Re: 88 F150 5.0 MAP sensor ?
"SSJ" <email@example.com> wrote in message
> My 88 F150 has been idling poor or not idling at all, surging at stop
> lights and poor acceleration like a plugged converter. I've changed the
> exhaust system(converter also), IAC, EGR,plugs, wires,cap,rotor and fuel
> filter.No change, but if I unplug the vacuum hose to the map sensor, it
> idles good again cept for some black smoke from exhaust pipe.Dumb
> question, but sound like I need a new MAP sensor?I'm tired of putting
> money in where it doesn't belong.
To test the MAP, unplug the ELECTRICAL connector, not the vacuum and go for
a ride. If it is bad it will run better when unplugged. Plug and unplug with
the key off.