CSV manual switch?
 

Hi folks,

Was thinking about a solution to my warm-start woes, and wanted your take on whether this is too hacky. Cold and hot, the car purrs (82 SC). Warm, it idles at almost nothing and smells heavily of gas for a few moments. I suspect the CSV is giving me un-needed fuel, and once its timer runs out it all returns to goodness.

I figure I can either rewire the thermoswitch so it engages at lower temperatures, or run a switch to the cockpit for the CSV. Much like the "choke" levers of old, I'd have control over if/when the CSV is activated at all.

What do you think? Any thoughts on the best way to get access to the tunnel from the back of the engine? Am I approaching this all entirely the wrong way?

I look forward to hearing your thoughts -

Babak


PS Just had the air/fuel set a couple weeks ago, and I don't have any vacuum leaks (though the decellerator is disconnected).

If in original OEM configuration CSV only operates while starter is turning. Look elsewhere for the problem most likely the WUR.

If the thermotime switch is still operating after the starter is disengaged, or if the CSV is leaking fuel, then you should replace these parts, rather than try to rewire the system to do something other than originally designed. Check your control pressures. As Jim said, the WUR is probably @ fault, although it could be themixture setting or the AAR.

Ahh, I just assumed that thermotime meant it was a temperature switch and a timer.

To check the thermotype I'd disconnect it and read its resistance while the engine is started?

CSV leaking fuel, how could I tell that apart from a running-rich situation? Think I could put a paper towel under the back of the engine and see if it stinks after a warm-start?

Thanks folks, hacking avoided-

Babak

Babak,

Make sure the engine is cooler than 45C. Remove the CSV but leave its fuel line and elec wiring in place. Disconnect the connection to the CDI. Have someone crank the engine while you aim the CSV into a clear plastic container. The CSV should spray a good cone shaped spray for something under 8 sec and stop. Wipe off the CSV. It should not leak for 1 min.

If the spray pattern is bad, replace the CSV. If dripping after, replace it. If no spray, replace the TTswitch after checking wiring. You can also check just the TTS by disconnecting the CSV and putting a test lamp onto the connections. The lamp should illuminate for up to 8 sec while cranking.

The Bentley Manual has full instructions on doing all this.