'01 XJ Misfire in Cylinder 3
#1
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Join Date: Dec 2009
Location: Vancouver, BC, Canada
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Year: 2001
Model: Cherokee
Engine: 4.0
'01 XJ Misfire in Cylinder 3
Anybody know what might cause this?
All plugs are new.
Could it be the Coil pack?
Any ideas?
All plugs are new.
Could it be the Coil pack?
Any ideas?
#2
CF Veteran
TSB 18-031-03
Link http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
Link http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
This bulletin is supplied as technical information only and is not an authorization for repair.
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-027-02,
DATED SEPTEMBER 06, 2002, WHICH SHOULD BE REMOVED FROM
YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS
HAVE BEEN USED TO HIGHLIGHT REVISIONS.
SUBJECT:
4.0L Rough Engine Idle After Restart Following A Hot Soak
OVERVIEW:
This bulletin involves the installation of a fuel injector insulator sleeve.
MODELS:
2000-2004 (TJ) Wrangler (Domestic and International Markets)
1999-2004 (WJ) Grand Cherokee (Domestic and International Markets)
2001-2004 (WG) Grand Cherokee (International Market)
2000-2001 (XJ) Jeep Cherokee (Domestic and International Markets)
NOTE: This bulletin applies to vehicles equipped with a 4.0L engine (sales code = ERH)
SYMPTOM/CONDITION:
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.
DIAGNOSIS:
1. 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:
Qty. Part No. Description
1 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.
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).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE: 0.2hrs
FAILURE CODE:
AM Authorized Modification
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-027-02,
DATED SEPTEMBER 06, 2002, WHICH SHOULD BE REMOVED FROM
YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS
HAVE BEEN USED TO HIGHLIGHT REVISIONS.
SUBJECT:
4.0L Rough Engine Idle After Restart Following A Hot Soak
OVERVIEW:
This bulletin involves the installation of a fuel injector insulator sleeve.
MODELS:
2000-2004 (TJ) Wrangler (Domestic and International Markets)
1999-2004 (WJ) Grand Cherokee (Domestic and International Markets)
2001-2004 (WG) Grand Cherokee (International Market)
2000-2001 (XJ) Jeep Cherokee (Domestic and International Markets)
NOTE: This bulletin applies to vehicles equipped with a 4.0L engine (sales code = ERH)
SYMPTOM/CONDITION:
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.
DIAGNOSIS:
1. 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:
Qty. Part No. Description
1 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.
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).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE: 0.2hrs
FAILURE CODE:
AM Authorized Modification
#3
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Join Date: Feb 2010
Location: Avon, OH
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Year: 2000
Model: Cherokee
Engine: 4 liter
Yup, exact same thing happens to me, I have a 2000 XJ. After rough driving and hitting higher RPM's if I turn the car off and then wait, and only if I wait, not if I start it backup right away, the idle is really rough. The idle only goes away really if I rev the engine, and the engine light is on a lot and the error code is misfire cylinder #3. My mechanic who is very talented and extremely knowledgeable if baffled, so the service bulletin makes a lot of sense.
#7
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Join Date: Nov 2010
Location: In the middle of Minnesota!
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Year: 1999
Model: Cherokee
Engine: 4.0
Very common problem.
I will tell you though that many have had mixed (poor) luck with the injector shield fix that Jeep recommends.
In hot climates where this can be even more troublesome, many have gone to louvers, special e-fan controls, etc. SEARCH for "heatsoak" and you'll find more on this.
I will tell you though that many have had mixed (poor) luck with the injector shield fix that Jeep recommends.
In hot climates where this can be even more troublesome, many have gone to louvers, special e-fan controls, etc. SEARCH for "heatsoak" and you'll find more on this.
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#9
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Location: lewiston,maine
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Year: 1999
Model: Cherokee
Engine: 4.0 straight 6
I actually had the same problem i could hear it n ya my jeep sometimes would bogg Right out n id be feathering the gas like a fool so im glad i found this post ,would it cause it not to start ? I have a 99
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