2001 C320 wagon - stalling at lights
I took this 2001 c320 off my grandmothers hands when she upgraded to a 2010 glk. When I got it, it had just received a major service at about 75k miles. It ran great up to 100k miles, but then it started to occasionally bog down when quickly switching from braking to hitting the throttle. This occured occasionally and only at low rpms. 3 weeks ago it started rough idling at lights, so I would pop it in neutral and rev to 700 rpm or so when it started shuddering and it would go away. 1 week later I got a bad shake at a light and rpms got low enough that the battery warning briefly flashed and I got my first ever check engine light. Went to autozone and they read the code and said it was lean fuel mixture. I sprayed then disconnected maf, no change in either case. Put new air filters in recently.
Just one week later and the wagon is going downhill fast. Now it tries to stall at every light, even if I keep her at 1k rpm. Too unreliable to drive it now, though if I get on the freeway I don't have a single problem.
Haynes manual says among other things that it could be the emmisions system, which I tend to agree with because before this all started I would occasionally smell a strong gas smell through the open window when idling. By the time I popped the hood and got out it would go away. The haynes manual indicates that can be caused by a cloggged egr valve.
My searches on google and this forum seem to indicate successfully eliminating these symptoms via MAF maintenance, but obviously this isn't working for me. Has anyone else experienced these symptoms and found a single definitive culprit?
Last edited by conradiation; 01-10-2011 at 09:46 PM.
Reason: edit for clarity