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Unread 01-09-2012, 09:24 AM   #1
Dafish
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4.0 Fuel injectors

I have a 1992 Comanchee with 4.0, a guy mentioned I could get better performance and gas mileage if I changed the OEM injectors with Bosch injectors, He said they have 4 port small port holes instead of one big one. Has anybody installed these and if so what is your opinion? Thanks

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Unread 01-09-2012, 04:49 PM   #2
Programbo
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Originally Posted by Dafish View Post
I have a 1992 Comanchee with 4.0, a guy mentioned I could get better performance and gas mileage if I changed the OEM injectors with Bosch injectors, He said they have 4 port small port holes instead of one big one. Has anybody installed these and if so what is your opinion? Thanks
Hello. Yes going from the single port stock injectors to the 4-port ones is one of the most common upgrades that can be done to a Jeep. Generally people use the Bosch 703 "Neon" injectors as they are the same flow rate as the stock Jeep ones and are a direct swap out. The main advantages are you get a smoother idle, quicker starts and a better throttle response and acceleration because of the better fuel atomization.
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Unread 01-10-2012, 05:50 AM   #3
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Originally Posted by Programbo View Post
Hello. Yes going from the single port stock injectors to the 4-port ones is one of the most common upgrades that can be done to a Jeep. Generally people use the Bosch 703 "Neon" injectors as they are the same flow rate as the stock Jeep ones and are a direct swap out. The main advantages are you get a smoother idle, quicker starts and a better throttle response and acceleration because of the better fuel atomization.
Another real big advantage is the new injecotrs don't split at a crimp like the originals and spray raw gas on your exhaust manifold.

This guy also has an ebay store and the prices are for a set of 6 injectors:

http://www.precisionautoinjectors.co...7&categoryId=3
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Unread 01-10-2012, 07:02 AM   #4
Programbo
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This guy also has an ebay store and the prices are for a set of 6 injectors:
http://www.precisionautoinjectors.co...7&categoryId=3
Hmmm. I'm not sure what injector he is showing there in those photos. They arent any of the most common "upgrade" Jeep injectors I think they are just rebuilt and tested stock injectors.
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Unread 01-10-2012, 07:10 AM   #5
cruiser54
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The ones I got were Ford Yellow-top and Orange-top, 4 hole units. I've installed his injectors on 3 Renix Jeeps now.

They are rebuilt, flow-matched and come with new o-rings. The upgrade is that they're 4 hole instead of single hole.
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Unread 01-10-2012, 05:58 PM   #6
Programbo
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The ones I got were Ford Yellow-top and Orange-top, 4 hole units. I've installed his injectors on 3 Renix Jeeps now.
They are rebuilt, flow-matched and come with new o-rings. The upgrade is that they're 4 hole instead of single hole.
Sounds about right. But I think that photo is showing just basic single port Chrysler injectors.
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Unread 01-10-2012, 06:06 PM   #7
cruiser54
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Could be a generic photo.
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Unread 01-10-2012, 08:16 PM   #8
Dafish
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So, do you get better gas mileage with them also?
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Unread 01-10-2012, 09:03 PM   #9
cruiser54
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Didn't really notice. We both do mostly around town driving. Idle quality and throttle response were both improved. And the fact that the new style injectors don't cause Car-B-Ques like the originals is a bonus.
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Unread 01-13-2012, 05:44 PM   #10
Programbo
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So, do you get better gas mileage with them also?
Some people see an increase in mpg but that's usually because they are swapping out very dirty poorly performing injectors for new ones. If your stock injectors arent overly dirty your mpg won't change much.
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Unread 01-13-2012, 05:51 PM   #11
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Some people see an increase in mpg but that's usually because they are swapping out very dirty poorly performing injectors for new ones. If your stock injectors arent overly dirty your mpg won't change much.
I agree. And, the stock Renix injectors are a fire waiting to happen.
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Unread 01-19-2012, 01:32 PM   #12
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Why are they a fire waiting to happen...?
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Get in sit down and shut the F#%* up!
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Unread 01-19-2012, 03:29 PM   #13
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Why are they a fire waiting to happen...?
The original injectors on the Renix Jeeps were made by Siemens-Deka. They had a crimp on the body of the injector which in time could spring a leak spraying raw gasoline on to the exhaust manifold.

The upgrade injectors are Bosch and have no crimp.
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Unread 01-19-2012, 06:00 PM   #14
Programbo
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The original injectors on the Renix Jeeps were made by Siemens-Deka. They had a crimp on the body of the injector which in time could spring a leak spraying raw gasoline on to the exhaust manifold.
But to be fair that rarely happens. Yes it CAN happen because of the injector design but it's not a common event so I wouldn't lose sleep over it.
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Unread 01-19-2012, 06:32 PM   #15
cruiser54
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Only needs to happen once. And besides, the upgraded injecotrs and new seals are about due at this point anyway.
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