Failed dreaded smog w euro - PeachParts Mercedes-Benz Forum

C.Doner · #1 06-20-2013, 12:55 AM

is well. You have to make sure everything is in working order. Tune up, plugs, rotor, wires. Check all vacuum hoses. It could be a combination of things. Also if the Cat. is coated with stuff on the inside sometimes running for a long time at high revolutions can clean it out. You would want to drive above 2500 RPM's as long as possible to heat it up and burn the stuff out.

CamelotShadow · #2 06-20-2013, 05:57 AM

Thanks, all good points.
History of this car is it was run minimally say 200 miles per year when I got it in 2007.
I have been almost as bad running it short distance local.
I have used techron gas adative but not recently.
I did run it 30 miles before the test at 40 to 50 mph.
I'm not sure what speed it runs at 2500rpm.
I guess its worth a shot to try to revive the cat.
Could I run it at 2500 in park?

Wires, plugs rotor & distributor cap have less than 2000 miles. Would this need attention?
I tried to change all the black rubbers I could get access to.
There were some in the back.

My car does not have the electronic idle.
Its manual but not sure how that affects it.

I have applied for up to $500 worth of reimbursement for emisson related repairs. It seems best to get it fixed if I can get the money back.
These repairs have to be at state approved shops

I think I should take this back to my orig euro thread as I want to load some diagrams & pics of the vacumn hook ups.
I still may have something wrong.

My 1st inquiry is that this hos out of the manifolds is? It goes no where.
Asked Enrique 2x & have no answer.
I guess its before the cat so it doesn't seem that it would effect emmisions but I want to hook up things right.

Thansk for the details of the egr. Its possible some line or vac is loose/ cracked so still could be egr related with a good egr?
My mechanic said the egr is working so does that mean it does what its supposed to?
EGR is vacumn & think it has 2 metal tubes on either end. Its above the valve covers
I would hope Enrique would check it properly.
I'm still not sure of direction of airflow or operation of EGR but it can't hurt to try & check for buildup

This is a diagram but hard to follow

I was checking relays & red top OCR wiggles in its slot... possible intermittent connection?

Thanks a bunch!

C.Doner · #3 06-20-2013, 12:40 PM

When you start cold how does it run? Do you get a fast idle for a minute or so while it warms up? It should slow to normal within a few minutes. Does it run smooth then act roughly after it is warm? If so then you have a lean fuel condition. That would point to a vacuum leak. I would be sure all vacuum hoses are good before even looking at the Cat.
It looks like previous years you were very close to a fail. One you were at the limit exactly on HC. That leads me to believe this issue has been going on for a while. You just noticed now because it got worse. Driving it that way would do the Cat in. It is possible your Cat has been on the way out for a while causing the high readings. It is also possible that driving the car with it not running well killed the Cat. If it is the latter you need to address both issues. If you get a new cat and it still runs funny it wont last long.
It looks to me like you have a lean mixture. Low CO and high HC points to a lean fuel ratio.
That metal hose is a heat riser. It should connect to the bottom of the air cleaner. It looks broken. That wont cause emission trouble. Its part of the warmup cycle and opens a valve on the air cleaner for fresh air I believe. See if you can find where it goes under the air cleaner. You can get a new riser easily from a hardware store. It looks like foil right. My old Nissan had its heat riser off for years. I really doubt that is your issue, but it could cause a fail for the visual inspection part of the smog test.

CamelotShadow · #4 06-20-2013, 08:21 PM

Quote:

Originally Posted by C.Doner

When you start cold how does it run? Do you get a fast idle for a minute or so while it warms up? It should slow to normal within a few minutes. Does it run smooth then act roughly after it is warm? If so then you have a lean fuel condition. That would point to a vacuum leak. I would be sure all vacuum hoses are good before even looking at the Cat.

Runs strong on start at higher rpm as it has a wur & its a air controlled idle. Runs first at 1200 to 1500 rpm will then will settle down to 750 in about 5 minutes. Car idles 750 to 600rpm (with AC) in drive

Quote:

It looks like previous years you were very close to a fail. One you were at the limit exactly on HC. That leads me to believe this issue has been going on for a while. You just noticed now because it got worse. Driving it that way would do the Cat in. It is possible your Cat has been on the way out for a while causing the high readings. It is also possible that driving the car with it not running well killed the Cat. If it is the latter you need to address both issues. If you get a new cat and it still runs funny it wont last long.

