Ok, I did search for this!

I just did a compression test and I was wanting to know what it should be/how my engine is doing.

Here is how I did the test:

I first let is warm up by idealing and then I had to make a trip to the store so I did that. So when I got back it was nice and hot. I then pulled all the plugs (they looked good but they are running a little hot as the MSD makes them?) and undid the ignition so that I would not have any problems with the test.

Now with all the plugs out and the engine still hot I hooked up the tester and cranked her over about 5 times to get a good reading. I then wrote it down and did it again. Wrote it down moved to the next cylinder ect?

All the pressures came up to 180 +/- 5psi.

What is the pressure supposed to be on the 5vz-fe 3.4?

 

I'm no expert but that sounds good to me

 

Yeah i liked the fact that they seem to be within the spec as far as 1 not being a lot lower than the others. I plan on Supercharging it soon though so i want to make sure everything is in tip top shape.

I just can't find what the specs for this engine are anywhere!

 

I can't say for sure but I'm sure someone will chime in. I think 180 is pretty much where it should be to be considered in like new condition though

 

The important thing is the +/- 5psi. 175-185psi compression is good.

Consistancy is good. The variations from one compression gauge to another would make more difference... if your gauge isn't a pro quality gauge, or if it's been dropped, it may no longer be accurate. But the repeatability is still good.

I can't remember what the lower limit is for warranty purposes. It's something riddiculous like 125psi. If one of the cylinders showed that, your engine would definately be hurting. Like short-rodded by water ingestion kind of hurting.

 

Whats the milage?

 

Yeah, seeing a cosistant reading was something i was glad to see. so you know what the new spec PSI is for it? I am just woundering how well it has been taken care of.

It has 125k on it and i just got it a few months ago so i am very curious to see how she was taken care of.

 

You didn't list it, but did you pull the Fuel pump fuse?

The wet fuel in the cylinder could increase the reading... much like using oil in a "wet" compression test...

 

I could not figure out which fuse went to the pump so i just did it with it running but all the pressures came up the same so i don't think it did much to it if anything.

 

^ what he said

 

Like 200 200 200 200 200 140

with 50% leakdown Through crankcase breather Bye bye rings...

 

Ouch that is bad, so is it supposed to be 200 on each cyl.?

I just want to find what the compression is supposed to be from the factory. I have no idea how wel this was taken care of so i am wanting to see if i can get an idea.

 

according to EPC
218psi is new
Min Prssure is 145psi
Diff between pressure should be 15 or less

 

Thanks, and where did you find that? I have looked everywhere!

So it looks like they took ok care of it but for 120k it is not bad. still good enough for a SC i think.

 

Yea mine is at 125k mi but my s/c lost its bearings and i think that is why 1 cyl is now 140

I have the factory service Manuel infront of me here for my tacoma

 

Ah, i need to get one for my truck but can't find them for what i can afford..

 

they are not cheap....send me an email johnny (at) sea2skytuning.com
i can help you out in regards to FSM

 

Per the Toyota FSM 2001

With fully open throttle, and a full charged battery to obtain at least 250 RPM on a warm engine.

5VZ-FE
174psi or higher
145psi Minimun
Difference between cylinders 15psi

Bonus info

2/3RZ-FE
178psi
127psi
14psi

 

Great, so i guess that means it is in pretty good shape for 125k.

I have got to get a FSM...

 

They are handy documents for specs, but kinda pricey. I've used mine enough to feel I'm close to getting my moneies worth, but you can download a digital copy much cheaper. I do find the paper version a lot easier for quick reference around the garage.