What is a Renix

[RLCollins]

what is a Renix?

What is my truck, which is a 1989 MJ longbed 4X4 with a 4.0 MPI I-6. I only have one fuel line going to the fuel rail. What kind of ECU would I have?

What is the differene between and MPI, and a TBI?

Which one performs better?

I always have lots of question

Thanks for the help :chillin:

[ComancheKid45]

Renix is the name of the computer system used in our Trucks as well as many jeeps from 1987-1990. Your truck is run off a Renix type system. MPI and TBI stand for the way the fuel is injected in the engine. (Multi Port Injection/Throttle body Injected) The 4.0 uses MPI and sinces its an inline engine there is only 1 fuel rail to supply the injectors :thumbsup:

 

Youll easly find any info you need about your truck around here, grab a beer (or Mountain Dew) from the fridge and enjoy your stay :cheers: :thumbsup:

[Eagle]

what is a Renix?

Already asked (by you) and answered in another of your threads:

 

I am a little behind, could someone explain Renix to me. How can I tell which system is in my 1989 MJ 4.0 MPI I-6? :dunno:

 

American Motors owned Jeep when the XJ (and MJ) was designed. Renault was a major partner of AMC. The design of the ignition and injection system was a joint venture of Renault and Bendix of Europe. RENault + bendIX = RENIX. The Renix system was used on the 4.0L engine from 1987 through 1990, and on the 4-cylinder engine from 1986 through 1990.

 

What is my truck, which is a 1989 MJ longbed 4X4 with a 4.0 MPI I-6. I only have one fuel line going to the fuel rail. What kind of ECU would I have?

You have a Renix

 

What is the differene between and MPI, and a TBI?

MPI, or MPFI, is "multi-port" fuel injection. TBI is "throttle body" fuel injection.

 

Which one performs better?

MPFI

[RLCollins]

Thanks comanche kid45 for the information it is helpful

Sorry Eagle - I don't remember reading the response to the thread

Thank you for reminding me, by by cutting and pasting them together. :yes:

:doh:

[Automan2164]

To further expand on the MPI/TBI:

 

Multi Port Fuel injection uses ONE INJECTOR per CYLINDER. IE, a 6 cyl, will have 6 injectors on a MPFI car.

 

Throttle Body injection is just that. One injector, located in the throttle body.

 

Rob L. :D

[Oizarod115]

and you SHOULD have 2 fuel lines, i suspect you're overlooking the other one.v

[RLCollins]

Your right Oizarod115. What I met by one fuel line, is there is one up front instead of two, and there is one is the back. :chillin: