Ive logged alot of hours reading thirdgen trying to figure this out. You guys seem to have the best info and have been a great help so far.

This is a 383 with a 7747 computer, basically stock cam, stock throttle body and injectors. Ive been playing for about two weeks with tunerpro.

It runs good except that when its cold (25 and below) it ticks on startup until about 150 coolant temp. It goes away entirely once warm. Its not mechanical in that the engine is new, made the ticking noise, tore it apart found nothing wrong, put it back together. Then the original computer took a dump. Replaced the computer, still made the noise.

But here is why I placed it in diy prom. When in LHM it doesnt make the noise, not even remotely. So Ive been playing with the emulator and I reduced the main spark advance tables down low and it helped a little.
I also zeroed out the egr table and the coolant temp advance table also.

What am I missing? The base timing is about 12 degrees low load and total is 41 low load and 35 full load. Ive had similar carbed motors on my engine dyno and with those heads and such thats where they did well.

Danny

 

Any knock retard going on in logs?

Base at dist equals initial timing advance?

Ticking is not the injectors making the noise?

Rockers adjusted correctly?

Base at dist equals initial timing advance?

 

Ha I figured it out. The idle air control valve. When I change the IAC to CTS value down from 160 to 19 throughout the noise goes away. Idle is a little slow at initial fire up, but goes up in about 15-20 seconds.

 

I presume 160 is max extension of pindle in .bin. maybe your IAC only allows 150 due to crud? Try a power was of the IAC pathway and IAC but direct the dsolvvents so as not to getr solvent into the IAC motor. Or try 50-130 steps. You may need more steps on cold start.