John H

I have a P2422 (Evap) code that I have been chasing for over a year.

I can clear the code but it comes back after a few hundred miles. Now I'm noticing that it's only every few hundred miles between throwing a code because that's how often I have the opportunity to do a full out 0-70 blast or pitch it into a high speed sweeper. It's the G-forces that are triggering the Evap CEL. I just did it last night on a 120 degree sweeper. Also seems to happen with a partial tank of fuel (could be unrelated).

Prior to coming to this G-force realization I have swapped out:

• the fuel shut off valve (Y58/4), which is what the P2422 code point to;
• the charcoal canister;
• the purge control valve (Y58/1); and
• the gas cap.

Now I'm thing it's the fuel tank pressure sensor (B4/3). I did swap this out a few years ago as it is part of the fuel filter assembly. It's possible I got a bad one and I didn't notice for a few hundred miles until I put a G-force load on the car.

Question: could an errant fuel tank pressure sensor trigger a CEL under G-forces? And, is it possible it would show as a P2422 code?

John H

Changed the B4/3 sensor. No help.

I can trigger a CEL with a hard right turn almost on command.

Fuel slosh?

Wiring?

ot1

I had this same problem on an 88 CS5000 turbo, so this is a long shot, and it took me many months to find it but it was a hidden crack on the bottom side of a 3“ air (remembering that it was accordion) boot and it opened under hard G turns, can‘t remember it if was especially left or right turns, sometimes just under hard accelerations it would throw the CEL too. Replaced the boot it made the car a screamer again, fast fun car!

tjts1

So only do left turns... duh.

John H

Thanks for the suggestion but it doesn't appear to be related to the engine torquing to one side.

I was hoping this was a somewhat common problem that a MB mech may have dealt with in the past. Not excited tracing all the vacuum and electrical lines looking for a fault. I still think it's related to fuel slosh - I did change the pump and filter myself 3+ years ago and maybe one of the 3+/- lines that cross between tank sides came loose. Only about an hour or two to open up the tank.

John H

My moma always told me two lefts don't make a right - or it was something like that.

hanscan

don't dance to the left or your wooden leg will unscrew.