I've just completed a mass air conversion last night on my 88 mustang. I used an A9P, a C&L for 24lb injectors, and a complete harness from an 89. I pulled the vacuum from the MAP sensor and plugged the line. Car idled perfect right from the start, which from what I was told, mass air runs like shiznit until it learns at first. Weather doesn't permit test driving but my other concern is the MAP sensor. I'm using the stocker from my 88 SD setup, I've read in some places that you should be using one from a mass air car, the part numbers are actually different. How big of a deal is this? Is this a hit and miss issue for some? If anyone can elaborate a bit I'd appreciate it. Thanks.
Your MAP sensor is fine,just don't connect the vacuum to it.No worries.I did all this on My T-Bird quite some time ago.You're good.
When I had SD I ran a BAP from a Mustang in place of the MAP and it ran fine. Just don't hook up a vacuum line to the MAP and you'll be fine.
What they said..
The only time I've heard of an issue was with 1988 specific Mass Air cars -- I.E. the California Emissions Mustangs that were the only ones to receive Mass Air for the 1988 model year from the factory. Apparently the MAP/BAP unit in those cars is quite different. I've never seen one so I can not confirm or deny this info.
Um ok going to ask a silly question for a newbie here, what is a BAP I have a Map and had to replace the vacuum line recently cause the car ran like and smoked and jerked and when I replaced the line it quit doing all of the above and runs ok now. The check engine line comes on from time to time but other than that... Why convert from map to mass air conversion. Ok that is two question?
a MAP sensor is used for speed density. a BAP is used for mass air systems. they're basically the same sensor. they monitor atmosheric pressure or vacuum.
Did I read that you capped the line????
I so it needs to be open to the atmosphere to allow it to work properly
BAP = Barometric Absolute Pressure
MAP = Manifold Absolute Pressure
from my understanding when switching to mass air you unplug the MAP and cap the vacuum line leaving the port open making it a BAP sensor
Unplug the vac line goin to it and cap the vac line off and leave the port open on the
MAP/BAP senor
I took it as he capped the part going to the intake.....which would be correct.