Jimny VVT less power at low revs than non-VVT?

As said, the Suzuki VVT is just a hydraulic phaser unit on the inlet cam pulley. At idle the inlet cam rotates backwards relative to the sprocket to full retarded timing, on load it advances the cam timing. Control is achieved by measuring the inlet cam timing with the cam sensor above the bell housing and vibrating the VVT solenoid control valve backwards & forwards

If the VVT control valve is stuck or the little built in oil filter bunged up it may be on full retard all the time, but I'd expect P0011/P0012 to be set if the desired cam timing relative to the crank couldn't be achieved.


If it is down on power I'd look for restrictions in the exhaust (like a partly blocked catalyst) and inlet (like a blocked or soggy air filter)

Thanks for this. I did replace the catalytic convertor last year. Also, changed the air filter just last week, and did a compression test which seemed ok (all between 140 and 150)

Mine goes so much better than a std gen3 (and gen4 ) mine is 235, 17% gearing, VVT and m16 and even pulling a trailer it is faster up hills than a std jimny

You say you changed the cat, but there is two of them. (sorry for nagging on and on about them).
could it be you changed the broken number one and the powder from it has clogged the next like mine?
I went from doing my test hill in third gear just barely making 80kmh, to doing 120kmh in fifth after replacing the two broken cats with one generic cat for 2.0 motors.

Thanks, Yakuza. I have been thinking about this. I did change the front cat and after that the car went from almost undrivable to what I thought was normal, but maybe the rear cat has problems like you say.

I will get the car booked into an exhaust place to check this.

I was just looking at the O2 sensor voltages at idle.

Does this sensor 2 voltage look wrong? What does it tell me?

​​​​​​thanks
Lee 

Sensor 1 pre-CAT should look like that, the post-CAT sensor should be smooth. Basically it is measuring how much oxygen there is.

The pre-CAT sensor is used to fine tune the fuelling, the post CAT sensor is there to tell if the CAT is working. If the two are both the same or very similar then the CAT has failed.

However, sometimes at tick over there isn’t enough gas going through, check the two traces at a steady rpm, preferably whilst driving at a steady speed.

Robin