt things may have come loose.
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Old 07-26-2007, 09:10 AM   #8 (permalink)
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Does the ck. engine light come on. If so there should be a code in the controler.Cycle key 3 times leaving key on the third time count the blinks on the ck. engine light.
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Old 07-26-2007, 10:50 AM   #9 (permalink)
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disconnect the tach. i had a tach go bad and was intermittently grounding causing a missfire.
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Old 07-26-2007, 11:09 AM   #10 (permalink)
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Does the ck. engine light come on. If so there should be a code in the controler.Cycle key 3 times leaving key on the third time count the blinks on the ck. engine light.
Check engine light does not come on at all. We did do a scan on it and got an O2 sensor code. Replaced that, and it still runs the same.

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disconnect the tach. i had a tach go bad and was intermittently grounding causing a missfire.
Disconnect the tach at the distributor then and run it that way? Will try it out.
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Old 07-26-2007, 03:02 PM   #11 (permalink)
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Tried it with the tach disconnected, no change. Any way to test the fuel rail?
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Old 07-26-2007, 03:24 PM   #12 (permalink)
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Yes, there should be a little purge valve on it to see if your getting good fuel pressure. Are the injectors factory I had sonme go bad in mine and it wouldnt run right.
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2001 XJ- The unsual 3/4 ton Cherokee
2006 Cummins - Tow rig
1998 TJ Sahara Weekend warrior/DD

[url]http://www.americanfourwheeler.com[/url]
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