Firing order is 1-3-4-2.
Yes, you start with # 1 on compression stroke at TDC, ie cylinder # 4 valve overlapping.
Without any trouble codes, the only way to test the MAF or MAP is with the aid of scan tools.
Try cleaning the MAF with MAF cleaning spray and see if it helps. Sometimes when air flow sensors are dirty, they would not work correctly and does ot trigger any trouble codes.
Monday, November 1st, 2010 AT 7:30 AM