Car Problem Reports

Mercedes-Benz 420SEL Rubber boot connecting throttle body to intake manifolds may crack

Mercedes-Benz 420SEL Problem
4 Reports
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Model Years Affected: 1990, 1991

Average Mileage: 225,200 mi (200,400 mi - 250,000 mi)

The rubber boot connecting the throttle body to the intake manifold tends to crack. This can cause hard starting, rough or erratic idle, and engine performance problems.
  •  Rookie

    Came on slowly, until could not hold an idle at stop lights. Sound from under air cleaner is a loud whooshing sound like a vacuum cleaner. Also, I sprayed carb cleaner at the boot and the vehicle accelerated.

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