Want to upgrade to a 3MZ? by Smaay

3 minute(s) of a 9 minute read

most of you probably dont know but my 1MZ/3MZ hybrid engine started knocking. which sucks because i built this engine fresh. anyways i had a full 3MZ on the shelf as a backup so i swapped it out.

here are the few issues I ran into.

you need to use the 1MZ water neck because it has the sensor for water temp to your gauges



you will notice i modified my rails to be a return system. you dont have to do this. just use the pink injectors that come with your swap engine.

you have to remove the newer style knock sensors and use your older style. here are the studs from the new sensors. take them out and then put in your older style sensors.





ok first big issues is this water port that sends water to the throttle body. it hits the OCV for VVT in the rear head. since im not using those, i just pulled out the tubes and tapped the hole and plugged it.







Here is the lower manifold attached to the 3MZ



i also had to remove the water nipples on the bottom of the throttle body. again im not using the water ports so no problem. I just put a cap on the rear port for the water return. if i ever have to pull this engine out, ill tap that hole too and plug it. I tapped them with 1/8 NPT so if you must have them you can easily find brass fittings much smaller and just make your own water ports.

the 3MZ has cam position sensors on both heads, im only using the one on the front head. I didnt have to make any changes to the harness.

you will have to do something about the EGR tube. there is no EGR on the 3MZ so no cooler. I just fabbed up the tube as one long single pipe.

this is what you will get as results hooked up the the 5 speed E153 trans



this is all i can think of right now. if this is old news then sorry for double posting. I have seen 3MZ engines on car-part.com for less than 1000 bucks. not a bad mod for 1G and have 241 TQ huh?