w108,107 Parts Hoarder
Date registered: Jun 2010
Vehicle: 4Keep:450slc5.0cab 280sl5sp 280se4.5 500seAMG 2sell:500sl92 380se83 300se86 350sl4sp 75slc MorInSig
Location: Philadelphia Area
Mentioned: 29 Post(s)
Quoted: 1677 Post(s)
1972 280SE Help!
Fuel injected D-jetronic, Right? If so, read on. If not, ignore.
When points gap get small on a d-jet, and rpms get low, they stall. The points "float" at higher rpm will allow the cars to run, but stall when rpms get low. If this is the case, the rider on the points has worn down and needs to be regapped. A business card, playing card, or about 0.014 or 0.016" is the gap you should have at the cam lobes I believe.
Spark plugs can foul because those old distributor cams can either wobble or just have a tiny bit of inconsistency that will manifest a no-spark in some cylinders before others.
That is the most common d-jet problem I believe there is.
Replace with pertronix and problem goes away. No more points to wear down. But, points are factory and cost only about $10. Pertronix requires a little wiring and a decision as to whether to include the switchgear in the circuit or not. I never did the pertronix upgrade on mine, but after the rider broke (not just wore down) on the points I installed, I am a firm believer in the pertronix upgrade.
Last edited by Fonzi; 02-27-2014 at 08:35 AM.