code 33 map sensor high

anyone know whats up, the map was around .8-.9 @ idle

Originally posted by customredz
anyone know whats up, the map was around .8-.9 @ idle
Assuming your readings are 80-90kPa, have you checked the vacuum at idle with a mechanical gauge? Unlikely a relatively stock engine would have vacuum that low, but first check it with a mechanical gauge.

Then check the harness connector for the MAP sensor..... they "dry out" and start to crumble, causing poor connections. If that is OK, check the MAP sensor. You would need access to a vacuum device, like a Mit-E-Vac. With the sensor removed from the manifold, but still attached to the harness, key on, engine not running - attach the vacuum pump to the sensor nipple and pull a vacuum while measuring signal voltage. Compare the results to the table in my ScanMaster writeup. (http://members.aol.com/InjuneerZZ/ScanMast.htm)