Possible dme/ecu failure? I may need PARTS HELP!!!

5146 Views 5 Replies 3 Participants Last post by iss, Oct 24, 2012

tackleberry

Discussion Starter · Oct 23, 2012

So I went to the Indie today. Asking why nothing at all is setting.
There was yet again a pending code p1519 which I replace the part but to no avail. Car is running rich and smells it, and appears that only one oxygen sensor is working.
Secondary air injection monitor is not setting.
O2 not setting.
Cat not setting
Evap not setting

He also said w140 was never a true obd2 car, due to the age mixed with original design. The obd2 port was basically to fulfill government requirements and an emissions reader, compared to later models that were made after obd2 implementation in 96. Because the above he thinks there may be a chance that a generic reader is grounding out the ecm and causing it to appear to never actually set. I trust this because last year I had a monitor hooked up all the time and it never set for 3 weeks bbut star had codes. I removed it and 4-5 days later I had a check engine light, which matched the codes.

The worst case scenario is that he said maybe the slack in the timing chain is bad, and/or the cam magnet setup is messed up.

So....next week we will go for sure. But in the meantime does anyone have an ecu for a 1996 s420 that works and willing to let go for cheap to help a member?

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W140 Heavy

· #2 · Oct 23, 2012

I had the same problem relative to the setting the monitors. This go 'round after about 15kmi they reset. I had to get a waiver last year. Last year my indie told me I needed two ecms (v-12) don't ya know...and it would cost $3500 and there was no certainty it would fix the problem. Yours reads as if it has a legitimate problem.

I was prepared to take this pdf to the OBDII people and tell them, as I read the form, my car was exempt! Since I passed I didn't get to go through that maze.

I think the exemption, if I'm reading it right, means that when your $100k car doesn't pass emissions you don't go see a mechanic...you go see your congressman!

Good luck on this and try not to take it too seriously.