playin4funami

would it be to swap my 90 throttle body engine (4.0) to fuel injected(I have a complete 92 jeep with all the fuel injection stuff with a broke crank. Is it possible to do this and will it all bolt up? I assume I would also need to change the fuel pump and fuel lines and will I need to bring the computer over too? the throttle body runs okay now I just don't like the hesitation on it when I press the skinny pedal. Is it worth it?

J-leblanc

I may be wrong and probably am, but I swear someone said all you need is the fuel rail, pressure regulator and the injectors. But let's see what others say. I'm curious as well, having a 88.

odgreen

alright ill be the guy to say this. everything you said makes no sense.
your 90 xj is fuel injected and so is your 92... what are you asking about?
im just very confused by your question

playin4funami

the 90 has a throttle body the 92 is direct injection, the 90 has a nasty hesitation now and then compared to the 92 direct injection. I don't know all the correct terms to use but I am trying.the 90 does not have the orignal engine in it, I did not do the replacement but it has a reman engine with 50,000 on it, it is strong, but think it would benefit from the direct injection

odgreen

ok here is where im confused.
only 2.5l came with throttle body injection according to jeeps website and i have never seen a 4.0 with tbi... anyone correct me if im wrong.
some pics would be nice if it is a 4.0 with tbi

playin4funami

yes it is the 4.o 242ci l6 with a throttle body(tbi) 1990 model jeep cherokee. I don't have any pics it is dark out and cold too, I will attempt to get a picture to you soon. but it may be late tommorrow or even monday as tommorrow is going to be busy for me.

captainwoot

If your 1990 is an xj it will be injected the same way as the 92 , the difference is the 90 is a renix system and the 92 is a chrysler controlled sys. Use the intake and sensors on the vehicle that you are installing it into .

AMXJ

I'm with you, confused! They both (90 & 92) have throttle bodies to control air flow, but they are both port fuel injected. At least the ones I have owned, worked on, or seen. I really want to see these pictures.

huntingman2706217

direct injection? direct injection is how the new Ford V6 motor is getting crazy good gas mileage with crazy good power... direct injection is the cummins 5.9... direct injection means the injector injects right down onto the cylinder head and there is no throttle body or anything... found on boats as well... but not perfected in a gas motor till ford built theres... from 86-01 they all had throttle bodies on the I6... just two different style...

now to answer you question is it possible? yes... it is possible... BUT you gonna need to swap the entire wire harness... computer... the head off of the 92 along with everything attached to your harness... its a big job... and its not worth it... better off buying 91+ or fixing what evers wrong with the 92 with parts from the 90... or fixing your 90 renix.... if its sluggish then theres a reason... not because of the model of throttle body... i had no problems with my 89 and it being sluggish or studder or anything... drives just like my 95...

djb383

No throttle body????????? I thought all motors had a throttle body.....isn't that what the accelerator pedal connects to, to control the amount of air the motor draws? Carburetors have a throttle body as well as fuel injection systems. Some FI systems have the injector(s) mounted in the throttle body assembly (TBI). Some systems have the injector(s) mounted in points/ports close to the end of the intake manifold, just ahead of the intake valve (MPI). Some systems have the injector(s) mounted directly in the cylinder head (DI). Direct injection is common to diesels, has been forever. Gasoline direct injection goes back to the mid 1920s.

huntingman2706217

negative... all engines do not have a throttle body... a carb is completely different then a throttle body lol... a carb has the injectors and air intake mixed in one... a throttle body has injectors separate from the air intake and only regulates the air intake... although sensors on it regulate the amount of fuel to disperse to the cylinders per ambient temperatures and volume of air being sucked through... direct injection is different then both... think of the cummins it has injectors that are bolted inside the head... the fuel is adjusted by the CP3 (injector pump) and set with the timing of the engine to push fuel at a specific time to the injector which does really nothing more then correct spray patterns for prime atomization. Im almost positive direct injection was never used in the 20's... if the technology was there for it then then we would never be just now getting to it now... cars from back in the day were all carberated as for as i know and throttle bodies didnt kick off until the 80's and maybe late 70's...

djb383

LOL, no throttle body.....what does the gas pedal connect to?....other than the throttle body. Google direct injection.....u won't find Ford Ecoboost dating back to 1925. LOL

huntingman2706217

Gas pedal connects to a throttle cable... the other end of the throttle cable connects to the Carb linkage to be exact or the Carb... connects to a throttle body or linkage too... or connects to sensors reading the amount of throttle to the computer like on a Cummins...

I can't believe you think all vehicles have a throttle body... what school did u go to? Lol... u should Google... throttle body... read wiki's definition... this is so awesome... lol...

huntingman2706217

Oh and your the one that said direct injection went back to the 1920's... I said it did not... so I dunno what the crap your talking about... lol... are u drunk or something?

djb383

So, u don't know anything GDI.........but u know I'm a drunk...........that's really big of u, I appreciate that.

Gasoline Direct Injection
http://en.wikipedia.org/wiki/Gasoline_direct_injection

Carburetor throttle body/plate
http://www.google.com/imgres?imgurl=...w=1259&bih=576

Throttle body fuel injection (injectors in the throttle body)
http://www.google.com/imgres?imgurl=...1t:429,r:0,s:0