2009 high NO fail was brought down alot by new oxygen senser. tempted just to get a new one to pass it & then address the other issues.
still the failing makes me eligible to get a new cat for free so maybe I should just do that too.

Quote:

It looks to me like you have a lean mixture. Low CO and high HC points to a lean fuel ratio.

It was leaned in 2009 to pass smog & was left that way by advise of MB motors

Quote:

That metal hose is a heat riser. It should connect to the bottom of the air cleaner. It looks broken. That wont cause emission trouble. Its part of the warmup cycle and opens a valve on the air cleaner for fresh air I believe. See if you can find where it goes under the air cleaner. You can get a new riser easily from a hardware store. It looks like foil right. My old Nissan had its heat riser off for years. I really doubt that is your issue, but it could cause a fail for the visual inspection part of the smog test.

Its not foil its a solid metal corrugated tubing of approx 1 inch diameter. There are 3 closed off opening on back of air cleaner so maybe it went in one of those. The hose is coming up from some thing underneath but I can't see where it originates. Possibl part of car before it was converted to US? I

CamelotShadow · #5 06-20-2013, 08:55 PM

Quote:

Originally Posted by C.Doner

When you start cold how does it run? Do you get a fast idle for a minute or so while it warms up? It should slow to normal within a few minutes. Does it run smooth then act roughly after it is warm? If so then you have a lean fuel condition. That would point to a vacuum leak. I would be sure all vacuum hoses are good before even looking at the Cat.

Yes it is hi at start up. It has a warm up regulator & a air controlled idle valve. It does come down after a while. I'll ahve to double check but I do know its rpms in drive stiing still are about 550 600? hard to tell exactly.

I'd like to check vac hoses but not sure if I can. I did change all the soft rubber connections on anything I could get access to.
Could not get to 2 or so behind the foel distributor on pass rear side.
Afraid to pull them off after breaking the 50C red plastic nipples off the valve behind the wur.
Enrique onstalled a new one.

Used to be hard to start when hot.
Enrique installed a new ccumlator so now it starts warm after a few revs.

It does run lumpy after got starts???

Quote:

It looks like previous years you were very close to a fail. One you were at the limit exactly on HC. That leads me to believe this issue has been going on for a while. You just noticed now because it got worse. Driving it that way would do the Cat in. It is possible your Cat has been on the way out for a while causing the high readings. It is also possible that driving the car with it not running well killed the Cat. If it is the latter you need to address both issues. If you get a new cat and it still runs funny it wont last long.
It looks to me like you have a lean mixture. Low CO and high HC points to a lean fuel ratio.
That metal hose is a heat riser. It should connect to the bottom of the air cleaner. It looks broken. That wont cause emission trouble. Its part of the warmup cycle and opens a valve on the air cleaner for fresh air I believe. See if you can find where it goes under the air cleaner. You can get a new riser easily from a hardware store. It looks like foil right. My old Nissan had its heat riser off for years. I really doubt that is your issue, but it could cause a fail for the visual inspection part of the smog test.

Its a 1 in solid coiled tubing. Would not call it foil & there is no open connection under the air cleaner that I ca remember but could re check. Don't think I would miss that

CamelotShadow · #6 06-20-2013, 08:31 PM

Quote:

Originally Posted by C.Doner

is well. You have to make sure everything is in working order. Tune up, plugs, rotor, wires. Check all vacuum hoses. It could be a combination of things. Also if the Cat. is coated with stuff on the inside sometimes running for a long time at high revolutions can clean it out. You would want to drive above 2500 RPM's as long as possible to heat it up and burn the stuff out.

Tune up, plugs, rotor, wires. Check all vacuum hoses. It could be a combination of things
Checked rotar & cap & they are clean. Wires are pretty new so should be fine.

Would be nice to see condition of plugs to see how they are firing. Will have to look into that

2500 is normal highway speed I can arrange for that if it would help.
I'd even try to run it in park if it won't hurt the engine...???
Is this a possibility?