I am having a serious trouble with my 1ggte, it is running to lean (A/F meter on the first red led) between 1700 and 2200 RPMs with popping sounds and hesitate.

Below or upper that range the engine runs smooth so, it is difficult to drive with this lack of power on starting.

After check and inspect AirFlow meter(stock), calibrating TPS (Supra 7MGTE), cleaning Idle valve and injectors(7MGTE), inspecting for air leaks, checking earth to the computer(stock + SAFC), checking knock sensors, I do not have idea about what is causing this improper operation of the engine (no code errors stored on computer).

Smooth idle at 700RPM on ~11 deg. of advance (jumping Te1 and E1), but rich on Air/Fuel (sometimes it bounces but a little), and ~16 deg when it is running normal advance.

When the engine passes 1600 RPMs it starts to run bad. I think, because the computer sets too much advance, the timing mark on pulley goes to much advanced like the picture attached is showing.

I am not shure if this is normal to jump a lot, too fast.

Passing 2300 RPMs, the engine runs well an the A/F leds bounces keeping this, on the stoich range(yellow leds) if the pedal is pressed suddenly it goes rich and then start to go stoich.

On the highway driving, 3000RPMs and up, the A/F meter shows fast bounces on the stoick range.

One last note, when the engine start on the morning and when it is cold, it works fine on high idle and rich A/F meter, when it is starting to warm the problem begins, when it reachs normal temp it is still driveable but after driving a lot, the situation is a headache.

Somebody knows where is the problem?


Thanks for Your interest.