RLCollins Posted December 13, 2009 Share Posted December 13, 2009 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: Link to comment Share on other sites More sharing options...
ComancheKid45 Posted December 13, 2009 Share Posted December 13, 2009 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: Link to comment Share on other sites More sharing options...
Eagle Posted December 13, 2009 Share Posted December 13, 2009 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 Link to comment Share on other sites More sharing options...
RLCollins Posted December 13, 2009 Author Share Posted December 13, 2009 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: Link to comment Share on other sites More sharing options...
Automan2164 Posted December 13, 2009 Share Posted December 13, 2009 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 Link to comment Share on other sites More sharing options...
Oizarod115 Posted December 14, 2009 Share Posted December 14, 2009 and you SHOULD have 2 fuel lines, i suspect you're overlooking the other one.v Link to comment Share on other sites More sharing options...
RLCollins Posted December 16, 2009 Author Share Posted December 16, 2009 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: Link to comment Share on other sites More sharing options...
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