I have a '91 v6 montero and have found a faulty fuel injector that I need to replace. My question: Does anyone know if fuel injectors from a different Mitsu 181 ci v6 motor will work. I have some extra fuel injectors that came from the same type of Mitsu v6 engine but from a different model vehicle but am not sure which vehicle they came from. It was a tranverse mounted engine. Could I reasonably expect these fuel injectors to spray a different amount of fuel?

Jeff

they are both the 6G72 engine

The other injectors used on , Diamante, Sonata , etc. will work but you can't mix them as they are slightly different hieghts and your rail won't mount and seal good ,,,very risky...

?????????????????? got any pictures ???? i dont belive you

I'm too primative for pictures...

Even on the switch from the 89 to 90 3.0 , the 1st ones call NIKK ( I don't have the 3s with me) that were superceded dy ones with Denso writtin on them , the "sheet" spacer grommet is of different hieght and originally ( before recent superced) the o rings were different # , slight differnce in diameter of cross section of o ring

I ran 5 used Sonata and 1 new Denso for a couple years.
I had to get an assortment off sheets , and o-rings to make it work. the rail will sit a little lopsided if you put the denso at one of the corners it's more obvious.
I've seen too many vehicles in the yards dead from o ring failure fires.
If you change them change all six to the same inj.
It aint worth the risk if you like your vehcle. Also did you try getting bad injector ultrasound seviced. I never had a Denso injector fail electricly.

Ok, Here's my final determination with ya'lls help. Both of the injectors I have are the same size/length. In fact, the O-rings are the same size. As far as them being of the same manufacture, I'm not sure. One is labeled Denso while the other only has numbers and letters (N210H and LNP-057). The reason for the faulty injector: While I was in the process of installing all new seals I dropped one of them and didn't realize that the small needle broke. I found this out after starting the vehicle and had what sounded like a miss-fire, and then pulling all the injectors again. After ensuring same size and seal fitment I used the extra injector and viola! It works! The one question remains: Would any of you know if this injector is delivering the same amount of fuel as the origianls? I would assume so since they all came from a 6G72 motor but from a different vehicle and generally horsepower/torque come from the grind on the cam, not so much from the amount of fuel delivery

What you've identified as an "LNP-057" is actually an "INP-057". It's made by Nippon-Denso and is the same as the "N210H".

The N210H is used in the SOHC 10:1 compression ratio engines (Diamante), while the B210H (also designated INP-051) is used in the SOHC 8.9:1 compression ratio engines as found in Monteros.... and yes, the N210H and INP-057 injectors will run rich in a Montero engine.

Here are the injectors you should be able to use in a Montero SOHC 8.9:1 compression ratio Mitsubishi 3.0L V6 engine:

89-94 Montero 3.0L V6
97 Montero Sport 3.0L V6
89-90 Sigma V6
90 Pickup V6 (some - not all - to 5/90)
91-92 Mirage 1595cc 4 cyl
88 Galant V6 (some cars - not all)
89 Galant 1997cc 4 cyl (some cars - not all)
90 Eclipse 1755cc 4 cyl (some - not all - to 5/90)

Frank

Thanks Frank <img src="/forums/images/graemlins/kewl.gif" alt="" />! So, as it turns out, the original motor??? had the wrong injectors installed. It had a blown motor when I bought it and there was also evidence that someone had made an attempt at a rebuild. Last question ( and I promise this thread will end after this one <img src="/forums/images/graemlins/kewl.gif" alt="" />) what are the downsides to running rich? (I won't be able to change these till sometime this weekend)

If you have a matched set of N210H injectors and a good o2 sensor, the ECU may be able to adjust the fuel trim in closed loop - or it may not be able to do it - I don't know. But - there's nothing it can do when the engine is cold, so you'll be seeing extra fuel in the cylinders. The downside is oil dilution, engine wear and maybe catalytic converter damage.... not to mention poor fuel mileage.

The problem with using a mis-matched set of injectors is an unbalanced fuel supply being read by only one o2 sensor. With a mis-match, even if the o2 sensor adjusts the overall mixture to average a correct overall average mixture, some cylinders will be lean and others will be rich.... a prescription for a blown engine due to oil dilution in the rich ones and detonation in the lean ones.

Whatever injectors you use, I'd recommend a set of the same identification numbers. My preference for the Montero 3.0L SOHC would be the B210H/INP-051.

Are you sure you have a Montero engine in the truck? It's possible someone could have swapped in a Diamante SOHC 10:1 CR block.

Frank

The blown moter that came with the truck had the N210H injectors. (Was it a Motero engine? I'm not sure.) I then ordered a 6G72 used <img src="/forums/images/graemlins/scared.gif" alt="" /> motor that came with the B210H injectors which are the correct injectors. Well, that motor didn't work out either <img src="/forums/images/graemlins/scared.gif" alt="" /> (oil pump! <img src="/forums/images/graemlins/scared.gif" alt="" />) so I purchased a rebuilt/reman block and heads. When I purchased this motor I specifically stated what the application was for ('91 Montero LS 3.0L v6, 6G72). I do suspect though that the compression on this rebuilt is higher than stock. My reasoning is that I purchased the block and heads separately and ended up with the intake manifold not seating properly due to apparent milling of the heads and block. I got that problem solved with machine work. So, I guess whether or not I have a true lower compression montero engine is unknown. To play it safe, I'm going to go back to the B210H injectors.
Thanks Frank!
Thanks all of ya!