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Coolant on the EGR valve stem indicates an internal EGR cooler leak, which allows coolant into the intake, producing white smoke and rough idle. Turbo failure (B) causes oil smoke, not coolant. Injector nozzle wear (C) causes black smoke. Thermostat (D) affects operating temp but not coolant ingestion. ASE T2 emphasizes checking EGR cooler integrity when coolant is lost with white exhaust smoke.

Exposed cords compromise tire integrity and require immediate replacement. Vehicle is out-of-service until corrected. Monitoring (A) or rotating (C) is unsafe. Inflation (D) does not restore structural strength. ASE T8 emphasizes tires with exposed ply/cord are critical safety defects requiring immediate removal.

Excessive pushrod stroke indicates brakes are out of adjustment or slack adjuster is defective. Drums (C) and compressor (D) do not affect stroke directly. Monitoring (A) is unsafe. ASE T8 stresses adjusting or replacing automatic slack adjusters when stroke exceeds maximum.

If trims are positive with no vacuum leaks and normal fuel pressure, inaccurate air metering is likely. A faulty MAF under-reports air, causing lean trim. A faulty O₂ sensor (A) would skew trims erratically, but switching is usually abnormal. A restricted injector (B) would affect one cylinder, not entire bank. An EGR stuck open (C) dilutes charge but usually sets other codes. ASE T1 stresses checking MAF response with scan tool or scope to confirm.

Frequent purging indicates air is leaking past the compressor unloader valve, keeping the dryer cycling. Governor cut-out (B) issues change cut-out range, not cause constant purge. Foot valve (C) only applies brakes. Linings (D) unrelated. ASE T4 emphasizes checking unloader valves and compressor function when purge cycles are too frequent.