Engine swap question

Will the 3.4 bolt up to my 2.7 5 speed manual tranny? My 2.7 still has a crazy bad misfire so I’m thinking of swapping it with a 3.4

 

No it won’t unfortunately. You can possibly see if marlin crawler makes a bell housing adapter that would enable you to use the 2.7 trans with a 3.4

 

gotcha. So I’d need the engine, trans, transfer case, 3.4 front driveline, 3.4 rear driveline, wire harness, ECU. Im sure there’s more I’ll need.

 

Its as much work if not more than a 1uz, 2jz or LS1 swap, and the gain is what 40hp?, and the 1uz weighs less than the 3.4 v6 and only 30lbs heavier than the 2.7 with 100 more hp than the 2.7.
Food for thought.
R/

 

yeah I get it. I’m not worried about hp. I’ve been driving my 2.7 with a misfire for over a year. Has no power but it’s my daily and I have no money to buy something else so I keep driving it. Has yet to let me down. Maybe I’ll look into the 1uz instead then. Which ever one is easier.

 

Keep us posted! Love the idea. Also didnt know that a 1uz weighs less than the 5vz.
I remember reading a thread about a fellow who put a v8 1st gen tundra drivetrain in a single cab taco frame with a 1st gen 4runner body. If i find the link ill post it. Wicked project.

The time for an engine swap will come for me, been considering a tdi. Its a ways away yet.

 

Well there is 3 classes of UZ,s 1uz 2uz and 3uz the 1uz is 4.0 ltr and all aluminum, the 2uz 4.7 ltr is iron block with aluminum heads, the 3uz 4.3 ltr all aluminum. I think the post your talking about was the 2uz used in the Tundra and some 4runners and sequoias. I could go on and on about the differences but no need to bore you with that.
My 1uz swap has been done since late summer of 2022 and has been working very well (knock on wood) i have been procrastinating on doing a swap build page because im not sure how to go about it this is the only forum i have joined so not to savvy in that aspect, i use my wifes fb to navigate other sites and get info. Yesterday i drove from north Tampa to West Palm Beach (227 miles) got 18 mpg averaging 75-80 mph, single cab, 4:56 gr, 255/85R16 tire, 2 1/2 lift, tach 2500 rpm, non ethanol gas, speedo is accurate double checked by gps. I think these trucks should have been built with these engins.

 

2.7L is the ideal platform for a turbo

 

Despite having owned a v8 1st gen tundra, i didnt realize the 2uz was the only iron block in the family. Good to know!

Would love to see a build thread on that. Having seen several 1uz swapped things (nightride's na miata and a ae86) id LOVE to see it in a first gen. Power to weight babey

And @Op sorry for the threadjack. Have you chased the misfire cause at all? Several trucks ago i had a 2.7 1st gen and never had spark issues. Coil packs, plugs, and fuel system (esp that stupidly placed filter) all in normal operating condition?

 

I have tried and chased it. Took it to Toyota for a leak down test sometime last year, can’t remember exactly when, and they said it was leaking out of the exhaust and then I took it to a family friend mechanic a couple weeks ago and he said it was leaking out of the intake somewhere. I have a strong feeling it’s valves but I don’t want to replace the head then have something go wrong with the bottom end so I’m gonna just drive it till she gives up and swap it with another 2.7 if I can find one cheap or do a 5.3 Chevy/gmc swap. Still have to figure out which engine is going to be the lightest so I don’t have to upgrade suspension too much.

 

Im far from a professional mechanic but its hard for me to conceive how a vacuum or exhaust leak would cause a misfire. Feel free to tear me apart on how im wrong lol

While i know its a bit more involved for the 3rz, i used a compression tester as a leakdown on a buddys 99 civic to see if he bent any valves when the timing belt broke. Youd have to pull the intake, or most of it anyway, and could use that as an excuse to reseal any leaks in the bastard. Provided you dont have bent valves.

Why am i arguing against a sbc swap? Hope when you go for it you start a build thread!

 

I did a compression test a year ago and I had 60 psi in cylinder 3. Toyota did a compression test earlier this year and they said they got 40 psi in cylinder 3. So slowly but surely something is happening.

 

Ack rip 3rz

 

yep. But I’m still driving her daily. No horribly rough idle. Does have loss in power but I keep driving her till she gives out.

 

https://www.tacomaworld.com/threads/comatizeds-tacoma-2uz-v8-swap.301564/

 

Gobbless. Havent seen that one before. Stoked to read thru

 

I would run burnie's fuel cleaner thru it......ATS
best carbon dissolver for gas engines there is...

505 FUEL & OIL POUR-IN TREATMENT - ATS Chemical (atschemicals.com)

 

The 3.4 will mount up to the motor mounts... but I'm not so sure about the transmission. I've heard it wouldn't fit, but my automatic transmission was actually for a different engine than what I have in mine. I don't know if it was for a 2.4 or a 3.4, but either way it somehow fit to my engine, and yes 4wd. On top of that you will need a new ECU, so that's something to consider. Unless you buy a parts truck with an engine and a manual, I would find another 2.7L 3rz to put into it. If you want more power, then I would spend the money on a turbo kit.