Rolling Road Day Results

[petec]

Unfortunately I have bad news to report, there’s something not quite right with the airflow on my two. Question is what’s causing it ? AFM, ACIS ???

First thing is I know the black canister for the ACIS doesn’t appear to hold any pressure. So this is the first thing I’m going to replace.

Check out the graphs for yourself. According to Charlie at Surrey Rolling road its fueling correctly but because of the lack of air flow its over fueling.
Any ideas guys ?

http://www.peterchaplin.co.uk/myv6/images/RR01Jul07070.jpg

http://www.peterchaplin.co.uk/myv6/images/RR01Jul07072.jpg

[petec]

Pics from the day
http://www.peterchaplin.com/rrday/

The day was organised by Reece (Caribbean_Blue) from IMOC, thanks goes to him for a great day out :thumbsup:

[Paul Woods]

lack of airflow would indeed mean something along the lines of the ACIS pete,ive had my doubts about that acis vacuum cannister,if its not holding vac the acis wont open....and also you need to check the acis vsv itself is opening which involves wiring an LED onto its signal wires to check that...

A/ its getting a signal
B/ the vsv itself is opening when it gets that signal,you can check this by giving the vsv 12v and earth yourself and try and blow through the vac pipes.

If you arent getting airflow at higher revs then the ACIS has got to be why.

[loadswine]

Boy, does one thing make all that difference if its wrong. I thought that a standardish 3vz would be pushing 200 or so, so that flap must be crucial to kill off about 50 horses! Hope you get it sorted out mate.

[Garbe]

Silly but are you sure you had the pipes on the cannister correctly
I've been scratching my head all day trying to figure out if mine are on right:confused:

[Paul Woods]

yeah nige the ACIS is very important,it halves the amount of airflow at higher rpm if it isnt working.

[petec]

FYI

http://www.peterchaplin.co.uk/myv6/images/acisdes.jpg

http://www.peterchaplin.co.uk/myv6/images/vsv4acis.jpg

[petec]

Right ok, after getting home from work the first thing I did was check the vac canister

http://www.peterchaplin.co.uk/myv6/images/vactest.jpg

It seems to be ok, which is great news considering I spoke to MR T at lunch time today and they want £100 for a new one. The tubes were round the wrong way but that was prob me trying to fix an earlier issues which turned out to be the fuel pump.

So next I checked the ECU \ ECM was giving out the signal to the VSV by rigging up a very crude lamp on a length of cable and connected it up to the VSV connector and drove the car round the block. - it was fairly intermittent but that could just be down to the manner in which I connected up the wires into the connector. Also note no loss in performance.

Tomorrow I will check the following on the VSV

http://www.peterchaplin.co.uk/myv6/images/contcheckVSV.jpg

http://www.peterchaplin.co.uk/myv6/images/airflowvsv.jpg

[Paul Woods]

very thorough tests pete,thats what we like to see,gets to the root of the problem much faster and more efficiently.

Also suck on the vac pipe going to the ACIS diaphragm,just to make sure its actuating.

[petec]

Thanks Paul, we'll get there in the end. :idea:

In the manual toyota suggest just starting the car and revving it and look for the actuator moving. Is this the case or does it only work when it starts getting a speed signal?

[Paul Woods]

you know off the top of my head i cant remember if it moves or not when the cars not being driven...just thought of a quick test you can do....wedge the ACIS actuator fully open and try the car up the road,you should have less torque at lower rpm but once it gets up to 4k rpm you should hear the induction roar and it should feel a lot faster than before.

[petec]

In that case its fooked, thanks for the info Tony.

I drove to work this morning with the valve tiewraped open and it gave a better punch in the midrange in the area I would expect looking at the dyno results

Dyno full view (http://www.peterchaplin.co.uk/myv6/images/RR01Jul07070.jpg)
Dyno Closeup (http://www.peterchaplin.co.uk/myv6/images/RR01Jul07072.jpg)

[Paul Woods]

thanks tony,i couldnt remember mate.... well pete all you have to find out is what on the ACIS isnt working,try sucking on the actuator feed and see if the rod moves,it should do!

[petec]

well I’m totally confused. :confused:

1.I gave the actuator a suck *careful now* and it moves with very little resistance
2. Measured the resistance of the VSV = 40 ohms

3. Put 12V to it and blew threw the tube.

4. whilst dismantling the system I had a nice satisfying release of pressure from the vac tank.

5. So I went back to the ECU output at the VSV end and connected to that with crimped spade connectors this time and it appears to be working correctly, 3K to 5K revs on more that 60% throttle.

So what the feck is going on? :blowup: it doesn't open whilst on the drive, yet the light flashes so maybe there's either

a) not enough juice to open the VSV
b) not enough pressure

Next is 12v on the VSV on the engine with the engine running.

[Paul Woods]

now that is odd.... you're going about the fault finding in a very efficient way though mate,elimination is the key.

I cant add any other suggestions just yet.... when you wedged the acis open did it feel much better in the midrange and higher up?

[lodgeman]

i have the same problem in that the acis valve doesnt open. it did! but now it doesnt :doh: i changed the valve thingys:hand: and that made no difference,so in the end i just plumbed the acis valve straight onto the p port on the throttle body.

[petec]

when you wedged the acis open did it feel much better in the midrange and higher up?


Yes I did mate - I may fit a micro switch to the stop on the actuator arm incase it is working whilst driving around



I drove to work this morning with the valve tiewraped open and it gave a better punch in the midrange in the area I would expect looking at the dyno results
Closeup

[chris99]

Just put the vac pipe through the drivers window and give it a suck when you need to overtake :hidesbehi :tease:

[Joshstix]

I know I'm coming in to this late but I think you might be a bit confused about what the dyno graph is showing you.

From 4500rpm it starts going mega lean, meaning that there is not enough fuel for the amount of air, rather than a lack of air flow. I suspect you might have a bad fuel pump.

Oh it's also pretty bloody risky running an engine hard with an AFR leaner than 15:1. You're really risking melting a piston.

[loadswine]

Just been re reading this and wondered if you sorted it Pete?