2001 xj sport 4.0 4dr Check engine light
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2001 xj sport 4.0 4dr Check engine light
I got a check engine light and it was running rough when I was in gear and parked very low rpm almost wanted to shut down so I my buddy scanned it and I got a 171 which says misfire in bank 1 cylinders 1 and 3 where misfiring so I changed the plugs three of them were completely charred after that was done we started it back up and it sounded a lot better and ran good for about 25 miles Then the check engine light came back on.
Any ideas?
Any ideas?
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Model: Cherokee
Is it the same code causing the CEL?
I'd pull the new plugs out and look at them. See if they already have carbon buildup or oil on them or anything. Change the wires, distributor cap, rotor. Change your air filter, run a fuel system cleaner through your tank.
I'd pull the new plugs out and look at them. See if they already have carbon buildup or oil on them or anything. Change the wires, distributor cap, rotor. Change your air filter, run a fuel system cleaner through your tank.
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Originally Posted by BEETROOT
Is it the same code causing the CEL?
I'd pull the new plugs out and look at them. See if they already have carbon buildup or oil on them or anything. Change the wires, distributor cap, rotor. Change your air filter, run a fuel system cleaner through your tank.
I'd pull the new plugs out and look at them. See if they already have carbon buildup or oil on them or anything. Change the wires, distributor cap, rotor. Change your air filter, run a fuel system cleaner through your tank.
Yea same code is causing the CEL but I don't think it has wires its a coil pack
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Model: Cherokee
My bad.
But check out this recall.
http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
But check out this recall.
http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
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
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
CF Veteran
Joined: Nov 2010
Posts: 5,840
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
Got to analyze the trouble code properly and chase it until the root cause is found and resolved.
P0171: FUEL SYSTEM TOO LEAN.
1. First thing I would recommend is testing your fuel pressure. Must be done with a gauge, which can be rented from many parts stores if you don't have one. For a 2001, you should have 49 psi, plus or minus 5 psi.
2. If fuel pressure checks out, then I would test your MAP SENSOR, which also is directly involved with fuel/air ratio. You will need a multimeter and a manual that will detail the procedure for testing.
3. Inspect your header for a crack. VERY common on the 4.0. That can lead to a lean conditon.
4. Inspect for any vacuum leaks.
Here is a link to more on this code; there are more than a few possibilities for this trouble code, but the four I've listed above are primary suspects.
http://www.obd-codes.com/p0171
P0171: FUEL SYSTEM TOO LEAN.
1. First thing I would recommend is testing your fuel pressure. Must be done with a gauge, which can be rented from many parts stores if you don't have one. For a 2001, you should have 49 psi, plus or minus 5 psi.
2. If fuel pressure checks out, then I would test your MAP SENSOR, which also is directly involved with fuel/air ratio. You will need a multimeter and a manual that will detail the procedure for testing.
3. Inspect your header for a crack. VERY common on the 4.0. That can lead to a lean conditon.
4. Inspect for any vacuum leaks.
Here is a link to more on this code; there are more than a few possibilities for this trouble code, but the four I've listed above are primary suspects.
http://www.obd-codes.com/p0171
Last edited by tjwalker; Oct 1, 2012 at 05:18 PM.
Member
Joined: Jun 2012
Posts: 138
Likes: 0
From: Central Frontenac, ON Canada
Year: 2001
Model: Cherokee
Engine: 4.0
My bad.
But check out this recall.
http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
But check out this recall.
http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
SUBJECT:
4.0L Rough Engine Idle After Restart Following A Hot Soak
4.0L Rough Engine Idle After Restart Following A Hot Soak
Thanks man, again, GREAT piece of the Cherokee puzzle!!
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