Author Topic: New to me 1980 280se, rough start, changing idle  (Read 1876 times)

rumb

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Re: New to me 1980 280se, rough start, changing idle
« Reply #15 on: 04 December 2019, 08:33 AM »
Speaking of spark plug wire if you have aftermarket ones on they need replaced with correct ones.
'68 250S, '77 6.9 euro, '91 300SE, '98 SL500 '14 CLS550

dnaspazz

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Re: New to me 1980 280se, rough start, changing idle
« Reply #16 on: 04 December 2019, 07:30 PM »
U guys are amazing, thanks for all of the help!
Regarding the green and white vacuum check valve, it is located on the vacuum hose coming off the lower portion of the air intake. At idle, that hose is pulling constant air, but the g&w valve is completely blocked and there is no vacuum going from there into the 3 in 1 connector.

What ( who from) are the correct spark plug wires wires?

dnaspazz

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Re: New to me 1980 280se, rough start, changing idle
« Reply #17 on: 04 December 2019, 07:34 PM »
I owe a picture of the fuel cooler

UTn_boy

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Re: New to me 1980 280se, rough start, changing idle
« Reply #18 on: 05 December 2019, 07:48 AM »
You're fuel cooler has low side air conditioning lines running to it, not engine coolant lines. 

Regarding your check valve, in the first picture below it shows it, but it shows to be in a different location.  I' not certain that the parts catalog is always correct. So take it with a grain of salt.  The part number is 000-140-68-60, but that part number is no longer available.  It has been replaced by part number 001-140-16-60.  It's still available from Mercedes for around $10.00.  However, do make sure that someone didn't reverse the check valve first.  I've seen that happen on numerous occasions. 

In the second picture you'll notice highlighted parts.  Make sure all of these rubber hoses are new, as well. 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour

dnaspazz

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Re: New to me 1980 280se, rough start, changing idle
« Reply #19 on: 10 December 2019, 08:53 PM »
Yep, still working. I m getting stuck, since I cant find the info about how/where the original vacuum lines went. So, anybody have pictures of  1980 280se engine bay or a link the the manual that maps out where everything is supposed to go? The 2nd picture above looks almost like how  things are laid out, but it is also off- doesnt show everything that  is in my car!

Also, I am going to take my first shot at adjusting the valve lash this weekend. I am going to do it in the morning, on a cold  engine. A bit nervous, since I doubt this car has been adjusted in many years. Any advice is  greatly appreciated

UTn_boy

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Re: New to me 1980 280se, rough start, changing idle
« Reply #20 on: 11 December 2019, 07:49 PM »
Since you have a CA emissions model you'll have to seek out an M-110 and/or W116 "Introduction into service" manual.  CA emission models are always a class all their own, and no other car in the world had the amount of unnecessary vacuum lines and connections.

Regarding you valve lash, make sure you have the wrench, a new valve cover gasket kit, and try to inspect the rocker arms when making the adjustments.  Each camshaft lobe has to be pointing away from the rocker arm before lash is measured.  Obviously, this involves having to spin the engine.  To do this either hook up a remote starter (the squeeze trigger kind), take a chance and do it by turning the ignition key, or put a 27mm socket on the crankshaft to spin the engine over by hand.  Just be sure you remove the socket before you start the engine......bad things will happen other wise. ;) 
1966 250se coupe`, black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3, papyrus white/dark red leather
1973 300sel 4.5, silver blue metallic/blue leather
1976 280s astral silver/blue MB Tex
1978 450sel 6.9 Euro, Anthr/velour