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  #16  
Old June 14th, 2019, 10:06
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

So I tested the injectors, all are reading around 12.5 ohms "cold", and 14.0 ohms "hot". Seems normal..
I guess I'll see if swapping the two new ones in helps. If not, I guess it will be time to buy a new set from a reputable seller..
Thanks!
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  #17  
Old June 14th, 2019, 21:55
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Tested the resistance on the injectors. Sitting around 12.5 ohms “cold” and 14.0 ohms “hot”, seems normal.
Now, it seems to be happening more frequently. And get this, the last couple times, it’s thrown codes for misfire on all 6 cylinders! P0206 for circuit failure on injector 6, plus P0301-0306 for misfires on every cylinder.
I was praying to the Jeep gods that it was air in the fuel lines since I never bled the fuel rail after the install but I bled the rail and no change..
I’m stumped
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  #18  
Old June 14th, 2019, 22:36
trippled trippled is offline
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Re: Misfire after injector upgrade

Focus on cylinder 6 and go from there.
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  #19  
Old June 18th, 2019, 07:58
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Thought I would share my solution for anyone with a similar issue. I swapped in the 2 replacement injectors the seller sent me, and right away had a check engine code for injector #4. After wiggling the connectors, the misfire went away (hadn’t observed this before).

I’ve determined the intermittent issue is due to a tolerance stack up of the loose China special adapters, and 24yr old stock connectors. In the long term, I’ll be purchasing some higher quality adapter pigtails.
In the short term, zip ties around the connectors to keep them from moving around seems to be doing the trick!
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  #20  
Old June 18th, 2019, 11:05
Cummins90 Cummins90 is offline
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Re: Misfire after injector upgrade

Can I ask why you didnt buy ev1 style injectors?
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  #21  
Old June 18th, 2019, 15:39
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by Cummins90 View Post
Can I ask why you didnt buy ev1 style injectors?
Really just because the ev6 seems to be the majority of what’s out there. From what I can tell, the Bosch 703’s from the dodge neon which were the “go-to” part number for this upgrade are few and far between these days. I had a hard time finding them.
Or maybe I just didn’t look hard enough lol I wouldn’t put it past me.
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  #22  
Old June 18th, 2019, 20:03
lawsoncl lawsoncl is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by Quailman View Post
Really just because the ev6 seems to be the majority of what’s out there. From what I can tell, the Bosch 703’s from the dodge neon which were the “go-to” part number for this upgrade are few and far between these days. I had a hard time finding them.
Or maybe I just didn’t look hard enough lol I wouldn’t put it past me.

For future reference jhc7399, over on cherokeeforum.com sells refurbished 703s and 746s. He replaces o-rings, cleans and flow tests them. Avoid the chinese knock-offs on eBay as way too many people have reported issues.
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  #23  
Old June 18th, 2019, 20:15
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by lawsoncl View Post
For future reference jhc7399, over on cherokeeforum.com sells refurbished 703s and 746s. He replaces o-rings, cleans and flow tests them. Avoid the chinese knock-offs on eBay as way too many people have reported issues.
I’ll keep that in mind, thanks! I bought the headlight harness upgrade from him a while back, didn’t realize he did injectors too.
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  #24  
Old June 20th, 2019, 08:28
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Jeff-97XJ Jeff-97XJ is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by lawsoncl View Post
For future reference jhc7399, over on cherokeeforum.com sells refurbished 703s and 746s. He replaces o-rings, cleans and flow tests them. Avoid the chinese knock-offs on eBay as way too many people have reported issues.
I have a 1997 XJ, 4.0, 231J, 500K miles.
Original engine, but I think I would probably get better mileage and performance if I put in new injectors to replace the originals that are in this engine with 500K miles on it.

Is a refurbished injector, as in the quoted info above, the way to go?
If so, which injector is the proper one for a 1997 4.0?
If there is a better choice, please advise-

Thanks,
Jeff-97XJ
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  #25  
Old June 20th, 2019, 08:35
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by Jeff-97XJ View Post
I have a 1997 XJ, 4.0, 231J, 500K miles.
Original engine, but I think I would probably get better mileage and performance if I put in new injectors to replace the originals that are in this engine with 500K miles on it.

Is a refurbished injector, as in the quoted info above, the way to go?
If so, which injector is the proper one for a 1997 4.0?
If there is a better choice, please advise-

Thanks,
Jeff-97XJ
If I had to do it all over again, I would spend the extra money and get them from ksuspensionfab.com
Seems like the best way to go to ensure you’re not receiving junk.
They offer new or refurbs (refurbs are probably perfectly fine), and you just enter your year range, they’ll send you the right ones.
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  #26  
Old June 20th, 2019, 08:38
RCP Phx RCP Phx is offline
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Re: Misfire after injector upgrade

There has been more complaints than good reviews on Kfab.
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  #27  
Old June 20th, 2019, 08:43
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Jeff-97XJ Jeff-97XJ is offline
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Re: Misfire after injector upgrade

Thank you for these replies.

Would love to just buy the right ones once and never have to deal with this again!
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  #28  
Old June 20th, 2019, 08:53
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Quailman Quailman is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by RCP Phx View Post
There has been more complaints than good reviews on Kfab.
Damn really? That’s disappointing I thought they had good ones lol
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  #29  
Old June 20th, 2019, 08:57
Ralph77 Ralph77 is offline
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Re: Misfire after injector upgrade

Quote:
Originally Posted by Jeff-97XJ View Post
Thank you for these replies.

Would love to just buy the right ones once and never have to deal with this again!
I don't often admit this. It is a little embarrassing.
But I paid $300 for my 4 hole injectors.
But in my defense there was some logic behind this.
One of the customers at the auto parts store I work at is pretty much the go to place for engine rebuilding in the area. The owner is one of those guys that when he talks you listen.
The son of the owner owns an '00 XJ like me.
He upgraded to 4 hole injectors from here:

https://www.injector.com/cart/pc/home.asp

Now these are brand new injectors.
Also this place is literally 15 minutes from my house.
So I figured if there was problem, which in about 5 years there has not been, it would be easier to deal with.
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