sixshooter

iTrader: (12)

When you first go out to the car and before cranking it, cycle the key from off to on position, wait two seconds, then turn off. Repeat 2 more times then try to crank it. If it cranks more easily, you need more fuel in your priming pulse and cranking pw settings.

If it is worse, next time after that, turn the key on then push the throttle flat on the floor and try to crank it. This will enable flood clear mode. If it cranks more easily you are getting too much fuel and need to reduce it.

nile13

Thanks, I'll try that!

Oddly enough, the car started OK before the race yesterday. Temperature was in low 60s in the morning, so I suspect my temperature theory to be correct. Any thought?

Erat

iTrader: (5)

I've never really had to start my car in sub 40F weather. But i noticed that i needed WAY more fuel than i thought when i was first tuning cold start. I'm upwards of 200% below 55F, with a pretty steep warmup enrichment. Maybe that's a bandaid to keep it running but it works for me.

Braineack

iTrader: (62)

did you even tune your cranking pulsewidth for colder weather?

nile13

Brain, are you asking me or Erat? My tune is on the previous page. Any changes that I should make?

Braineack

iTrader: (62)

you. did you tune your tune for cold starts? or did it just not work and you were like, i guess ill post online without actually attempting to solve it myself and hopefully someone can hold my hand and tell me how to tune an aftermarket ecu?

nile13

Ummm... Firstly, my tune was done by my dyno guy. I am trying to learn the details of MS tuning but relied on his expertise. He's no longer there and I'm having several issues I'm asking about.

Secondly, the problem I'm describing, which is constant crancking with no start in damp 80F+ weather is not likely related to cold starts, although I may very well be wrong, that's what I'm asking here and I truly appreciate all the help i can get.

As a quick update, I just went to the car. The outside temp is 63F, it's dry. I did what Sixshooter suggested above, which is 3 quick On-Off cycles. The car started pretty easily. But again, it was trying to start even before this procedure. What I was describing above was different - the car would crank forever and not even try to catch.