![]() And I'm running it on some branded 0W-20 stuff right now. Luckily, the car had full dealer service history for its 88k miles before I got it. Plus I don't really know the intricacies of the system - I'd assumed that it was only effective at higher RPM and so might not have caused my low RPM driveability issues? but it had occurred to me that the VVTI system was one area where I'm unable to determine the true condition of the mechanical system (filters and the variators - not sure of correct terminology on Toyotas. I've tinkered a lot with this car and changed many parts, mainly as it's a hobby (/obsession) of mine. I'm not sure if the set-up of these stops is causing my driveability issues.Īny tech info greatly appreciated, thanks.īob, thanks for your help in digging out this info on the TB and TP, it's greatly appreciated. My assumption (and it's just that) is that this 'closed' position is related to the EGR system, in working to reduce the fresh air during opening of the EGR (and that the closing function is also not to prevent overrun on engine shut-off like on some diesels). The return spring closes against this stop, with the motor having to work in one direction to open the butterfly.īut there is an additional 'almost closed' stop (grub screw on beige segment) where the motor has to drive in the opposite direction to seemingly fully close the butterfly. ![]() ![]() But this Denso design is unusual in that there seems to be a throttle stop (grub screw onto black segment in attached pictures) for the conventional 'idle' position - i.e. ![]() I've tinkered with other throttles in the past, mainly cleaning and replacing position sensors, and maybe adjustment of the throttle stop. I'll add that I have changed almost all the other engine sensors and actuators (for a multitude of reasons) and so am only asking about the throttle body. the final bit of deceleration and first bit of acceleration isn't smooth. I'm having a driveability issue at very small pedal positions, where it's abrupt when the throttle seems to close and open. does anyone have any tech info or details on any bulletins about the function and/or setup of the above (or similar Denso) throttle bodies? ![]() Hi there, I've trawled the web and here but with no success. ![]()
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