Neon injector upgrade
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Seasoned Member
Joined: Dec 2011
Posts: 319
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From: Wenatchee, WA
Year: 1990
Model: Cherokee
Engine: 4.0L Renix
I pulled the rail and cleaned my stock injectors thoroughly a few months ago and, at the same time, epoxied (chem-resistant) the body of the injector where it was leaking which I knew wasn't a permanent solution but it worked long enough for me to take care of more pressing issues. The leak is substantial enough that I can see gas bubbling around the seam where plastic meets metal, I can also see an area on the heat shield where gas has pooled. In California, we also have to pass a visual inspection and if raw gasoline is present in the engine bay they will not pass it.
When I discovered that it was leaking again (while repairing a fried spark plug wire) I decided it was time to upgrade and spent Monday and Tuesday scavenging my local junkyards for 703 injectors. I'll wait to hear back from ShootingSticks as to whether or not replacing the vacuum line to his MAP remedied the rich condition he was experiencing before I start wracking my brain for alternate solutions. I could probably install the 703s and deal with the rich mixture and swap the stock injectors back in for smog but if the 703s foul my catalytic converters then I don't see how I've gained anything.
When I discovered that it was leaking again (while repairing a fried spark plug wire) I decided it was time to upgrade and spent Monday and Tuesday scavenging my local junkyards for 703 injectors. I'll wait to hear back from ShootingSticks as to whether or not replacing the vacuum line to his MAP remedied the rich condition he was experiencing before I start wracking my brain for alternate solutions. I could probably install the 703s and deal with the rich mixture and swap the stock injectors back in for smog but if the 703s foul my catalytic converters then I don't see how I've gained anything.
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Yea, both down in Sonoma County and up here by the boarder, only on the transfer. Population density thing I guess. I am curious about how it goes with the 703's, when do you need to have it done? (inspection). If I find my 02 sensor is crap, you can maybe feel better about going in with the 703's.
CF Veteran
Joined: Nov 2011
Posts: 2,381
Likes: 6
From: SoCal
Year: 1989
Model: Cherokee
Engine: 4.0
My smog won't be up until November of 2013 but I've got a buddy who runs a smog shop and may take it in for a quick run on the treadmill before and after I swap out the injectors.
Seasoned Member
Joined: Aug 2009
Posts: 300
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Year: 88 limited
Model: Cherokee
Engine: 4.0
I live right in the middle of California and need to smog every two years.8 months ago I put 703s right in the middle of tring to pass smog my 88 passed without any problems,and that is with having to have it dyno tested
CF Veteran
Joined: Nov 2011
Posts: 2,381
Likes: 6
From: SoCal
Year: 1989
Model: Cherokee
Engine: 4.0
Thanks je4reyk, that's good to know and gives me confidence for Nov. 2013. I swapped in the 703s today, ran into a little problem with the return line seal which wasn't holding pressure. Discovered that someone had stuffed a few black o-rings in there. Got the correct seals and she fired on the first try, settled into a silky smooth 600 RPM idle and definitely has more oomph than she did before.
I was going to run a smog on it (just for fun) but my buddy's shop was closed today so I guess I'll just have to keep my fingers crossed and hope my results are the same as je4reyk. It doesn't smell like it's running rich at all, in fact, it doesn't smell which is an improvement, I've had it for about 6 months now and it's always smelled like gas at the exhaust.
I was going to run a smog on it (just for fun) but my buddy's shop was closed today so I guess I'll just have to keep my fingers crossed and hope my results are the same as je4reyk. It doesn't smell like it's running rich at all, in fact, it doesn't smell which is an improvement, I've had it for about 6 months now and it's always smelled like gas at the exhaust.
CF Veteran
Joined: Nov 2011
Posts: 2,381
Likes: 6
From: SoCal
Year: 1989
Model: Cherokee
Engine: 4.0
Unfortunately, whoever worked on this Jeep in the past (probably the shop that replaced the injector seals last year) just used regular butyl (black) rubber o-rings which don't do well in the presence of gasoline. Thankfully, they didn't leak before I discovered it but they were a gooey mess in there.
CF Veteran
Joined: Nov 2011
Posts: 2,381
Likes: 6
From: SoCal
Year: 1989
Model: Cherokee
Engine: 4.0
You will need 784s for your '01 (not 703s). From what I've read, the injectors are the same but have different connectors... Old EV1 style for the 703s and newer EV6 for the 784s.
Member
Joined: Mar 2011
Posts: 155
Likes: 0
Model: Cherokee
Just finished up. About to go for a drive to let it relearn after the reset. I'm attaching a pic to show what I found on #2. It was dry in the engine input as well.
#2 is on top. The other 5 looked just like the lower one. It's obviously a different injector & the tip was smooshed down.
#2 is on top. The other 5 looked just like the lower one. It's obviously a different injector & the tip was smooshed down.
CF Veteran
Joined: Apr 2011
Posts: 14,553
Likes: 1
From: Carrollton, GA
Year: 1994
Model: Cherokee
Engine: Inline 6 4.0L High Output
Just finished up. About to go for a drive to let it relearn after the reset. I'm attaching a pic to show what I found on #2. It was dry in the engine input as well.
#2 is on top. The other 5 looked just like the lower one. It's obviously a different injector & the tip was smooshed down.
#2 is on top. The other 5 looked just like the lower one. It's obviously a different injector & the tip was smooshed down.
Member
Joined: Mar 2011
Posts: 155
Likes: 0
Model: Cherokee
It was so clean & dry that it looked like it wasn't even firing. There should be something there, at least from before it gets hot everyday.
The smooshed tip could've been from heat, but the injector port wasn't blocked.
The smooshed tip could've been from heat, but the injector port wasn't blocked.
Last edited by judbgrdmchn; Feb 10, 2013 at 12:01 PM.
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