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Old 08-20-2003, 05:53 PM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The MAS relay has 5 functions & shouldn't have any effect on HOW the engine runs.
MAS controls; fuel pump, a/c compressor, air injection pump, O2 sensor heating, & kickdown.

If the MAS relay has a problem then the car shouldn't start OR the check engine lamp should come for the O2 sensor.

The CIS computer must get power from OVERVOLTAGE relay & must apply current to the EHA for the car to have a good cold start. See above posts!!
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