91 MR2 non turbo fast idle
Hello! This is my first post anywhere.
My son's MR2 5sp shredded its timing belt at 165K miles). We changed it and all of the seals using the Toyota manual as a guide.
We turned the engine over by hand several times to check the crank/cam pulley line up and everything lined up as per the manual. We had three sets of eye balls check it.
The engine fired right up and runs fine except the idle is to high. Lowest it will go is about 1300 RPMs.
We have cleaned and checked the throttle body and ISC valve, air temperature, MAP, water temperature, and O2 sensors. We also verified the EGR and its modulator.
All of the above checks were done per the manual (voltages, resistances, # of pulses per 10 sec. period......
We even tried another ECU. NO help.
If we retard the timing the idle comes down a bit but not enough and the performace goes away as one would expect.
If I block the ISC orfice in front of the butterfly in the throttle body the idle does drop to normal. This is what got us checking all of the aforementioned items in the first place.
The ISC has the normal resistance and functions as per the checks in the book with the throttle body off of the car. The voltages from the ECU to the ISC show a change as the engine warms up and the idle speed drops off but they never get near the full close amount of 0 volts and 12 volts.
If the cam timing is off 1 notch of the timing belt would this cause what we are seeing?
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