2001 with heat soak problem...how do I fix it?
Thread Starter
Seasoned Member
Joined: Feb 2009
Posts: 309
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From: OKC, OK
Year: 2001
Model: Cherokee
Engine: 4.0L
2001 with heat soak problem...how do I fix it?
My 2001 XJ is having some heat soak problems and it's getting old....how do I fix it? Love the jeep but can't stand that if I do a short stop and bet back in it run terrible and pops a CEL and I have to wait till it cools off to go again.
What are my options?
thanks,
Bobby
What are my options?
thanks,
Bobby
CF Veteran
Joined: Sep 2010
Posts: 21,168
Likes: 5
From: Milwaukee, WI
Year: 1987
Engine: Check
+1 on figuring out what codes have been tripped. That should be first on your priority list.
For actual solutions to higher running temps, look into lower temp thermostats. Do a coolant flush if you haven't, and make sure you use the propper water/coolant mix. If that is still not enough, look into electric fans and set them to turn on a bit sooner than they normally would.
As a last chance you can try upgrading your radiator, but that can be a bit more expensive than all the other 'fixes' combined.
For actual solutions to higher running temps, look into lower temp thermostats. Do a coolant flush if you haven't, and make sure you use the propper water/coolant mix. If that is still not enough, look into electric fans and set them to turn on a bit sooner than they normally would.
As a last chance you can try upgrading your radiator, but that can be a bit more expensive than all the other 'fixes' combined.
Thread Starter
Seasoned Member
Joined: Feb 2009
Posts: 309
Likes: 0
From: OKC, OK
Year: 2001
Model: Cherokee
Engine: 4.0L
Misfire #3 P0303. I have a scan guage in my jeep so I can clear the code...but after sitting for about 15 mins after driving it and you get back in on a hot day....it does this....after cool down (of longer than 30 mins...helps if I open the hood too) it starts up and runs fine.
Thread Starter
Seasoned Member
Joined: Feb 2009
Posts: 309
Likes: 0
From: OKC, OK
Year: 2001
Model: Cherokee
Engine: 4.0L
I though these jeeps did not like to run too cool.....I hear that 210 is were it likes to be to run well? BTW it only does this on really hot days with short stops in between driving to and fro.
Junior Member
Joined: Jun 2009
Posts: 42
Likes: 0
From: IL
Year: 2001
Model: Cherokee
Engine: 4.0
There is a TSB for this issue:
1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supercedes 1802702 dated 09/06/02)
Model Year(s): 1999-2004
Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.
Details: Customers may describe a 20 to 30 second rough idle following the restart of a heat soaked engine. This condition may be most noticeable when the engine is restarted following a prior 10 to 20 minute heat soak in hot ambient conditions of approximately 32 C (90ºF) or higher. This condition may be consistent with short city stop-and-go driving trips and can be aggravated by the use of fuel with a high ethanol content. Depending upon various conditions a MIL may occur due to DTC P0303 - Cylinder #3 Misfire.
This condition may be caused by heat from the exhaust manifold that following engine shut down migrates to the area around injector #3 and causes fuel vapor to form within the injector. This in turn may cause a momentary misfire of cylinder #3 until the fuel vapor is cleared of injector #3. The insulator sleeve lowers the injector #3 temperature to a point below which the fuel will not normally vaporize.
If vehicle exhibits a rough idle, and if a misfire of cylinder #3 is observed following a 10 to 20 minute hot soak, perform the Repair Procedure.
Parts required:
56028371AA Ignition Wire Shield
Repair procedure:
1. Cut insulator sleeve, p/n 56028371AA, to make two (2) insulator sleeves about 25-30 mm (1 in.) in length. See diagram.
2. Install one sleeve around injector #3, with the slit on the upward facing side of the injector. Install the other sleeve with the slit on the downward facing side of the injector.
3. Confirm sleeve is flush to intake manifold surface around injector.
4. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position (from driver’s side of vehicle).
Date: 09/05/03 (supercedes 1802702 dated 09/06/02)
Model Year(s): 1999-2004
Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.
Details: Customers may describe a 20 to 30 second rough idle following the restart of a heat soaked engine. This condition may be most noticeable when the engine is restarted following a prior 10 to 20 minute heat soak in hot ambient conditions of approximately 32 C (90ºF) or higher. This condition may be consistent with short city stop-and-go driving trips and can be aggravated by the use of fuel with a high ethanol content. Depending upon various conditions a MIL may occur due to DTC P0303 - Cylinder #3 Misfire.
This condition may be caused by heat from the exhaust manifold that following engine shut down migrates to the area around injector #3 and causes fuel vapor to form within the injector. This in turn may cause a momentary misfire of cylinder #3 until the fuel vapor is cleared of injector #3. The insulator sleeve lowers the injector #3 temperature to a point below which the fuel will not normally vaporize.
If vehicle exhibits a rough idle, and if a misfire of cylinder #3 is observed following a 10 to 20 minute hot soak, perform the Repair Procedure.
Parts required:
56028371AA Ignition Wire Shield
Repair procedure:
1. Cut insulator sleeve, p/n 56028371AA, to make two (2) insulator sleeves about 25-30 mm (1 in.) in length. See diagram.
2. Install one sleeve around injector #3, with the slit on the upward facing side of the injector. Install the other sleeve with the slit on the downward facing side of the injector.
3. Confirm sleeve is flush to intake manifold surface around injector.
4. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position (from driver’s side of vehicle).
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