Holley Pro-jection problems

[sigepkat]

I've got a buddy w/a 70 that the PO installed a Holley Pro-jection 2d that has worked fine for the last few years. As of a few months ago, it started having starting issues when the engine was hot. It'll fire right up w/a cold motor, but after driving for a bit, it won't start until it's cooled down some. The fuel pressure is good, all of the sensors seem to be working correctly, but once it's hot, the starter just cranks and nothing happens. Any thoughts on where to look for a fix?

Thanks
CM

 

[welndmn]

Check the basics first, did it lose fuel or spark of both?
Those units were known to fry PCM's for any number of reasons, but they are very basic.

 

[Blue Bastard]

^^^^beat me to the question^^^

Have you verified that it is indeed a fuel delivery problem? Kind of sounds like it could be a coil that is getting hot and inoperable thus making a spark issue.

 

[sigepkat]

Spark is there (weak, but present), fuel pressure is right around 15 psi which is what the system calls for...

 

[Broncobowsher]

Lack of fuel or flooding out?

 

[demesauce]

Sounds like the fuel is vaporizing. Mine did that. I wrapped the fuel line in heat wrap near any heat source i.e. Headers/exhaust

 

[DirtDonk]

Spark is there (weak, but present)...

Well that's not a good sign right there. A "weak" spark will give you all kinds of trouble. Especially when trying to light off a leaner mixture, which would be what the injection is delivering once warmed up.
So while it might still be a fuel problem... It's sounding like spark is still a possible culprit.

After all, "99% of fuel delivery problems are ignition related" as Dr Jacobs used to say.

Paul

 

[WheelHorse]

Bright blue spark man, that's what you're after.