Ok so I'm having some trouble w/my '96 XJ. It's an auto, 206K miles, 4.0, 4x4 and this problem just started yesterday.
When I'm driving down the road all the sudden it started surging & bucking... then it'd drive normal, then it'd surge a bit, then normal, etc... It never died, but when I came to a stop the idle dropped to about 400rpm and then back up as though it was going to die. When the Jeep in in park it idles and revs just fine, but when I put her in drive/reverse I get the surging again.
I checked and couldn't find any broken vacuum lines or disconnected lines in the engine bay. I replaced the fuel filter and my fuel pressure is constant at ~ 51 psi.
The spark plugs and distributor cap have ~ 10-15K miles, but should be in good shape. I just changed the oil last week and that's fine and she doesn't burn any oil (Mobil 1 5W-30).
I found out I don't have an EGR valve (that's strange) or if I do I can't find it. Not sure where my Idle Air Controller is, but she idles fine... just surges under load.
Is there anything electronically that could be shorting out or going bad? Could this be transmission related?
Any suggestions for me to check would be greatly appreciated.
Thanks all
When I'm driving down the road all the sudden it started surging & bucking... then it'd drive normal, then it'd surge a bit, then normal, etc... It never died, but when I came to a stop the idle dropped to about 400rpm and then back up as though it was going to die. When the Jeep in in park it idles and revs just fine, but when I put her in drive/reverse I get the surging again.
I checked and couldn't find any broken vacuum lines or disconnected lines in the engine bay. I replaced the fuel filter and my fuel pressure is constant at ~ 51 psi.
The spark plugs and distributor cap have ~ 10-15K miles, but should be in good shape. I just changed the oil last week and that's fine and she doesn't burn any oil (Mobil 1 5W-30).
I found out I don't have an EGR valve (that's strange) or if I do I can't find it. Not sure where my Idle Air Controller is, but she idles fine... just surges under load.
Is there anything electronically that could be shorting out or going bad? Could this be transmission related?
Any suggestions for me to check would be greatly appreciated.
Thanks all