TaTommyWS6

Anyone else have this problem?

I have GM's hotcam, my own tune via LS1Edit (VE Table scale<1200 by 60%, stock RPM, etc...)

When I first start my car, if I stall it out (ex. backing out of the driveway while engine is still cold on a Spec III clutch) it is almost impossible to restart. It just cranks and cranks and does not fire up. If I let it sit for 20-30 seconds, try restarting, it works fine..... I'm wondering what this is all about?

Is there yet another open loop table it uses under these conditions? Why would I have to wait 30 seconds, and then it works fine....

It's no big deal, because it happens rarely...

Any insights?

Tommy

felton316

Yep, I have the same problem after my cam install. The only solution I have found so far is to not stall the car..... I'm thinking that it has to be some type of fueling problem.

TaTommyWS6

Cool, it's good to know it is not some bazaar problem only I have!

Maybe someone else will chime in.

Tommy

Speed Demon

iTrader: (14)

I have the same problem.
I thought it may have to do with my TR6 (colder) spark plugs.

It acts like a flooded carbed car if you stall it cold.
Any suggestions, other than not stalling it.

samz28

gotta tune more. When i got my A4 back from the works the tune was great when hot but not so great, after a few more cold days, the tuner got it down pretty good, gotta go pick it up tonight and will see..

TaTommyWS6

There may be a way to get the tune better, but I think you have to experience this exact problem to understand. My car starts fine, idles fine, etc.. etc... Not sure what to try next...

taqwache

i got the same problem. i already drilled TB and got IAC counts to 55 when hot. after driveing around for a while it will just start to die and surge. then when it dies, it will not start up right away. this also happen after my cam install. it is a 238 duration at .050 any sujestions?

samz28

probably warm start fuel enrichment table in ls1edit

jimmyblue

iTrader: (11)

Try holding the pedal all the way down and use
the "flood clearing mode" when cranking?

samz28

that doesn't work, best to part throttle it to 1500rpm's.

spent a week tuned like this, on A4, its not fun.

TaTommyWS6

I have Version 1.21 of LS1Edit and I do not see any "warm start fuel enrichment" table...

Tommy

felton316

I have Version 1.3 of LS1Edit and its not in there either...

WS6snake-eater

I've got the same problem

jrdz28

ttt same boat cold = rich

TaTommyWS6

Well, I did have me VE table scaled at 60% from 400-1200 rpms.

I changes it to 60% at 400, 80% at 800, and 90% at 1200.

It idles rock solid when I first start it now, much better than just 60% 400-1200. When I perform my usual morning ritual of backing out of driveway in the cold NY weather, it idles so well, that it does not seem like it wants to stall at all anymore (the rpms used to drop and surge a bit when snapping off the clutch pedal fast).

Anyway, I just thought I'd mention this since we can't seem to figure out how to "fix" the restart problem, maybe better idle tuning is the key for now.

Tommy

Slowhawk

iTrader: (12)

yes,it's all in the idle area tuning/timing.Also cranking VE affects cold starting.

NoGo

iTrader: (2)

As you found out, it is the VE table that is causing your problem. It gets worse with bigger cams.

You have match your VE properly. You can do this by a little guesswork (like you did) and calculation for best results.

Good Luck

Bink

On startup the injectors all fire at once ( two bursts I believe) to provide enrichment - before a single cylinder fires.
I once had my start up fueling screwed up badly ...because I kept smelling gas/fuel! I continued to lean it out...No start. Lean it out a little more ....No Start. I went to the books and realized I was smelling the uburnt enrichment fuel. Increased fuel (VE/IFR) and it started right up. FWIW.

joel