scanner problems

[Robert W. Hughes]

> Might that cause the extremely rich condition? the engine thinks its
> under load?  If I unkook the MAP sensor at idle, it reports 30 inches
> and trips a code 33 as it should? But I will try a new MAP sensor and
> give howell a call, me thinks that I will dump the howell chip and get a
> stock GM 4.3 chip and go from there, I have no idea what they did to
> that chip, maybe I can talk them out of the bin that they used...yeah

It sounds like they sold you a turbo chip...18"Hg into a 1bar MAP sensor
will produce about 2volts. 2volts into a ecm expecting a 2bar MAP sensor
will be interpreted as 10"Hg. The chip is what controls this.

-- 
Robert W. Hughes (Bob)
BackYard Engineering
Houston, Texas
rwhughe at hal-pc.org