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Old 03-20-2012, 08:01 PM   #1
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Rough Idle at operating Temp

I've been noticing lately after my Jeep is warmed up and shut down the next time I start it it's idling very rough, like 1 cylinder isn't firing. Doesn't seem to happen on a cold engine, and once I drive away it seems to clear up. CEL isn't on, Haven't checked to see if there are any codes yet (may do this tomorrow). Anyone else run into this? I'm thinking maybe and IAC valve going bad, or maybe a coil pack that is starting to break down.

2001, 4.0 BTW

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Old 03-20-2012, 08:28 PM   #2
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My xj did that, if it throws a code it will probably be a cylinder misfire code. Both times it did this, I replaced the spark plugs and it started up fine after it. Plus replacing the spark plugs is cheap, like $20 if you just go with the champions.

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Old 03-20-2012, 08:39 PM   #3
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Was thinking of new plugs anyway, just checking to see if there was anything common
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Old 03-20-2012, 08:43 PM   #4
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Quote:
Originally Posted by grnd93
Was thinking of new plugs anyway, just checking to see if there was anything common
Yeah, my xj would love to do that especially on a hot day. Replaced the plugs and it was fine.
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Old 03-21-2012, 07:27 PM   #5
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Found this on PBB

Do a search for the TSB pertaining to this problem.<br />
<br />
The TSB has you install an insulating sleeve on the #3 fuel injector body...<br />
<br />
--------------------------------------------------------------------------<br />
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.<br />
<br />
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-027-02,<br />
DATED SEPTEMBER 06, 2002, WHICH SHOULD BE REMOVED FROM<br />
YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS<br />
HAVE BEEN USED TO HIGHLIGHT REVISIONS.<br />
<br />
SUBJECT:<br />
4.0L Rough Engine Idle After Restart Following A Hot Soak<br />
<br />
OVERVIEW:<br />
This bulletin involves the installation of a fuel injector insulator sleeve.<br />
<br />
MODELS:<br />
2000-2004 (TJ) Wrangler (Domestic and International Markets)<br />
1999-2004 (WJ) Grand Cherokee (Domestic and International Markets)<br />
2001-2004 (WG) Grand Cherokee (International Market)<br />
2000-2001 (XJ) Jeep Cherokee (Domestic and International Markets)<br />
NOTE: This bulletin applies to vehicles equipped with a 4.0L engine (sales code = ERH)<br />
<br />
SYMPTOM/CONDITION:<br />
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 (90║F)or higher. <br />
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.<br />
<br />
Depending upon various conditions a MIL may occur due to DTC P0303 - Cylinder #3 Misfire.<br />
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.<br />
<br />
The insulator sleeve lowers the injector #3 temperature to a point below which the fuel will not normally vaporize.<br />
<br />
DIAGNOSIS:<br />
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.<br />
<br />
PARTS REQUIRED:<br />
Qty. Part No. Description<br />
<br />
1 56028371AA Ignition Wire Shield<br />
<br />
REPAIR PROCEDURE:<br />
1. Cut insulator sleeve, p/n 56028371AA, to make two (2) insulator sleeves<br />
about 25-30 mm (1 in.) in length.<br />
2. Install one sleeve around injector #3, with the slit on the upward facing side of the<br />
injector. Install the other sleeve with the slit on the downward facing side of the injector.<br />
3. Confirm sleeve is flush to intake manifold surface around injector.<br />
4. Check injector #3 wire and ensure that the injector is rotated to a 2 o’clock position (from driver’s side of vehicle).<br />
<br />
POLICY:<br />
Reimbursable within the provisions of the warranty.<br />
TIME ALLOWANCE: 0.2hrs<br />
<br />
FAILURE CODE:<br />
AM Authorized Modification

I did the plugs tonight...old ones were very worn, possibly original...if nothing else my mileage should improve
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Old 03-21-2012, 07:46 PM   #6
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Had this happen on the way home today!!!
here's what I did to fix it (so far, so good.)

http://www.wranglerforum.com/f5/roug...ue-147976.html

The Mrs took it to her ceramics class tonight, got a text asking what I did to the jeep because "its smoother than the car." LOL.

Good luck man!
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Old 03-21-2012, 08:19 PM   #7
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I also hit the TB with some carb cleaner...could have done a better job but it was getting dark.
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Old 05-06-2012, 06:36 AM   #8
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I had the same problem, after replacing the plugs, coil pack and cleaning everything the problem continued.

The code gives cylinder # 3 misfire and yes there is a technical bulletin regarding a heat sleeve for the fuel injector.

After I tried all these things I finally replaced all four O2 sensors and the problem is gone.

Hope this helps.....
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Old 05-06-2012, 08:42 AM   #9
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My 97 tj with a 2.5 is doing the same thing does the insulator sleeve bulliten above apply to the 4 cylinder as well

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