"84 Corvette Crossfire w/Renegade takes inordinate amount of cranking to cold start. Warm starts are immediate and if I pour a bit of gas down each TB when cold, it starts right up. Have Dynamic EFI EBL ECM... What should I be adjusting/looking for, thanks.

 

So threads are telling me to check FP... Looks good turns on for two seconds then drops and getting TBI pulsing while cranking. Since it starts nicely with a little extra manually "injected" fuel I'm thinking whatever controls that initial squirt needs to get jacked... Here's my tables - suggestions on which one and how much? Thanks.

 

... or maybe one of these.

 

Skip the choke tables, they are after-start fuel.

Have you checked the fuel pressure? It needs to be between 9 & 13 psi, the higher end is better. And once cranking is the fuel pressure OK?

Can play with the prime PW, but since it is a one shot deal, need to have fuel pressure at first crank. So if you key-on, wait for the pump to turn off, no prime fuel will be injected.

Leave the PW multiplier table alone, that is for the crank to run transition.

Which leaves the crank AFR table. They are the actual cAFR values. So lower is more fuel.

RBob.

 

Thanks for response. FP is there @ ~ 20 psi. I jacked the prime PW way up and made sure I didn't hesitate cranking. It started in a couple of seconds a major improvement. So it's one or the other. I know what to mess with now - thanks again.

 

If you'd like I can send over a copy of my renegade bin. Regardless when cold it takes a second to crank but then snaps right off. Even stock it did this, takes a bit for the fuel to reach the runner. At least gives you something to compare to.

 

Thanks - please send.

 

I don't know if RBob has issues or not with bin sharing via forum link but if so I'll remove it. Be warned there are some odd things done for my particular build... but they work for me. I'd use only as a comparison tool.

 

Thanks but can't open it ... still trying

 

Weird. It should just download as a regular EBL bin.

 

Got it, for some reason my desktop picked it up as a ZIP file and refused to unzip it. Moved to laptop and no issues. Our Prime PW's are very close after I adjusted mine, I must have made some good guesses. Starts fine now, cold. Will compare some other things for kicks.. Thanks. BTW I'm running a 383 stroker with 90# injectors, you? What did you dyno?

 

That's odd, my tables are exactly like yours as posted and mine starts just fine, every motor is a little different on settings to make them run properly. GL.

 

80 lb/hr 26 psi. dynoed about 350/350 to the tire. Stock bottom end 350. My AE is off, goes lean on shifts. Being you have an auto I'd imagine it wouldn't be as big of a deal though. I do get an occasional hard hot start. Seems to be a tad lean, bumping the throttle while cranking usually gets it going if it does it. I could probably close my minimum idle to fix it. My idle IAC steps are about 15 and should probably be closer to 25 I think.

 

Yep, not sure why higher Prime PW's did it but it is working consistently better now. May be masking another issue.... Hard to tell with CFI...

 

350/350 nice!

 

Thank you. It's pretty ridiculous in a good way. It's plenty for me and more than enough to catch most passengers off guard lol.

 

There is a hot restart function that opens the IAC further and adds fuel. May need to tweak the temperature point to have it kick in.

RBob.

 

Will do. It's an odd window where it does it. Like if I stall on a hot restart its a little tricky to get going sometimes... if I pull up to a wawa and run in to grab something real quick sometimes it restarts fine sometimes I get a long crank. I don't see anything glaring in datalogs where I try to duplicate it, it just seems to happen when sitting longer than 3 minutes and less than 10. ECT, IAT don't seem to really matter... I will look at that though.