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280se idle

Started by trevmerc, 24 August 2022, 03:55 PM

trevmerc

Hi all, Trevor from Tenterfield NSW Australia, my 1974 280se has a very high idle speed and i don't know how to reduce it to the correct idle speed, any suggestions? Plus as the engine warms up the idle speed increases! What should i look at to fix this.
Thank you
Trevor   

raueda1

What's the fuel system of the car (K-jetronic or something else)?
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

Gpapaniko

Quote from: trevmerc on 24 August 2022, 03:55 PMHi all, Trevor from Tenterfield NSW Australia, my 1974 280se has a very high idle speed and i don't know how to reduce it to the correct idle speed, any suggestions? Plus as the engine warms up the idle speed increases! What should i look at to fix this.
Thank you
Trevor   

Hi Trevor, what idle speed is the tachometer showing. I find that in park the idle speed and after a cold start the the auto choke stays on. On my 280sel It's only when I've driven a few k's does the idle speed drop from as high as 2000rpm to about 600rpm after being fully warmed up. It's pretty normal for them to stay on high idle after a cold start.   Mine Is a kJet fuel infection system
Never stop loving
1980 280SEL

Randys01

ok.it's a D jetronic. We know that because of its age.

so..D jetronic experts...step up plz?! ;D

UTn_boy

Being D-jetronic could mean only a handful of things......bad idle control valve, leaky intake manifold/injector seals, ignition timing too far advanced, vacuum lines disconnected, bad vacuum box on side of distributor, or any combination of the aforementioned.  There is no "tip" or "trick" or "magic screw" to turn that'll magically fix everything.  After you have confirmed that the ignition timing, ignition point dwell, and valve lash clearances are in check then and only then can you proceed further to investigate other issues.  Otherwise, you'll chase your tail. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo