Rough Idle Due to Intake Manifold Vacuum Leak on Mazda 626

The intake manifold gasket can fail causing vacuum a leak and/or a rough idle condition. Replacement of the leaking gasket will be necessary to correct this concern.

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Average mileage: 139,959 (98,000–190,000)
Engines affected: 2.0L 4 Cylinder, 2.5L V6
5 model years affected: 1998, 1999, 2000, 2001, more2002
16 people reported this problem
9 people shared problem details
2000 Mazda 626- 2.0L 4 Cylinder98,000
Car idles roughly while sitting at lights and in park. The rpm's on the vehicle are very low as well.
2000 Mazda 626- 2.5L V6125,000
Whenever I sit at a light, in traffic or through a drive-thru my car shakes and makes a bit of noise. I took it to a repair show and was told I have an exhaust leak.
1999 Mazda 626- 2.0L 4 Cylinder145,000
Rough idle, stalling, idled fine if you kept foot on gas. Intake gasket was blown out. Replaced gasket. All is well
2000 Mazda 626- 2.5L V6150,678
Car is all of a sudden riding ruff. If car is in park and on the speedometer moves from 0 to 20 mph. And finally feels as though transmission is slipping.
2002 Mazda 626- 2.0L 4 Cylinder99,000
Idles low in drive shuts off
2000 Mazda 626- 2.0L 4 Cylinder
car cuts off sporadically
2000 Mazda 626- 2.5L V6190,000
rough idle, engine surges especially when in drive. have to put in neutral to keep running when decelarating.
2001 Mazda 626- 2.0L 4 Cylinder
intake gasket fail sprayed starting fluid to find leak replaced gasket
1998 Mazda 626- 2.0L 4 Cylinder175,000
Surged to the point of stalling. I ended up spraying carb cleaner at the point where the intake met up to the head and found when spraying the carb lceaner at the no 1 cylinder, the engine speed noticibaly changed. The Intake gasket was replaced and the issue was resolved.
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The "Bypass Air Control Valve" can fail causing a low engine idle and possibly stalling.

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