D-jet idle - one issue thats not been solved, low idle on start up for a few minutes hot or cold...... Options

[DRPHIL914]

here is my set up, - its a '75 2.0 d-jet with very fresh and new in past 2 years everything,
,tested proper functioning AAr, CHT is the new 914rubberone, but same issue with my NOS one, no vac leaks , rebuilt throttle body MPS(ive tested 2 others one rebuilt by Jeff B same issue), etc etc , 123 distributor, anywayhere is what i have going on-

i think i am around 1000 for a good steady idle, if its lower than that warmed up, then i cant get it to idle decent when cold for the first 2-3 minutes, even with AAr open, same with a hot start after running for a while, then shut off and turned back on after sitting foor a few minutes, heat sink on the CHT maybe, i have a feeling the resistance of the CHT is not correct, it is a NOS correct CHT but i am thinking about adding that resistor to the cht line- any thoughts? i have to feather or hold the pedal down just a bit for a minute or 2 then it comes up.

like i said perfect idle around 950-1000 once on for a while or even stopped at light after running for a long time idle is perfect EXCEPT after turned off for a bit then back on--

Phil

[BeatNavy]

Phil, what are the specs on your engine? Is it bone stock 2.0 or did you bump to 2056 and if so what compression and cam?

I've had a Raby 9950 in a 2056 and a 2270 with CR around 8.6 and 9.0 respectively. On both builds I could never seem to get enough air on cold starts unless I completely yanked a vacuum hose off the plenum. After 2 minutes all is good. Never had an issue with hot starts though.

[DRPHIL914]

Phil, what are the specs on your engine? Is it bone stock 2.0 or did you bump to 2056 and if so what compression and cam?

I've had a Raby 9950 in a 2056 and a 2270 with CR around 8.6 and 9.0 respectively. On both builds I could never seem to get enough air on cold starts unless I completely yanked a vacuum hose off the plenum. After 2 minutes all is good. Never had an issue with hot starts though.

yea, its all stock as far as i know, none of the paperwork i acquired with the car 12 years ago indicated any engine work or build. so assume stock cam etc.
and while it has ok compression and leak down numbers , not perfect and its got 59k miles, so i am also starting to plan out what i would do next, either stock rebuild with new HAM heads and 2056 on the stock cam might bewithin the budget. my understanding is with Len's new worked heads, and new FI from PMB its possible to get a nice bump to 115hp on stock 1911 and 125-130 on the2056. so going forward thats in my thoughts,for about a year out- but for now this idle issue is like my last frontier of making this thing run as well as possible. With the 123 it runs great, smooth acceleration etc.