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Re: OK Isuzu masters...riddle me this!
Posted to Technical Theory Forum on 5/12/1999 1 Reply

Hi Grant,

These Isuzus are literally backwards of most. There is no vacuum signal to teh regulator at idle. It's running boosted pressure. On acceleration, a vacuum signal is turned on by the PCM, and thus lowers the fuel rail pressure by about 6-8 psig. The... Login to read more.

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