norcalcasey

For the first time in about a year I got a CEL today. P0456. I do smell gas when I fill up the tank completely but usually goes away after driving 20 or so miles. I am thinking tomorrow I will check under the rear seats to see if the tops of the fuel pumps are leaking,I know the W211s had a recall for this.

The only other current issues with the car that might be related.

1. my car doesn't seem to idle quite as smooth as before. Can't tell by looking at the tachometer but I can feel it when at a stop.
2. Also, when the vehicle creeps forward in Drive during traffic, its a bit lumpy, not completely smooth.
3. On a warm start, it always starts, but sometimes it "burbles" to life. It barely cranks at all and then kind of "blub blub blubs" while the tach rises, then falls to a normal idle.

Any other ideas?

Thanks all, Casey

Quickvr4

Answers to questions:
1. Mass air sensors on these cars need to be cleaned / replaced. I have been through 2 on my car.
2. Could be related to the Mass and Crankshaft angle sensor
3. Look at crankshaft angle sensor. Typically you need to replace these. They are easy to do.

norcalcasey

Thanks for the reply, I'll check these things.