Cold start choke - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Cold start choke by doc_oc on 26 Nov, 2007 08:37
• I am not sure how to use it and what does it do? Can anyone educate me please?
  
  And if, I drive the car for about 40 minutes till I realize I forgot to push it back in, is there a problem?
  
  Thanks.
• #1 by burn_your_money on 26 Nov, 2007 10:58
• It advances the timing and raises the RPM. I always just leave mine out. The timing advance is overriden at 2200 RPM IIRC
• #2 by doc_oc on 26 Nov, 2007 11:13
• Mine seems to be starting better with it in the cold but the RPM is not moddified at all. Cold or warm.
• #3 by lyeinyoureye on 26 Nov, 2007 11:46
• Quote from: "burn_your_money"

  It advances the timing and raises the RPM. I always just leave mine out. The timing advance is overriden at 2200 RPM IIRC

  Ya know, I just figured something out. In all their charts, Bosch never uses exact figures because the high idle/etc can all be set to different things. For instance, on a stock pump designed to rev to 5k rpm, it looks like the advance of ~2.5 degrees would start increasing again w/ the CS out after 2200rpm like ya said, but if the pump only revs to 4k rpm, or up to 6k rpm, because of the lower or higher high idle, then the KSB timing cuts out at a proportionally lower or higher engine speed.