YJ running like crap - Pirate4x4.Com : 4x4 and Off-Road Forum

Icemanii · 07-25-2007, 12:52 PM

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.

wckdyj · 07-25-2007, 02:06 PM

catalytic converter.

Icemanii · 07-25-2007, 02:09 PM

Quote:

Originally Posted by wckdyj

catalytic converter.

Was removed when we redid the exhaust.

BROKE_ASS_YJ · 07-25-2007, 02:11 PM

Plug wires in correct firing order?

Icemanii · 07-25-2007, 02:48 PM

Quote:

Originally Posted by BROKE_ASS_YJ

Plug wires in correct firing order?

Yes, double checked that again after we replaced them with new ones.

Pallister · 07-25-2007, 03:16 PM

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.

Icemanii · 07-25-2007, 03:31 PM

Quote:

Originally Posted by Pallister

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.

wranglerwilson · 07-26-2007, 09:10 AM

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.

j.kimball · 07-26-2007, 10:50 AM

disconnect the tach. i had a tach go bad and was intermittently grounding causing a missfire.

Icemanii · 07-26-2007, 11:09 AM

Quote:

Originally Posted by wranglerwilson

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.

Quote:

Originally Posted by j.kimball

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.

Icemanii · 07-26-2007, 03:02 PM

Tried it with the tach disconnected, no change. Any way to test the fuel rail?

BROKE_ASS_YJ · 07-26-2007, 03:24 PM

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.

07-25-2007, 12:52 PM	#1 (permalink)
Icemanii Registered User Join Date: Oct 2005 Member # 55458 Location: 48085 Posts: 461	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.

07-25-2007, 02:11 PM	#4 (permalink)
BROKE_ASS_YJ Registered User Join Date: Feb 2007 Member # 86828 Location: HILLBILLY HELL! Posts: 1,156	Plug wires in correct firing order? __________________ 1995 YJ - The usual 1-ton Wrangler 2001 XJ- The unsual 3/4 ton Cherokee 2006 Cummins - Tow rig 1998 TJ Sahara Weekend warrior/DD [url]http://www.americanfourwheeler.com[/url]

07-26-2007, 03:24 PM	#12 (permalink)
BROKE_ASS_YJ Registered User Join Date: Feb 2007 Member # 86828 Location: HILLBILLY HELL! Posts: 1,156	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. __________________ 1995 YJ - The usual 1-ton Wrangler 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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07-25-2007, 02:06 PM	#2 (permalink)
wckdyj Registered User Join Date: Oct 2002 Member # 14139 Location: Delaware Posts: 195	catalytic converter.

07-25-2007, 03:16 PM	#6 (permalink)
Pallister Registered User Join Date: Dec 2006 Member # 84406 Location: Victoria B.C Canada Posts: 74	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.

07-26-2007, 09:10 AM	#8 (permalink)
wranglerwilson Registered User Join Date: Feb 2007 Member # 87682 Posts: 600	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.

07-26-2007, 10:50 AM	#9 (permalink)
j.kimball Registered User Join Date: Sep 2005 Member # 53125 Location: San Diego Posts: 238	disconnect the tach. i had a tach go bad and was intermittently grounding causing a missfire.

07-26-2007, 03:02 PM	#11 (permalink)
Icemanii Registered User Join Date: Oct 2005 Member # 55458 Location: 48085 Posts: 461	Tried it with the tach disconnected, no change. Any way to test the fuel rail?