Injector Upgrade 1996 4.0L
03-08-2021, 02:58 PM
#1
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.0
Injector Upgrade 1996 4.0L
I plan on upgrading to Bosch 4 hole injectors. I have been watching different videos and reading different posts and articles on the process. It seems simple enough but now I have a question. It seems from my search that the 97 model and up had a manifold heat shield installed to prevent the fuel rail from heating up. My 1996 never had one unless it was removed over 22 years ago. Should I be concerned about not installing a heat shield? My cooling system is in perfect condition and can sit and idle all day at 195-200 degrees...
03-08-2021, 04:18 PM
#2
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The Heat Soak thing (where heating the injectors up actually caused a problem) in the TSB was for 1999 and up. Don't know if there were issues besides that.
TSB #1803103
TSB 1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supersedes 1802702 dated 09/06/02)
Model Year(s): 1999-2004
Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.
Details: 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.
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:
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. See diagram.
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.
TSB 1803103 - 4.0L ROUGH ENGINE IDLE AFTER RESTART FOLLOWING A HOT SOAK
Date: 09/05/03 (supersedes 1802702 dated 09/06/02)
Model Year(s): 1999-2004
Description: NOTE: This bulletin applies to vehicles equipped with a 4.0L engine. This bulletin involves the installation of a fuel injector insulator sleeve.
Details: 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.
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:
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. See diagram.
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.
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BlueRidgeMark (03-09-2021)
03-08-2021, 04:40 PM
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Year: 2000
Model: Cherokee (XJ)
The only reason I used CBXCB0060 was cause I did not know that kit existed.
Despite not having any heat soak issues I would have used it when I did the 4 hole injector upgrade.
I replaced my factory one cause it was shot.
Oh and my Jeep dealership had it in stock.
With tax I don't think that even cost me $3.
Would have to check my files to be sure. LOL.
Despite not having any heat soak issues I would have used it when I did the 4 hole injector upgrade.
I replaced my factory one cause it was shot.
Oh and my Jeep dealership had it in stock.
With tax I don't think that even cost me $3.
Would have to check my files to be sure. LOL.
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BlueRidgeMark (03-09-2021)
03-09-2021, 01:33 AM
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I was not. LOL.
But to defend myself look at the list price.
I only saved 55 cents off it. LOL.
Oh and sales tax here is 6.35%.
I do remember that they did have it in stock.
Cause that really surprised me.
03-09-2021, 01:58 AM
#10
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Year: 2000
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Oh and if makes you guys feel any better I did get kinda raped on the fuel clip.
Doesn't even hold the fuel line to the fuel rail. The fuel line is a quick connect.
More a safety/backup thing.
But I put in a new fuel rail too and just wanted a new one of those too so......
Doesn't even hold the fuel line to the fuel rail. The fuel line is a quick connect.
More a safety/backup thing.
But I put in a new fuel rail too and just wanted a new one of those too so......
03-09-2021, 11:51 AM
#12
Seasoned Member
You buy it to prevent a problem from existing. Imagine you're in the thick of it and your jeep is running hot that day and all you need to do is get home but you kill your jeep going up a hill and now it won't start cause of heat soak. That is when you're really going to regret not spending that 50 dollars lol..
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03-10-2021, 05:11 AM
#15
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Year: 1996
Model: Cherokee (XJ)
Engine: 4.0
Ok, just a final follow up to this thread. I installed the heat shield, while I was at it I also installed a flux capacitor, and Mr.Fusion energy converter as well as a Ronco Hot Dog cooker and bun holder in the cargo area. Best part is they all the parts were on sale at 99% off during the tax free period. You just never know what could happen once we crack Mars open...just Imagine the thousands of gender neutral Martians wanting to come to Earth and take all of our women folk. A bit of time travel and a hot meal will be worth more than Bitcoin. So with that being said...ummm...something about future or going back...blah blah blah....
have a nice day now...
have a nice day now...
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doublechaz (03-10-2021)