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

riorust · #1 08-19-2008, 08:13 PM

1993 190E 2.6.

Coming home this afternoon my CEL came on. I checked the codes on the DM by the battery and got an 8, and an 11.

Can anyone advise me on what these mean and suggest methods of trouble shooting?

The car seems to be running just fine, and the fuel consumption seems normal.

Thank you in advance,
David

PS. After a bit of searching I have discovered that a code 8, refers to "Altitude Pressure Signal from the EZL Ignition Control Unit", and a code 11 points to "Air Injection System" ?!?

Are these two systems inter related some how? I had just checked the codes two weeks ago and all was clear. Should I just clear them and see if they come back ?

Arthur Dalton · #2 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 · #3 08-19-2008, 11:28 PM

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

JimF · #4 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 · #5 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 · #6 08-20-2008, 02:25 PM

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

riorust · #7 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 · #8 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.

mbdoc · #9 08-20-2008, 08:04 AM

8) is relating to data exchange from ignition module about altitude compensation.

11) is about the operation of the air injection system.

As Arthur pointed out, can be related to disconnected vacuum lines.