i have a 1982 mercedes benz 380sec 2 dr coupe v8,,
and i was about a week ago and did the smog,,and it failed!,,

this car it was on non operation for all most 2 years,,due to some engine problem, now i fixed and i run it for 50-60 miles and went to smog,,and failed,,

it was timing problem,,and i fixed that,,i did change o2 sensor and catalik convertor,,sparg plugs,fuel gas filter,, and i dont know if this will do the trick with the smog?,, i know the emisions on those papers was very high,,

so now i cant find if it has a EGR valve to see if it opens or closes,,,

any help,,will apreciate

If it has one, it's most likely on the left exhaust manifold, just to the rear of the front cylinder. If you don't have it, there is likely a flat bolt head in the hole, plugging it.

On my m117 engines, the EGR has a ~1/2" pipe curving up from where it is fastened into the header, and into the EGR valve mounted on a bracket attached to the manifold. There is another ~1/2" pipe running from the rear of the valve, around the back end of the left head, and then back forward under the intake manifold to dump just under the throttle body.

If you do have the EGR valve, and are failing for an EGR related fault, it's possible (or even likely) that the end in the intake manifold has become plugged with carbon.

I haven't cleaned mine out yet, but I've heard of owners of the newer MB's removing the valve and using a piece of cable to "roto-rooter" the carbon plug out by stuffing the cable down the pipe and spinning it with a drill to knock it all free.

My only concern would be what it might do to the engine by ingesting the small chunks of carbon, but I might be worrying too much on that.

__________________
-Josh
Testing the cheap Mercedes axiom, one bolt at a time...

yap it has a big bolt on exasth side ,by cilinder nr 1,
and i so a sticker with the vacum system but does not say anything about egr,
here some pic

I don't believe the 380 had an EGR until after 1984. My 1984 380SE (CAL Emissions Version) didn't have one, nor was one called out on the sticker. it did have the air pump that yours has. Your sticker doesn't show or list an EGR valve.

Change the air pump filter in the Air cleaner, put in a new Air filter, change the oil, oil filter, to fresh and fill up with Union 76 91 Octane gas(10% Ethanol). Go drive the bejeebers(30 miles or 30 minutes) out of the car to get the cat hot, then go to the Smog test shop with it hot. Hope you have changed out the Dist cap, rotor, Wires and spark plugs too. This all helps. Also you can remove the air filter from the Air cleaner,(before the 30 minute drive), to do the test and that also will help.

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1985 Euro 500SEC Cabriolet AMG Widebody
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2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
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Best dogs I've ever had.

thanks for all the info,,

okay,,this is what i have changed so far,,
catalic convertor,oxigen sensor,fuel filter,distribuitor cap,rotor,sparg plugs ,sparg plugs wires,

tomorrow i should get the air filter(order), did not find yet the air pump filter!,,
-fixed the timing at 0.05 ''

now for some reason my car when is cold ,,the rpm goes litlle up and down ,,like the transmission is going back in foward when is in parking!,when is hot is okay,,,weird,, it did not do this before,,,maybe from the gas?,,i filled up with some 89 instade of 91!,,

any sugestions on this will appreciate,,
thanks in advance

change all that and still did not pass

stop and reflect a moment....

Does it run right? Idle right? At the correct RPM and the correct CO% level?
Is the ignition to spec (ALL the specs)?
Does it idle smoothly?
Accelerate from a stop well?
The compression's good?

I suspect you're going to say "no" to at least one of those. If so, you're going to have to fix that so it behaves the way the book says it is to behave. When you do, you'll pass emissions (unless of course, you need valves, rings and/or a head gasket).

-CTH

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okay,let me answare the quiz for you:
a.yap runs okay
b.idels okay,now(after fixing the ajuster in the air filter holl)
c.rpm 500-600 thats ok,,,
co% levels are bad on both smog check!,,bingo....
d.ignition is 0.5'' like the sticker on the car say...
e.idel smootly,ok
f.accel ok
g.155-160 compression ok,all 8 cil.

well i looked today at the vacum air diagram
and found two miplaced vacums ,,fixed that.
-here is the pic from smog



-and other thing that one of my friends told me from the 2 papers that it may have to do with,,running rich!''' hc and co are high and no is low that means that is running rich... so now after changing all this things ,,
maybe when i adjusted from the top holl at the air filter,,maybe i turned the scrw too much and is pushing to much gas now that way maybe it faeild the smoke the second time,,or maybe a injector bad or two,,who knows,,the car was sitting for all most 2 years,, dont know,,but it runs,,,
now i need to figure out to pass the smog...

So, it appears that the O2 sensor is either inop OR the fuel mixture is so far out of adjustment that the O2 sensor can't control the mixture.

Do you hear OR feel the frequency valve working?

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MERCEDES Benz Master Guild Technician (6 TIMES)
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do you know where the frequency valve is located?
i have to find it...
thanks

ON your picture # 9 it is what appears to be an electric fuel injeator next to the air flow housing.

With the engine running it should be "buzzing"

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

okay i will check
so this will be the one?:

well this where i ajusted litlle bit ,,



and they say that there is a magic tool to ajust the o2 from this plug,,is it right?

Yes, the item circled in red is the frequency valve. Does it make a buzzing sound while the engine is running?


Yes, with a lamda meter you can measure a frequency at that plug.


On that car setting the fuel mixture by probing the O2 sensor readings would be easier.

The setting should be that the O2 sensor fluctuates around 1/2 volt.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator