CSV, WRD,,,, wtf. Engine bogs down until warmed up.

[jf308]

OK.  64 230SL.  New wires, dizzy cap, plugs.   Starts up nicely, and idles at about 800 when cold (40 on temp gauge).  Kind of a lopey, lurchy idle -- but it idles.  Throttle it and it feels pretty rough initially.

If you try to drive off BEFORE temp gauge hits 60, the car feels like it is really loaded up. Missing.  At times almost seems like its gonna flood out and stall.
Push it above 3000 rpm and it smooths a bit.

When warm, needle above 60, the idle elevates to 900 then 1000, and the boggy feeling upon acceleration stops.  Still detect a bit of a burble as you accelerate, but once warm seems to run very well.  Not silky smooth, but pretty good running.  Might need a slight tweak by the mechanic.

Other factors noted:

Dwell/timing was set by German Auto mechanic.  Idle was smooth at the time, but the engine was allowed to warm up.

After steam cleaning.  CSV now leaks out of top of solenoid.  SO, I removed the positive wire and in theory disabled the CSV.
(I have not tested it yet to see if it is still pushing fuel -- eg. valve stuck open.)


Not sure what might be the culprit of early loading up....  Unsure of what the WRD actually does and at what temp, etc.    Thoughts/comments appreciated.

Thank you.  John

[ctaylor738]

There is a huge amount of information about the Won't Run Device on the site.  I'll summarize by saying that (when working) it causes the engine to get extra fuel and air during warm up.  It does this with a thermostat controlling a slide valve that allows the extra air and fuel when the coolant temp is cold and then reduces it as the engine warms up so that at about 160 degrees the extra fuel and air stops.

There is a longer description in the technical manual.

I think the slide valve in your WRD device it stuck at or near the warmed-up position, meaning no extra fuel/air during warm-up.  Again, in summary the fix is to clamp the two hoses off and disconnect them, remove the WRD from the pump, take it apart, free up the slide, put it back together, and test it.  Try a Search, there are many posts on this procedure.

[jf308]

Just had the car out for a spin.... 50 degrees and the top down.   Once warm....performed magnificently. 

Sounds like the Won't Run Device to me.  Will take a crack at it over the weekend.

THANKS.

J.

[Jordan]

John, as you will read if you do a search it is very easy to test to see if your WRD is working without removing it.  Remove the air filter on the WRD (you'll need a thin wrench) and start the car when cold.  Hold your finger over the hole where you unscrewed the air filter.  You should feel a strong suction, enough to hold you finger there, and you should probably hear a response from the engine as well.  As the engine warms up the suction will decrease until it is gone when the engine has reached operating temperature.  If you don't feel this then your WRD is not working and you will need to remove it to get the slide/valve working properly.

[jf308]

Thanks Jordan.

Had the car out today at Cars and Coffee.... once warmed, it was absolutely fantastic.  Love this car.

Will test WRD tomorrow

John

[ja17]

If you learn the "Split Linkage Test" you can tell us if the car is running rich or lean while it is warming up. We then can point you in the right direction.

[Shvegel]

Try removing the air filter on top of the injection pump and see how it runs especially if this started after steal cleaning the engine.  I have seen the filter collapse and the filter material partially clog the auxiliary air flow. Warm or cold "shouldn't" effect the cold start valve. It is supplied fuel regardless. 

[ja17]

If the solenoid is leaking at the CSV (on the intake). You still may be leaking fuel into the engine even with the wire dis-connected. Remove the small hex screw on the side to see if fuel emerges. If so it is leaking. Fix this first if so. Otherwise go back to the WRD (at the injection pump) to resolve a rich running cold engine situation. Check the air intake at the small filter as mentioned.  Make sure the linkages are correct first. (linkage tour). Do you know how to perform the split linkage test?

[jf308]

Hi Joe

I have looked thru the Linkage Tour, but have not done yet.

Not exactly sure how to do the Split Linkage test --- if that is written up in detail on the tour, I will look it up.  Otherwise, I guess I would have to say that I do not know how.

Thx.  John