280SL 1968 won't start.

[stickandrudderman]

I have isolated the WRD hose and blanked it!

If you've isolated the coolant hose then you are running on permanent cold start which means rich condition.

remove the air filer from the WRD and monitor its function from there. Plenty of info on this site if you care to search.

[ja17]

Thierry,

If your engine is running on all six cylinders now, make sure your linkages are still correct, make sure your WRD is closing, make sure your cold start valve is not leaking, make sure your timing is correct and make sure all is in good tune. Your fuel pressure should be up to specs. Now if it is still running rich, you can remove some round shims under the Barometric compenstator (altitude sensor). Removing one or more round shims will cause the engine to run leaner at ALL speed ranges.

[Thierry du Laos]

Thank you very much Pawel for this very complete summary. (dziękuję bardzo)
I will study this very slowly and try to apply on Satruday.
I will let you know further. Thanks.

[Thierry du Laos]

Stick,
I blanked the air hose of the WRD, not the water lines.

[Thierry du Laos]

Yesterday I took out my shims of the WRD and it seemed better on IDLE only.
Not on acceleration.
And I just learn with your comments that this screw works only for idle!!!
So I need to find and try the other screw that work on ALL regimes....
Cross fingers.

I hope that after trying everything I can succeed!
Because after I investigate around, there is no place that can bench test the FIP.
So only one way, I have to fix it myself.
That's why the garages in Laos take out the original engines and install Toyota or Nissan instead!!! Also a 300d Adenauer that had been the last king's car.

[Pawel66]

Thierry,

If your engine is running on all six cylinders now, make sure your linkages are still correct, make sure your WRD is closing, make sure your cold start valve is not leaking, make sure your timing is correct and make sure all is in good tune. Your fuel pressure should be up to specs. Now if it is still running rich, you can remove some round shims under the Barometric compenstator (altitude sensor). Removing one or more round shims will cause the engine to run leaner at ALL speed ranges.

Thierry, I would do exactly what Joe says before getting to the other adjustment screw. Are you sure that poor engine work on acceleration is because of rich condition? It is often the ignition timing thing...
 

[Garry]

Thierry,


Maybe, just maybe, after more than 50 posts on this, spending $30 and gaining Full Membership and thus being granted full access to do Joe Alexander’s excellent Linkage Tour in the Technical Manual would be a worth while expenditure at this point otherwise you are just going to keep going in circles


Garry
Membership Administrator

[Pawel66]

Spot on, Garry...

[Thierry du Laos]

I make a brake going to France and will start over when I come back from begining. Like drain the fuel tank.
Thanks for the time being!