vvt not working 20v

[pornstr20v]

hi guys i
was on the
dyno pulled 1st run 90kws untuned went to do the 2nd run droped to 34kws just like that checked everything on the car checks cams,cam gear ,timing all sweet
and u cant hear the vvt cross over.we tested all the wiring to the vvt its coming on at 4500 and off at 7500with the test light so its not the wiring

what you guys think is can be ?
where can i get it from?
how much is it ?

the guy sayed this will make over 100kws easy with the vvt working it plays a big role

["Z" UTE]

Sound like the oil passge in the VVTi solenoid is clogged. Clean it or replace it. These things are very susceptable to problems if the wrong oil is used, the passgeways are extremely small, the build tolerences are microscopic.. Toyota recommends 10W-40. It is the low end of the scale you have to look at. If you have used 20W-40, then you will have drama's.

cheers Chuck.

[shelldrake]

Sound like the oil passge in the VVTi solenoid is clogged. Clean it or replace it. These things are very susceptable to problems if the wrong oil is used, the passgeways are extremely small, the build tolerences are microscopic.. Toyota recommends 10W-40. It is the low end of the scale you have to look at. If you have used 20W-40, then you will have drama's.

cheers Chuck.

Looking at a blacktop manual earlier - 20w-50 is recommended for for our climate.(20 to 38 degrees C), or even a 15w-40. - They do suggest 10w-30 for temp evironments ranging from 0 - 38 degrees C.

REFERENCE - http://www.locost7.info/mirror/4age_blacktop.php

Speaking to someone who works at toyota recently - They said for all cars up to and including vvt function they use a 20w-50 multipurpose. vvti is different...

The resistance between terminals of the valve should be 11-13 Ohms at 20 Degrees C. Also, try pulling the solenoid itself out, putting 12v to it, and checking it's function. Clean well,( as chuck suggested perhaps a passage is blocked), replace the o-ring and put back in.

Sounds stupid, but ensure oil level is topped up and oil pressure is ok.

I have heard(But not exeperienced) that the vvt pulley itself (intake side) can be problematic in that once they develop some wear and tear they basically die fairly quickly. Apparently they get quite noisy...

[thechuckster]

slightly on topic: if the vvt solenoid is engaged at idle, will the motor run like it's only got 2 cyl's firing?

[Sam_Q]

shelldrake: well said, when the VVT pulleys go they develop the "tick of death" where they make a loud ticking sound.

chuckster: well it isnt quite that bad but yeah it does get much rougher

[The Witzl]

Is this a blacktop or silvertop 20V?

If its a blacktop - then the transistor that switches on the VVT pulley inside the ECU has a habit of letting the smoke escape.
Open ECU, and look for the cooked TO126 package transistor. Replace, and add heatsink to ensure it does not happen again.

See here - http://www.my-acoustic.com/Car/ECU/2...AP_problem.htm

[pornstr20v]

its silvertop 20V
on the weekend will take the vvt solenoid give it a clean and put power to it if it works then its the pulley

how can i check the vvt pulley is working ?

[Sam_Q]

apart from shorting it out at idle I have been thinking if it would be possible to put a mark on the pulley and watch it change with a timing gun? anyone know if that could work?

[shelldrake]

apart from shorting it out at idle I have been thinking if it would be possible to put a mark on the pulley and watch it change with a timing gun? anyone know if that could work?

This method was also suggested to me. It would be best if you had a timing gun with ajustment so you could tune it to one mark, activate solenoid then check the difference...

[linton]

slightly on topic: if the vvt solenoid is engaged at idle, will the motor run like it's only got 2 cyl's firing?

Was this your problem? My silvertop 20v is idleing like is running on 2 cylinders, at about 450rpm. But it still runs bad above 4500rpm, which i thought would go away if vvt stuck in advance?

[CrAiGzEE]

correct me if im wrong but doesnt the VVT only make the car more driveable at lower RPM? as in being engaged at lower RPM then turn off once its around 4500rpm or is it vice versa?

[linton]

it advances 15 degrees at 4500rpm

[Mr Revhead]

its not rpm specific

[shelldrake]

correct me if im wrong but doesnt the VVT only make the car more driveable at lower RPM? as in being engaged at lower RPM then turn off once its around 4500rpm or is it vice versa?

It my case, it was beneficial to leave vvt on all the way to 6000rpm before switching off. (Above 6k it was better without)

[Mr Revhead]

its on from pretty much idel if you use full throttle
and switches off around 6