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#1
10-17-2012, 09:05 PM
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Rough idle checklist
Hi Everyone,
My engine idles pretty rough (particularly when first start up and at stop signs). I am trying to isolate all potential issues: 1. Carb (weber; had them synched/adjusted recently; still rough idle) 2. Distributor Timing 3. Ballast resistor (replaced this; still rough idles) 4. Fuel pump 5. Vac. Leak Can anyone think of anything else I am missing? FYI: 1971 Merc 250 (w114) Thanx 
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#2
10-17-2012, 10:32 PM
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Valve adjustment.
Equal compression pressures.
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#3
10-18-2012, 01:25 PM
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what color are the plug tips, are they the right ones and gapped properly/
Ditto on the valve lash - set em cold checked your dwell?
__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#4
10-19-2012, 09:45 AM
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Hi MeltedPanda,
What do you mean by color of plug tips (spark plugs). I replaced them all with platinum tips (however I have heard sparse stories of not using plat). When I got the car, the same platinum tips were in, and the benz seems to run fine (well the same as before I replaced them; ie, rough idle).
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#5
10-19-2012, 03:22 PM
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I would seek out plugs that cross with the originals, some may disagree but I would not sugget use of Platimum. What I meant by color is color of plugs tip after they have been in car . Dark black would indicate you are running rich , brown- OK , white - too lean, ect
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#6
10-19-2012, 04:36 PM
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Quote:
__________________
1968 230S Automatic, Elfenbein 1975 O309D Executive Westfalia Camper Bus, Blau/ Weiss 1972 280SEL 4,5 Dunkelrot 1966 VW Type 34 "Grosser" Karmann-Ghia 1963 VW 1500 Variant Pearlweiss 1969 VW Variant Automatic, Perugruen 1971 VW Squareback Automatic, Clementine Orange 2001 E320 4Matic Wagon- Our belated welcome to the 21st century! Polar White 1973 280SEL 4,5 Sliding Roof "The Bomb", Dunkelblau.
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#7
10-23-2012, 05:57 PM
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My first Mercedes was a 1968 W114.
I put the original head on a block that was supposed to be the same as the one that had thrown a rod through the side of the block. Many, many, many hours and a thousand dollars worth of Webers, were spent trying to smooth the idle. I eventually gave up and blamed it on the fact that the cam timing was a half tooth off. Probably wasn't the problem but I felt better. Michael
__________________
Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033 Current have, 1983 300SD 126.120
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