Please help a noobie
05-08-2010, 01:44 PM
#1
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Model: Cherokee
Please help a noobie
Please help a noobie Jeep owner. I bought a 2001 Cherokee Sport this week with 125,000 miles. I think I got a fairly good deal because it needs new brakes, muffler etc.
The one thing that may sabotage me is that engine is giving me the following codes: missfire cylinder 1, missfire cylinder 3, and missfire detected in multiple cylinders.
My local garage checked the ignition components and injectors and said they look ok. They also did a compression test and said that was good.
Their diagnosis was a possible carbon buildup so they said seafoam and drive it and see what happens.
The missfires only seem to happen when it is started. After starting it runs rough and then as soon as you put it in gear and take off it seems to run fine.
I spoke to a jeep specialty place today and they suggested a timing chain.
Any help would be greatly appreciated.
The one thing that may sabotage me is that engine is giving me the following codes: missfire cylinder 1, missfire cylinder 3, and missfire detected in multiple cylinders.
My local garage checked the ignition components and injectors and said they look ok. They also did a compression test and said that was good.
Their diagnosis was a possible carbon buildup so they said seafoam and drive it and see what happens.
The missfires only seem to happen when it is started. After starting it runs rough and then as soon as you put it in gear and take off it seems to run fine.
I spoke to a jeep specialty place today and they suggested a timing chain.
Any help would be greatly appreciated.
05-08-2010, 04:06 PM
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Model: Cherokee
Save your money on the Sea Foam. Good enough stuff but water will de carbon an engine top end just as easy and it is free.
Crank it up and get it to operating temp. Open a vacuum line to the intake and let it suck the water into the engine a little at a time. Not enough to kill the engine but close. It'll steam clean the valves and piston tops
clint
Crank it up and get it to operating temp. Open a vacuum line to the intake and let it suck the water into the engine a little at a time. Not enough to kill the engine but close. It'll steam clean the valves and piston tops
clint
05-08-2010, 06:09 PM
#3
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Year: 1996
Model: Cherokee
Engine: 4.0
Water will work for the carbon but not the injectors. Put a can of seafoam in a half empty tank drive it till almost empty and refuel. Clean the intake.
05-08-2010, 06:09 PM
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Year: 1995
Model: Grand Cherokee
Engine: 5.2 v8
I would use the seafoam, but the 00-01 models seem to have a common issue with misfires...I have no idea what the main root of the issues usually are but i have heard of people putting heat shield stuff around the injectors....something about the gas evaporating before it gets into the cylinders. If I recall correctly most of it is on cylinder #3.
Hopefully someone else will chime in with a bit more knowledge on this, hope that helps some!
Hopefully someone else will chime in with a bit more knowledge on this, hope that helps some!
05-08-2010, 06:19 PM
#6
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Recall Reason FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS
Recall Date APR 08, 2002
Model Affected CHEROKEE
Potential Units Affected 1115322
Recall Summary
ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH A 4.0L ENGINE ONLY, THE DESIGN OF THE INTAKE AND EXHAUST MANIFOLDS COULD ALLOW DEBRIS TO ACCUMULATE AT THE #3 CYLINDER LOCATION.
Consequence
THIS COULD RESULT IN A VEHICLE FIRE.
Remedy
DEALERS WILL INSTALL A MANIFOLD SHIELD TO MODIFY THE AIR FLOW CHARACTERISTICS AND TO PREVENT THE ACCUMULATION OF DEBRIS IN THE AREA OF THE #3 CYLINDER. OWNER NOTIFICATION BEGAN MAY 13, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT DAIMLERCHRYSLER AT 1-800-853-1403.
Notes
DAIMLERCHRYSLER CORPORATION B06
Recall Date APR 08, 2002
Model Affected CHEROKEE
Potential Units Affected 1115322
Recall Summary
ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH A 4.0L ENGINE ONLY, THE DESIGN OF THE INTAKE AND EXHAUST MANIFOLDS COULD ALLOW DEBRIS TO ACCUMULATE AT THE #3 CYLINDER LOCATION.
Consequence
THIS COULD RESULT IN A VEHICLE FIRE.
Remedy
DEALERS WILL INSTALL A MANIFOLD SHIELD TO MODIFY THE AIR FLOW CHARACTERISTICS AND TO PREVENT THE ACCUMULATION OF DEBRIS IN THE AREA OF THE #3 CYLINDER. OWNER NOTIFICATION BEGAN MAY 13, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT DAIMLERCHRYSLER AT 1-800-853-1403.
Notes
DAIMLERCHRYSLER CORPORATION B06
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retreival system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of DaimlerChrysler Corporation.
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
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