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

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.
RepairPal Verified
Average mileage: 225,200 (200,400–250,000)
2 model years affected: 1990, 1991
4 people reported this problem
1 person shared problem details
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.
Related Items:
I have not been able to locate what the throttle body actually is and therefore, cannot find th...
How much would it cost to fix the fuel intake on this car and is it worth fixing?
My Benz just had a new transmission installed and since then, the idle is way too high. This m...
A vibration felt through the center floor of the vehicle can be caused by cracked and/or shredd...
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "

Related Content