Hi, i own a 2000 XJ and if i drive the jeep until it hits operating temp, shut it off, then restart it with 15 minutes, it runs really rough. But if I let the engine cool completely it starts no problem. Was thinking it was the fuel pressure regulator, but not sure. Please help.
Need help troubleshooting a 2000 XJ
- Thread starter Daywalker
- Start date
MudderChuck
New member
Never had 2000 myself, but have read about heat problems on the fuel rail. Not sure if it was the 2000 model or not but Jeep came up with a heat wrap kit for this problem, that from most accounts didn't help much.
Seems to be a bunch of guys trying to figure out a way to wire a timer, so the aux fan stays on for awhile after the motor is shut down, to help with the problem.
Seems to be a bunch of guys trying to figure out a way to wire a timer, so the aux fan stays on for awhile after the motor is shut down, to help with the problem.
MudderChuck
New member
I have no need so I haven't mixed in the discussion. Any timer would likely work, the discussion seems to be the best way to wire it. Which in my opinion is kind of overkill, it isn't that complicated.
I'd likely mount a Kixon (primitive thermostat) onto the fuel rail and have the aux fan come on if a certain temperature is achieved. Not that big of a deal, wire in another relay (maybe a diode).
You can likely check to see if heat is your problem, by cracking the hood the next time you shut down on a hot motor and see what happens after ten minutes. If the problem disappears it is likely the heat.
On Renix models the CPS was somewhat heat sensitive, the resistance values changed with the heat. A marginal CPS would malfunction with temperature changes. I surly don't know if this is an issue in the later models or not.
I'd likely mount a Kixon (primitive thermostat) onto the fuel rail and have the aux fan come on if a certain temperature is achieved. Not that big of a deal, wire in another relay (maybe a diode).
You can likely check to see if heat is your problem, by cracking the hood the next time you shut down on a hot motor and see what happens after ten minutes. If the problem disappears it is likely the heat.
On Renix models the CPS was somewhat heat sensitive, the resistance values changed with the heat. A marginal CPS would malfunction with temperature changes. I surly don't know if this is an issue in the later models or not.
MudderChuck
New member
Do you have the heat wrap on your center injectors? I'd hate to steer you down the wrong path.
FloridaCherokee1988
New member
I'd check that fuel pressure regulator too man, if the heat wrap on the fuel rail doesn't solve it. I replaced the regulator a little while ago on a 90' Ranger that had the same symptoms you described, runs great now.
SteelHeadz
Super Moderator
X2, install a fuel pressure test gauge on the fuel rail and monitor it for erratic and or drop in pressure from the specified min. threshold.
Bounty__Hunter
Super Moderator
I was gonna suggest heat soak of the #3, pretty common problem. There may even be a TSB about a heat shield.
SteelHeadz
Super Moderator
Ha!! what was i thinking?!?, your right BH. I looked for it and here it is. Sorry i didnt do my homework
.TSB 18-027-02. This TSB involves the installation of a fuel injector insulator sleeve. Customers may complain of a rough idle for 20-30 seconds after a 10-20 minute soak in hot ambient conditions, around 90 degrees F., after short city driving trips. This condition can be aggravated by high ethanol content in the fuel the customer is using. This condition is caused by heat from the exhaust manifold that, during shut down, migrates to the area around injector #3 and causes vapor to form in the injector. This in turn causes a misfire of cylinder #3. The insulator sleeve lowers the injector #3 temperature to a point which the fuel will not vaporize.
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