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.
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HOMESERVICE MANUALSMAZDA2008TRIBUTE S SPORT, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)EMISSION SYSTEMS & SUB-SYSTEMSEGREGR VALVE
2008 Mazda Tribute s Sport, 4WD
EGR Valve
2008 Mazda Tribute s Sport, 4WDSECTION EGR Valve
WARNING: This page is about a different car, the 2002 Mazda Tribute, 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure all vacuum hoses are correctly routed and securely attached. Replace any crimped or broken hoses. Ensure there is less than one in. Hg vacuum to EGR valve at idle with engine at normal operating temperature.
- Remove and plug vacuum hose at EGR valve. Connect scan tool to DLC. Access DPFEGR and RPM PIDs. Place transmission in Neutral. Start and operate engine at idle. Note idle speed. Using a hand-held vacuum pump, slowly apply 8-10 in. Hg vacuum to EGR valve for 10 seconds. If engine starts to stall, increase RPM to maintain 1000 RPM. Look for following:
- EGR valve starts opening at about 1.6 in. Hg vacuum indicated by increasing DPFEGR PID voltage.
- DPFEGR PID voltage increasing until EGR valve is fully open. DPFEGR PID voltage should read 2.5 volts minimum with full vacuum applied.
- DPFEGR PID voltage steady when vacuum is held. If voltage drops within a few seconds, the EGR valve or vacuum source could be leaking.
- Service or replace EGR valve if engine does not stall or idle speed does not respond as specified. Unplug and reconnect vacuum hose at EGR valve. For additional EGR system testing, go to appropriate SELF-DIAGNOSTICS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.