injector #3 - Jeep Cherokee Forum
Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Log In 

injector #3

Thread Tools Search this Thread
Old 03-20-2009, 09:29 AM   #1
Join Date: Mar 2009
Posts: 20

View jerry's Photo Album My Photos
Default injector #3

Had my 01 that I just purchased start misfiring on me the other day and posted a question about it. After trying to figure it out myself I finally just took in in to the dealer. They flushed my injectors for me and told me it was fine the first day because it wouldnt misfire for them. I told them it had to sit running for a while and get hot but they didnt believe me. Before I got it home in 5 o'clock traffic it did it again. I turned it around and brought it back. They just called me and said they moved the #3 to #2 position and the computer gave a misfire #2 code. Same when they moved it to #1 spot. So its definately a bad #3 injector. Heres my question- why do so many #3 injectors that I read about on this forum go out? Is it a bad design of the intake where they sit(picking up too much heat ?) And if it is it seems to me shielding it with a plug boot would make the heat prob. worse since it is likely not radiant heat otherwise all the inj. would misfire. Can anyone shed some light ?
jerry is offline   Reply With Quote
Join Cherokee Forum

Join Today - It's Totally Free!

Do you love your Jeep? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Jeep Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your jeep, and have a great time with other Jeep Cherokee fans.. Whether your an old timer or just bought your Jeep you'll find that is a great community to join. Best of all it's totally free!

Join Today! - Click Here JOIN FOR FREE

Old 03-20-2009, 09:48 AM   #2
Seasoned Member
funkle95xj's Avatar
Join Date: Dec 2008
Posts: 495

View funkle95xj's Photo Album My Photos
1995 Cherokee

The 4.0, especially in the xj, is well known for this. It is caused by the #3 injector being located extremely close to one of the exhaust manifold pipes. In this area, it is exposed to alot of heat soak. This can lead to the fuel inside the injector vaporizing, leading to a misfire condition due to a temporary lack of liquid fuel flow. Obviously being exposed to higher than normal heat can lead to premature failure of the injector as well. I'm sure having to deal with this vaporized fuel condition isn't exactly easy on the injector either.. A good way to counter this and prevent it from happening is to get some of that quality heatsheild tape (available at most auto parts stores) and wrap each injector with it, like a mini heat shield. This can help lower the temperature enough to stop, or at least minimize this condition.
DaFunk-95 Cherokee Sport 4.0/AW4/2WD/8.25
5" lift mostly RC stuff
CA Drop Brackets
31" Kumho AT's
All the usual go faster parts (still doesn't go much faster)
And a bunch of other stuff...

What does it all add up to? A bunch of wasted time and money. A bunch of time and money I wouldn't take back even if I could!
funkle95xj is offline   Reply With Quote
Old 03-20-2009, 12:27 PM   #3
Join Date: Mar 2009
Posts: 20

View jerry's Photo Album My Photos

thanks my friend, I'll try it !
jerry is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
1995 Cherokee Trouble Codes???? sluger17 OEM Cherokee Tech 3 06-20-2016 02:37 PM
[FS] Chrysler Injectors JPXJMOAB Engines/Tranny/T-Case 7 11-02-2015 11:51 AM
Is this injector still usable? yorkee Modified Cherokee Tech 8 10-03-2015 04:41 PM
JK 3.8L Supercharger Kit '07-'11 CobraMarty Modified Cherokee Tech 0 10-01-2015 08:34 AM
Fuel consumption change after injector swap 4WD4EVER Modified Cherokee Tech 25 09-29-2015 12:46 PM

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 04:25 PM.

This site is in no way affiliated with Jeep or Chrysler.