i just discovered my 1999 bmw e46 has a tear and crack on intake boot and engine stalls when you start it and eventually switches off but when i disconnect air flow sensor it works perfectly

Asked by Feb 26, 2015 at 12:05 PM about the 1999 BMW 3 Series

Question type: Maintenance & Repair

3 Answers

241,495

Replace the boots and clean the MAF and see if things improve. Do you have a CEL on?

241,495

Disconnecting the MAF causes the ECU to use the TPS and default fuel maps. These maps are defaulted to enriching the air/fuel mixture and that's why things work better. Vacuum leaks, aka ripped hoses after the MAF will make your car run terrible.

47,535

In my BMW Z4 that I used to own...even a miss-installed oil fill cap will make the cel light come on and the idle very rough. These cars are very sensitive to un-metered air leaks.

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