280ZWarrior Posted June 20, 2006 Author Share #13 Posted June 20, 2006 I'm wondering about the BCDD myself lately ( as in do you really need that?)Never heard of that before. I did a search for it and it seems like it could be part of my rpm problem. However, I haven't found anything on adusting it...sblake01-Do you have any further knowledge of adjusting the BCDD??Thanks in advance,Mike Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171702 Share on other sites More sharing options...
TomoHawk Posted June 20, 2006 Share #14 Posted June 20, 2006 the BCDD (Boost-Controlled Deceleration Device) injects a little air when you let off the gas pedal to prevent a cloud of smoke coming out the tailpipe. It is electronically controlled, and can't be adjusted. Maybe it can be disconnected & removed, but I don't know if it would affect the way the engine runs. I suppose if it leaked air, it might raise the RPM. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171710 Share on other sites More sharing options...
Grim Posted June 21, 2006 Share #15 Posted June 21, 2006 I said it was oncars with manual trannies only becouse that is what the factory service manual said. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171734 Share on other sites More sharing options...
sblake01 Posted June 21, 2006 Share #16 Posted June 21, 2006 Grim, I stand corrected. I just did some reading. FSM, page ET-3. Manual transmission only. But, one more correction: Tomohawk, the BCDD can be adjusted. See page EC-7 & EC-8 in the FSM. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171740 Share on other sites More sharing options...
DatsunZsRule Posted June 21, 2006 Share #17 Posted June 21, 2006 Also under "Engine Tune Up" in the FSM look at page ET-9 It does say (Manual Transmission Models Only) for Dash Pot Adj. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171743 Share on other sites More sharing options...
sblake01 Posted June 21, 2006 Share #18 Posted June 21, 2006 What makes this all seem rather strange is that the original post is about an automatic car that was converted to a manual. And it has the dashpot and hence my original statement. The FSM says manual trans only for the dashpot, but my 'junkyard research' says that that is not true. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171746 Share on other sites More sharing options...
280ZWarrior Posted June 21, 2006 Author Share #19 Posted June 21, 2006 Grim, I stand corrected. I just did some reading. FSM, page ET-3. Manual transmission only. But, one more correction: Tomohawk, the BCDD can be adjusted. See page EC-7 & EC-8 in the FSM.If the instructions from the FSM aren't too long for the adjustment of the BCDD, could you post them? I am still in the process of finding a '78 FSM at a reasonable price and only have the chilton manual.Thanks again,Mike Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171756 Share on other sites More sharing options...
Grim Posted June 21, 2006 Share #20 Posted June 21, 2006 I have never been around an automatic z so I didn't know the part was on them as well. I'll have to make a note in the manual. Could save on questions some day. I can't think of any reason why the idle would be different. Just a guess but could the auto tranny just drag the motor down slightly? Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171757 Share on other sites More sharing options...
sblake01 Posted June 21, 2006 Share #21 Posted June 21, 2006 It took me a while to get it together but here it is: Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171766 Share on other sites More sharing options...
DatsunZsRule Posted June 22, 2006 Share #22 Posted June 22, 2006 The rare times I've seen Automatic 280Z's do not have the Dash Pot and the Factory Service Manual is not going to lie either so I have to agree it's got to be on Manuals only. If your Automatic models have it then possibly the previous owners did some parts swapping from a manual model? My guess anyways.Also the B.C.D.D. on an automatic model is different from a manual model. I can't remember if the adjustment procedure is the same. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171850 Share on other sites More sharing options...
sblake01 Posted June 22, 2006 Share #23 Posted June 22, 2006 The service manual is not going to lie? Well, I don't think it's lying but there are many inconsistencies when you deal with these cars. Take a look at these two scans, both from FSM's. One makes no mention of transmission type and the other does. Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171854 Share on other sites More sharing options...
DatsunZsRule Posted June 22, 2006 Share #24 Posted June 22, 2006 Yeah, I hear ya. They sure don't make it clear do they? Well, we know it's purpose and how to adjust it if necessary I guess thats all that counts Link to comment https://www.classiczcars.com/topic/20478-what-is-this-and-what-does-it-do/?page=2#findComment-171860 Share on other sites More sharing options...
Wilbur
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