A little help with codes please! - PeachParts Mercedes-Benz Forum

Arthur Dalton · #1 08-19-2008, 10:59 PM

There is a plastic vac line that goes from the intake to under the engine front cover and hooks to the AIR system SOV . They crack/break from heat fatique. Pull the cover and check it ..if bad, replace w/rubber vac line the full length.
Clear codes................

riorust · #2 08-19-2008, 11:28 PM

Thanks Arthur, I will do that tomorrow. Question... SOV...does that mean shut off valve?

JimF · #3 08-20-2008, 10:16 AM

Quote:

Originally Posted by riorust

Thanks Arthur, I will do that tomorrow. Question... SOV...does that mean shut off valve?

SOV = Switch Over Valve . . that feeds the AIR pump. Usually a broken vac line . . every once in a while it's the SOV.

riorust · #4 08-20-2008, 02:12 PM

Quote:

Originally Posted by Arthur Dalton

There is a plastic vac line that goes from the intake to under the engine front cover and hooks to the AIR system SOV . They crack/break from heat fatique. Pull the cover and check it ..if bad, replace w/rubber vac line the full length.
Clear codes................

Okay, I replaced the plastic vac line running under the front cover, as well as a few other suspect (ie: shot) vac lines. I've cleared the codes, the CEL is not on with the engine running. I suppose I'll have to drive it a bit and try a cold start to see that the smog pump engages.

Arthur Dalton · #5 08-20-2008, 02:25 PM

Correct.............

riorust · #6 08-20-2008, 03:41 PM

I'll do that and report back.

The funny thing is that I meant to replace all the vacuum lines a year ago when I got the car, as part of establishing a baseline. I just never got around to spending the 1/2 an hour and $8.00 worth of vacuum line.

I did all the fluids, filter, ignition components, and check the brakes....just forgot about the vacuum lines. The engine seems to run much smoother than it did yesterday.

Arthur Dalton · #7 08-20-2008, 05:08 PM

Yeah..why fix a few vac lines when gas is so cheap.....

Your fist tip off [ before CE and codes] was a crap running engine.

I'll bet we could diagnose vac leak as the cause on every Emissions Code/CE lamp and be correct 75% of the time.

riorust · #8 08-20-2008, 10:22 PM

Alright, I just cold started the engine and heard the smog pump run for maybe 2-3 minutes before it cut out. I went for a drive with the AC on and got it up to operating temp, came home and checked the codes again.....just 1 blink.....could that be it? I mean it is kind of anti-climatic (in a good way), but could I be done for now?

Arthur Dalton · #9 08-20-2008, 10:26 PM

Single Flash means the N/59 diagnostic module has done all emmissions self test and they all pass , so you have remedied the fault that originally brought on the code and activated the CE Warning lamp................