Toyota MR2 Message Board - View Single Post - 20V MK1 Engine Swap Engine stumbles, badly

mr220v · 06-22-2009, 01:13 PM

That vacuum valve is for AC idle up. When the AC is on, this valve opens up and creates a vacuum leak causing the motor to idle up. You're probably not going to bother with AC.

Typical causes for the stumbling are TPS and o2.

06-22-2009, 01:13 PM	#5 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 2,526 Thanks: 13 Thanked 175 Times in 147 Posts iTrader Rating: (11/100% )	That vacuum valve is for AC idle up. When the AC is on, this valve opens up and creates a vacuum leak causing the motor to idle up. You're probably not going to bother with AC. Typical causes for the stumbling are TPS and o2.