Holley Dominator EFI hard starting after warm up

[572Camaro]

I have been following this thread but am only familiar with FAST XFI systems.
Based on your hot start issue, i believe Andrew nailed your issue.
I would first ensure you have the specified fuel pressure with key on, engine off.
Then work on your "cranking fuel" which controls air/fuel ratio below roughly 400rpm.
Then IAC park position should be tuned to ensure it is opening enough.
Just curious, are you throttling the gas pedal during cranking to get it to start when it is hot? Does it help? That could be an indication that Andrew is on the right track.
Please let us know what you find out

[DOOM]

Originally Posted by 572Camaro

I have been following this thread but am only familiar with FAST XFI systems.
Based on your hot start issue, i believe Andrew nailed your issue.
I would first ensure you have the specified fuel pressure with key on, engine off.
Then work on your "cranking fuel" which controls air/fuel ratio below roughly 400rpm.
Then IAC park position should be tuned to ensure it is opening enough.
Just curious, are you throttling the gas pedal during cranking to get it to start when it is hot? Does it help? That could be an indication that Andrew is on the right track.
Please let us know what you find out

Will do ! Andrew is on the right track. I don't touch the pedal when I start it.

[572Camaro]

Hey DOOM, just curious..,
Any progress?
Just want to help and see if your "cranking fuel" adjustment fixed your hot start issue.

[DOOM]

Originally Posted by 572Camaro

Hey DOOM, just curious..,
Any progress?
Just want to help and see if your "cranking fuel" adjustment fixed your hot start issue.

We just got it all figured out! It turns out that my distributor is locked out. I don't have any mechanical advance on my car at all. So with that being said my car is trying to start at 38 digress total advance. Causing the starter kick back.MSD makes a Starter Saver that retards the timing 10 -20 digress . It works like a charm . We just literally got it done today !

[572Camaro]

DOOM, CONGRATULATIONS!!!!!

Time to cruise!

By the way, I shredded my starter and flexplate about two years ago in my 572
68 Camaro. Having accidentally too much timing advance during cranking, it backfired through the intake while cranking and destroyed several flexplate teeth. And of course, it had to happen at a car show with everybody watching.

Here's my point: You are lucky. I was not. I experimented with "cranking timing" and found 18 degrees advance to work the best for me.

Again, sincere congratulations!

[DOOM]

Originally Posted by 572Camaro

DOOM, CONGRATULATIONS!!!!!

Time to cruise!

By the way, I shredded my starter and flexplate about two years ago in my 572
68 Camaro. Having accidentally too much timing advance during cranking, it backfired through the intake while cranking and destroyed several flexplate teeth. And of course, it had to happen at a car show with everybody watching.

Here's my point: You are lucky. I was not. I experimented with "cranking timing" and found 18 degrees advance to work the best for me.

Again, sincere congratulations!

I actually had to replace the starter bolts on mine ! I knew this wasn't right so I would start the car by just bumping the ignition to help keep it from happening until we got it corrected.

[Tinker]

Originally Posted by DOOM

We just got it all figured out! It turns out that my distributor is locked out. I don't have any mechanical advance on my car at all. So with that being said my car is trying to start at 38 digress total advance. Causing the starter kick back.MSD makes a Starter Saver that retards the timing 10 -20 digress . It works like a charm . We just literally got it done today !

I personally have used the computer controlled timing going back to my old commander 950 setup in 2004. Simplifies everything ( once programmed) no other boxes needed. Heck, you already have a locked distributor. With my new HP setup I'm going to even go distributorless, and that's on an old Pontiac mill.

[DOOM]

I had no idea how this stuff works . I've been reading and learning more and more about what you can and can't do and it can be a tad bit overwhelming. Just wish I did it before I had the system installed I would have done a lot of things different that's for sure.

[andrewb70]

Mario,

The distributor is SUPPOSED to be locked out. The timing is handled by the ECU!!!

There is a place in the software where you can set timing while cranking...

Don't take this the wrong way, but please take your car to someone that knows EFI inside and out before something bad happens...

Andrew

[Tinker]

It's funny how after one is exposed to anything long enough, we tend to think of it as common knowledge, but that is certainly not the case. Good thing there is always something else out there to remind us. (And humble us). That is why we are all on this forum, for there is someone with experience out there to throw us a lifeline.