High fuel consumption

Car sat for 5 years, and when started using it, fuel consumption almost doubled. Car is in great shape ( M series) and plugs, wiring, vacuum connections, air filter appears OK. O2 sensor has 120,000 km on it.
Any quick suggestions?

Originally Posted by vickovacs

Car sat for 5 years, and when started using it, fuel consumption almost doubled. Car is in great shape ( M series) and plugs, wiring, vacuum connections, air filter appears OK. O2 sensor has 120,000 km on it.
Any quick suggestions?

Clean the ICV, air flow sensor, and throttle body real well and look for deteriorated rubber boots, vacuum lines, etc. After sitting for 5 years lots of stuff could be affected. I'd put in a new set of plugs too.

Thanks! Working on all the suggested checks as well as new plugs.

Originally Posted by vickovacs

Thanks! Working on all the suggested checks as well as new plugs.

Oh yeah, the Oxygen sensor is overdue. Look it up on Amazon, they're usually the cheapest source.

Supplier sent me a four wire sensor, my 533i takes single wire O2 sensor. Du you think that I can hook up only the black wire ignoring the other 3 ? I got no response from supplier.
Thanks.....Vic

Originally Posted by vickovacs

Supplier sent me a four wire sensor, my 533i takes single wire O2 sensor. Du you think that I can hook up only the black wire ignoring the other 3 ? I got no response from supplier.
Thanks.....Vic

Two wires are usually for the heating element. If you can find the right one, it probably will work. Too bad because the one wire sensors are usually alot cheaper.