toyota vvt-i engine rumbling sound at 3k rpm (innova gas m/t)

**spyghost** · May 17th, 2011 10:25 PM

i don't know if its just me, but i just noticed that when accelerating and upon reaching 3k rpm, there is a very noticeable rumbling sound. it disappears above 3k rpm.

its always rumbling at 3k rpm. bone stock everything.

sound is hard to describe, but its like a grrrr sound somewhere in 3k at any gear.

**desert fox** · May 17th, 2011 11:09 PM

baka mga support mo?:rock:

**spyghost** · May 18th, 2011 07:12 AM

Originally Posted by desert fox

baka mga support mo?:rock:

supports dying so early... hmmm... darn

**kristine123** · May 18th, 2011 09:21 AM

baka yung pulley mo or the tensioner sir?

**vinj** · May 18th, 2011 09:45 AM

Does it also occur when the car is not in gear (stationary then you rev it)? Can you isolate where it is coming from? Sometimes it can be something as simple as a loose screw, bracket or part in the engine bay that vibrates at a certain rpm.

**spyghost** · May 18th, 2011 02:31 PM

Originally Posted by vinj

Does it also occur when the car is not in gear (stationary then you rev it)? Can you isolate where it is coming from? Sometimes it can be something as simple as a loose screw, bracket or part in the engine bay that vibrates at a certain rpm.

this is also what i've been thinking of (possibility). i can't isolate to where its coming from, but its definitely from the engine itself. it gets along with the rev so i can say its the whole engine.

stationary (no load), i don't hear it, but when in gear (any gear), the drastic change in engine sound is very noticeable. if this were vvti-l, i would say its the "L", or the lift kicking in, but its not. i'm expecting a linear change in sound since its just vvti.

i don't hear this drastic change in sound in a 1.3 vvti (vios e). i doubt that its just because this a 2.0l vvti.

**inno25** · May 19th, 2011 05:31 PM

Iyung Innova ko naman naranasan ko rin ng rumbling sounds nung tumakbo ako ng 100 -110 kph sa SLEX. Naka 5th gear ako nun. Diko lang sure kung normal lang to kapag tumatakbo ka ng 100 kph?

**spyghost** · May 28th, 2011 10:07 AM

just an update on this

for some reason, i filled up with total gas yesterday and i noticed that this sound disappeared. engine sound was smoother unlike before.

i use to fill up with petron when i hear this sound.

recalling what happened before when we went to subic, all we had was total to fill up with. after that, we used petron all the way.

i still feel this is not something objective though... makes a bit of sense, but not at all 100%

**altis** · May 31st, 2011 12:24 AM

the rumbling sound that you are hearing might be "katok" sound. Are you using unleaded gas or the XCS from petron. I also experienced it in my Altis, but since i use XCS medyo nawala na sya. You might need to observe the gas that you are using.

**spyghost** · May 31st, 2011 07:28 AM

katok = ping? weird o2 sensor/ecu/injector can't cope

petron unleaded, shell unleaded, caltex silver = all sound the the same upon reaching 3k rpm

i filled up with total premier unleaded again this morning and the sound is gradual - the way i expected it... pity there are only a few total gas stations around