Will the MAP cause high idle issues? I just finished a vortec TBI swap in my 95. Starts up great except that it idles at 2500 to 3000+ rpm. Thought it must be a vac leak. Went through all the vac lines and one by one disconected the line and plugged the port. When I got the the MAP vac line and tried it. It idled down normal then started to sputter and stall after about 30 seconds. But the vac line to the MAP looks fine. The sensor worked fine on my old motor what could cause this now? Can the sensor itself leak? Or can the map cause the ecu to make it idle up like that? I actually have no idea what the MAP controls.
roademon
i've never seen a map sensor go bad on these engines. still sounds like a vac leak. could be leaking around the intake manifold possibly? Is there a little o ring on the map when you took it out? If not I believe there should be
When I transfered it to the new engine i never even pulled the vac line from the map sensor. I tried changing the vac line with still no luck. But still if i pull the line and plug the port on the manifold it idles at 800-1000. I'm going to go to the junk yard today and grab a map sensor just to see if it helps. I'm wondering if someone knocked the sensor off my work bench and cracked it inside or something.
did you look on both map sensors to see if one has the little o ring and maybe the other doesn't? I wouldn't think the lack of the egr would be the problem.
well if i just unplug the sensor it idles down so now i'm not thinking it's leaking. the truck wont drive either. it's manual transmission and under load the motor chokes and stalls when i try to drive it, there's something else going on with it. Wish it wasn't obd1.5 so I could scan it easily.
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