Engine sound with different throttle actions (warmed up)
Engine warmed up, this is the sounds when:
- consistent throttle to about 4000rpm
- flat-to-the-floor throttle from idle
- flat-to-the-floor from about 1500rpm.
The two consistent observations I have are:
- When the throttle is released the revs drop to around 1100rpm and then after another 4 secs so drop to the 750rpm idle. This response seems a little slow?
- The distinct ‘gulp’ and hesitation when the throttle is floored. I understand induction noise, but this is almost as if the butterfly isn’t opening smoothly? Or could this be a failed intake manifold (as some have suggested)?
Isolating tps and dc motor noise
I’ve tried to replicate the ‘screwdriver to the ear’ technique but placing a dictaphone directly against the throttle body components – all at idle – included the nearby injector rail just to highlight that the ‘ticking’ it is not the injectors. I really don’t know enough about these to know what they are supposed to sound like…..
Just for interest I’ve added some images of the LPG system below as well.
