Does it start to shake like it's about to stall? Do your RPM's drop when at idle?

 

Yeah it doesn't stall though just shakes. My rpms drop too.

 

Shot in the dark here and others may chime in to say i'm a complete idiot but in the process of flushing the system could the TPS have accidentally gotten wet? I know it's in a different part of the engine compartment but I've had hoses slip out of my hands before and soak things.

 

The throttle position sensor? Nah, that's not it. the innards are protected by the air tube, and the external housing can get wet. I'm still doing the math in my head about what else it could be though.

 

I was under the impression that you didn't want to get the exterior of it wet (gleaned this from all the "washed my engine and it won't run right" threads I read during the summer). Still brainstorming on other causes of the poor running though lol.

 

hmm, no not that I've ever seen. I degrease and hose down the engine whenever it needs it (this on my old one, my 2k1 doesn't get too dirty) and it runs fine wet... even the distributor seems to stay dry.

 

Is there a possibility that it could be a bad exhaust valve? I am hoping its something simpler...

 

That one I can't comment on, I don't know much about how the exhaust affects the XJ.

One quick thing you can try is to reset the computer. Disconnect both battery cables and then touch the positive and negative ends to each other for a few seconds. Should reset the brain, might help rebalance your idle and smooth it out a bit.

This isn't necessarily the answer, but doing the simple things first at least rules them out.

 

You replaced it? A lot of stuff has to come off when you replace the head gasket. Make sure all connectors are clean; dielectric grease is a miracle on a nice clean connector, and especially re-check and clean any and all grounds (don't search grounds on here unless you have several hours to read) It may not even be directly related to your recent work.. Have you ever replaced the pre-cat O2 sensor? I recently did mine, and the idle improvment was VERY noticeable. You might clean your IAC too. Just some thoughts.

 

Another thing I have noticed is when I idle sometimes my oil pressure drops lower than normal.. i am lost on this. Any ideas?

 

Reading the story here, sounds like a bad MAP sensor to me.

just my two cents.


cheers!


cpnwrench

 

I was thinking it was my O2 sensor. I had the codes read on it and the O2 sensor came up so I guess I will start there.

 

Well I had to replace a blown hose and my thermostat. But I am having problems with my oil pressure dropping at idle after its warmed up. I had a similar problem before but it dropped the whole way to 0. Now it is dropping to 20 or so. It still has a little bit of a rough idle. And I replaced the oil pressure sending unit a little over a year ago. Is it possible that it has went bad already? Really not sure about this problem but I am concerned. Help would be appreciated! Thanks.