Fox Car want crank back up after idling.

[nickyb]

Just rebuilt a 93 Mustang G.T, hatchback. we put a 351 Windsor motor in it brand new, everything is brand new. Transmission TKX. It has an Aces EFI fuel injection on it. Got car running it was over heating so got a new radiator (3 row aluminum)and had it tooned. Seems to have fixed the heating issue while sitting at ideal. The only issue I'm facing now is car after idling does not want to fire right back up. It turnes over but want run as if the motor needs to cool Down. But its not running hot on the guage. I'm at a losse right now and can't figure it out. Has anyone ran into this and or what steps would you take.

Sometimes when you get them tooned they act like goofey.

 

[FastDriver]

Sorry if I missed anything, but it sounds like this is EFI. If so, what size injectors are you running? Often the tune calls for a certain pulsewidth on cranking that would be MUCH higher with stock 19 lbs injectors than with, say 60 lbs/hr injectors. So, if you're running EFI and have larger injectors, or a ty tune, this could totally mess you up when trying to crank while warm Cold engines like more fuel. Warm engines may not cranch at all in those conditions. You can try flooring it (if using the stock EEC), and it'll choke the fuel and clear up any flooding issue, giving it a better chance of igniting.

I've been kinda obsessed with tuning, lately. So, that's where my mind takes me.

 

[LILCBRA]

Sorry if I missed anything, but it sounds like this is EFI. If so, what size injectors are you running? Often the tune calls for a certain pulsewidth on cranking that would be MUCH higher with stock 19 lbs injectors than with, say 60 lbs/hr injectors. So, if you're running EFI and have larger injectors, or a ty tune, this could totally mess you up when trying to crank while warm Cold engines like more fuel. Warm engines may not cranch at all in those conditions. You can try flooring it (if using the stock EEC), and it'll choke the fuel and clear up any flooding issue, giving it a better chance of igniting.

I've been kinda obsessed with tuning, lately. So, that's where my mind takes me.

It is fuel injected, but it's throttle body injection, not port. It's the same system I just installed in my Cobra II. It has (4) 100# injectors and is supposed to be self-learning.

From what I can gather from their posts, it's a slow crank when warm but is fine when cold starting. It also sounds like it's not firing when warm, which - to me - sounds like either a lack of fuel (which, if I understand correctly, isn't a problem before it's shut down) or a spark issue. In either case, though, it sounds like a heat related issue. It wouldn't necessarily hurt to try the flood clear start and see what happens. I had a bit of an issue with that when I first got my car running with the system and had to do it. The problem in my case was that I wouldn't try starting the car until after the injectors fired the initial pulse which then, obviously, flooded the engine.

 

[FastDriver]

Never seen self-learning on crank pulsewidths. Not saying it doesn't have that, just haven't seen it.

 

[Noobz347]

I've read through this briefly...

It sounds like you're running lean. Do you have the ability to measure lambda/AFR?

You said it yourself... "HOT HOT HOT".


Have you ever opened the hood at night after running it?

Are the headers glowing?