Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-10-2013, 01:34 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
89 300 sel new to me with 193k

Hey guys this is my second benz, first one is a diesel. I picked it up this week for a few songs. After looking at the interior I fell in love with it. I wish my 83 300sd was this nice.

its not passing emissions so I have a few things to do this week on it. I am going to start with the o2 sensor and egr valve. I looked for the o2 but didn't see it, is it before or after the cat? thanks in advance
Attached Thumbnails
89 300 sel new to me with 193k-img_1395.jpg  
Reply With Quote
  #2  
Old 02-12-2013, 09:32 AM
Hit Man X's Avatar
I LOVE BRUNETTES
 
Join Date: Sep 2004
Location: FUNKYTOWN
Posts: 9,013
Thumbs up

Do not throw parts at it!



My 300SEL passes fine without EGR (it was plugged up at the intake plenum so I simply removed it all). Hell, I think Federal M103s in '89 did not even have EGR.

What are your emission numbers? Test the O2 for function, it is precat... if it was post cat it would be attempting to adjust scrubbed exhaust numbers. Remember, these big old cats like to be good and hot when you go to test.

Start with a full tune up, repair any oil leaks, fresh fuel, etc. This stuff is pretty inexpensive all things considered and will give you a solid baseline in which to retest the car.

Plugs
Wire set
Cap
Rotor
Oil service
M103s usually need valve cover gasket and 'U' shaped upper timing case seal
Fan belt
Any questionable breather hoses (probably most/all due to age)
Any questionable vacuum lines (probably most/all due to age)
Fuel filter
Air filter
etc
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
'91 560SEL 189k

Eight others from IH, BMW, GM, Ford, and Volvo.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
Reply With Quote
  #3  
Old 02-12-2013, 01:51 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
I took it back thru yesterday for free and the numbers were worse than when the guy I bought it from took it. NC and Ox are failing.

I put a o2 sensor on and while I was at it, I hit the cat to see if anything felt loose. It was pretty solid.

I tore into the top last night, I found three hoses so far with split ends. One was the vent hose going from the air filter to the valve cover. The other two were the ones connected to the Air valve controller. All three have been ordered.

I went to change the spark plugs and all six wires broke on me. Have those on order. I changed the valve cover this morning and have the rotor and rotor housing on order. It looks like the cover will be a pain to change.

I will go thru the rest of the vacuum system and change anything that is loose or soft. Thanks for your input.
Reply With Quote
  #4  
Old 02-12-2013, 01:52 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
I have to drive about 20 miles to do the emissions so it is nice and warm during the test.
Reply With Quote
  #5  
Old 02-12-2013, 04:57 PM
Hit Man X's Avatar
I LOVE BRUNETTES
 
Join Date: Sep 2004
Location: FUNKYTOWN
Posts: 9,013
Thumbs up

Use anti seize when you reinstall the plugs. Why people do not is beyond me.

The upper timing cover is not too hard to change, just somewhat of a pain. Check the three and four way vacuum connectors, those become brittle with age and create issues.

Fresh oil does help with numbers, sounds silly I know. Something to do with blowby and whatnot.



Failing Nox can be too lean (think of your vacuum leaks...). HC is unburned fuel usually. Post the numbers if you can please.
__________________
I'm not a doctor, but I'll have a look.

'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
'91 560SEL 189k

Eight others from IH, BMW, GM, Ford, and Volvo.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
Reply With Quote
  #6  
Old 02-12-2013, 07:05 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
Nox 6.22 (2.5) is the limit, HC 1.70 (1.60) is the limit.
Reply With Quote
  #7  
Old 03-05-2013, 07:06 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
As of this weekend, Thanks to Hogweed for hooking me up with a fuel line.

I now have replaced the fuel injector seals, new spark plugs, wires, dis cap and rotor (these were really needing replacing), Air filter and O2 sensor replaced. Fixed a hand full of vac lines. Gas smell still exists, I think it is coming from the black box on the fuel dist. I can get another one off of a 420 sel.

Took it thru emissions again today and it was worse than before. Hc 1.99 (1.60), Co 8.98(15.00),NOX 5.95 (2.50).I guess it is time to take the plunge on the cath converter. What do you guys think? It was warmed up, during the tuneup part I found a small leak on top of the radiator. I will replace that this weekend along with the thermostat.
Reply With Quote
  #8  
Old 04-30-2013, 05:12 PM
Registered User
 
Join Date: Dec 2003
Location: Queen Creek Az
Posts: 43
finally passed emissions

went thru and replaced any loose vacuum connectors, belt adj ect. The engine poooors pretty good now. RPM's at idle is between 650 and 750.

After all that and a bottle of 91 percent rubbing alcohol, these are the numbers,

HC .34 has to be less than 1.60

CO 2.02 has to be less than 15.00

NOX 1.70 < 2.50

now I have to change out the exhaust man on my 83 300sd.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 03:45 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page