StarvingArtist

I think I've cleared up all the ignition problems, but it (99ml320) still runs terrible after about a half hour. Shutting it off and restarting will fix it temporarily. It's not consistent, but often.

In searching for the location of the fuel pump relay, I stumbled across bad cats causing this. Is there any way to check without using a hack saw?

I'd love to get to the bottom of this!

Maj. Dundee

Without knowing the codes everything is assumption/guesswork.

StarvingArtist

these are the current codes:

ESP
C1103-016 RPM Sensor RR L6/4
C1012-008 Voltage supply circuit 87 Overvoltage
C1314-004 Voltage supply solenoid valves A7/3
C1022-000 Fault in CAN communication with ME N3/10
C1022-023 Fault in CAN communication with ME N3/10
C1120-006 ESP Yaw rate sensor N54 or sensor B24/15
C1120-020 ESP Yaw rate sensor N54 or sensor B24/15
C1629-000 ESP charging not avail
C1142-020 Lateral accel. sensor B24/2 or B24/15

BAS
C1012 Voltage Supply circuit 87 Overvoltage
C1025 CAN signals ABS not avail.

None of these will clear.

StarvingArtist

Just to closeout this tread, the fuel pump relay was the random misfire issue. I guess 320,000 miles and 18 years is a pretty good run for a relay.

Spoke too soon. It's acting up again. Worked fine until they used the cruise control.