Runs rough when hot
10-15-2008, 09:23 AM
#1
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Year: 1996
Model: Cherokee
Engine: 4.0
Runs rough when hot
ok this only happens when i get the jeep over 210!!!! (no electric fan)
I know its not good.
When i shut the jeep off at 210 and restart it a few minutes later it runs really rough and the oil pressure has like 10 psi. If i hold it to the floor it starts running fine after about a minute.
Anybody else have this problem? i know i need an electric fan, got one on its way. I am thinking some type of sensor?
10-15-2008, 03:37 PM
#3
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Year: 1996
Model: Cherokee
Engine: 4.0
yea thats what i thought my old chevy did that too(exhaust to close to a line) but ussually fuel injected motors dont have that prob
10-15-2008, 05:16 PM
#4
Heat + '01 Cylinder head = Nothing but trouble.
The '01 heads (casting Number 0331) are prone to cracking. Running the motor without an electric fan is a ticking timebomb.
The '01 heads (casting Number 0331) are prone to cracking. Running the motor without an electric fan is a ticking timebomb.
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10-15-2008, 06:50 PM
#8
1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supersedes 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 (supersedes 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
10-16-2008, 06:27 AM
#10
Short Bus Motorsports
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Year: 2001
Model: Cherokee
Engine: 4.0
No recall but a TSB from Jeep. Parts are not expensive and it does help. I have the same heat soak issue.
Last edited by xjjeepthing; 10-16-2008 at 06:33 AM.
10-16-2008, 08:30 AM
#12
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Year: 1991
Model: Cherokee
Engine: 4.0 I6
good find Frankz...I knew I had heard of this but could not for the life of me remember where.. Where did you find this TSB?
10-16-2008, 10:38 AM
#14
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Year: 1996
Model: Cherokee
Engine: 4.0
