Rich Idle $12p 304

[seanlivingstone]

Hey All! Having trouble getting a 304 thats on $12p that we have in to idle at a decent afr, just want to make sure im not missing anything in the tune or i should be chasing something mechanical. Has 0280155968 injectors, timing has been checked and has 28* on idle. Just cant get it to idle at anything less then 11.0 and if i do really lean out the idle part of the VE table it runs away lean and stalls. It also cranks slow when hot so im leaning towards a bad coil or similar! I have attached a few photos and the tune. Thanks in advance as this ones really doing my head in

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vq rich idle.bin

[immortality]

Hi,

What are the engine specs/combo?

[seanlivingstone]

Pretty basic 304, hydraulic roller, 223/221 112lsa camshaft, Holley mid rise manifold with Holley 4150 throttle body with ls style iac

[immortality]

Why 28° timing at idle? Try taking some out.

[seanlivingstone]

Tried that, made it stall. I think it’s going to be a spark issue! Just too weak on idle or something

[brindo]

28 degrees is up there.
Does the timing match up with a timing light?
And cam timing right? Or is the compression stock?

[vlad01]

28 is nothing unusual, a larger cam than stock can be anywhere from 24-32 deg from what I have seen and experienced, especially with stock or lower comp than the cam actually wants, results in even higher timing.

If it wants 28, give it 28. Brindo has a point, the timing could be offset due to the dizzy or something. Not uncommon on any engine that runs a dizzy for EFI, but still, 28 is not crazy by any means.

[seanlivingstone]

Have checked static timing with diagnostic mode and is at 10°, but haven’t checked it with it out of diagnostic mode so could be doing something weird I guess! Not sure on cam timing or compression, car come just for a tune (always the case) and it’s doing all types of weird shit only on idle, was just trying to rule out something in the tune that I might have missed as the flu has kicked my ass the last couple of days and I’m not thinking straight

[delcowizzid]

Have you set kinjflow for the 42lb injectors and are they genuine its very hard to find genuine ones

[antus]

Also could be injector dead times are wrong. That'll be most noticable at short pulse widths.