Quote:
Originally Posted by Gregski
thanks I tested the line and the modulator's response to vacuum and even replaced the modulator for a brand new one already
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Is it an adjustable modulator ?
An adjustable modulator can control amount of vacuum going into the modulator diaphragm.
Quote from another forum:
The modulator valve controls upshift via the engine vacuum so WOT = no vacuum = shift at max RPM. I learned this when I had no line going to the modulator valve it would not upshift till near redline!! even with no throttle.
So closing the valve with the screw will increase the shift rpm, open is the reverse. Not sure which direction you need to go, but that's the operation theory of the valve itself.