Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rotting Vacuum Tees (MAZ0056AP)
Reference number: MAZ0056AP
ROTTING VACUUM TEES
TECHNICAL INFORMATION TIP
ROTTING VACUUM TEES
YEAR(S): 1986-87
MANUFACTURER: Mazda
MODELS: 626
ISSUE & TIP
On 1986-87 Mazda 626 models, fuel vapor may rot the vacuum tee under the throttle body. This will cause the vehicle to idle poorly and fail smog tests. The same vacuum circuit runs the air injection air control valve. Remove the intake duct and replace the plastic tee with a metal type tee. I have probably seen this problem 20-25 times in the past two years.
Courtesy of Import Service Magazine with thanks to:
Steve Spilman
Diablo Mazda
Walnut Creek, California
REFERENCE NUMBER
MAZ0056AP
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
