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Old 06-21-2013, 08:07 PM   #1
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Hard to start after engine is warm

I have a 2004 wrangler 4.0 with auto trans. When the engine is cold it starts on the first try, no problem. Once the engine is up to temp range, and you shut it off, then try to restart, you have to crank it twice. Every time I stop cranking for the first attempt, then try a second time, it starts.
Can anyone point me in a direction to look for solving this problem.

Thanks
Hotwire

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Old 06-29-2013, 03:28 PM   #2
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I have a different symptom, same condition. Starts and runs great, but shut it off warm and start up 10 min later and it sputters and acts like its flooded. No check engine and seems to run fine once started

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Old 06-29-2013, 06:07 PM   #3
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You might look into a condition called vapor lock around the fuel injector #3. It involves installing a heat insulating sleeve around your injectors.
Here's the TSB :

Fuel System - Hot Start Misfire/MIL ON/DTC's/Rough Idle

NUMBER: 18-031-03

GROUP: Vehicle Performance

DATE: Sep. 05, 2003

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 ********S 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 (90°F) 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

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).
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Old 06-29-2013, 06:46 PM   #4
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Awesome info!!! No insulators on them now as far as I can see, will look into it!
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Old 07-09-2013, 05:59 PM   #5
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good info thanks, I will be checking with the dealer soon. Its not my daily driver but gets frustrating when it happens
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Old 07-09-2013, 07:35 PM   #6
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What's the success rate of this repair? I've got the same issue.

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