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]

Going over 300 is not an issue especially with hard driving. I understand north of 350 regularly may be cause for attention. Pushing or exceeding 400 not good.

On my 2056 I was D-Jet. On my 2270 I'm Microsquirt with an idle air control valve. On both I have the Raby cam, and, as mentioned, first start of the day requires a few blips of the throttle. I think I've heard others say the same thing.

I hadn't heard about PMB's FI solution. I need to check that out.

[ClayPerrine]

On both I have the Raby cam, and, as mentioned, first start of the day requires a few blips of the throttle. I think I've heard others say the same thing.

Betty's 914 has a Raby 9590 cam in it, and it won't idle at all when it is dead cold. The AAR is working correctly, but it just won't idle (This is L-Jet, btw). After about 2 minutes of blipping the throttle, it will idle. But the extra performance of the 9590 cam is worth the extra trouble when cold.

I think it is something to do with the cam profile.

Clay