I have an issue with my car that I'm trying to sort out.

I haven't driven the car in a while since my last attempt at a dyno tune.
Long story short is I developed an oil leak on the front cover and shut down early.

The car runs great for the most part. I have a slight stumble/hesitation around 2K rpms under normal driving conditions.
This stumble isn't present when accelerating through it. Just when holding around that 2K mark. It bucks and stumbles.
I've tried tweaking my PFC, but that's a smaller issue right now.

The main issue I am trying to resolve is I have been starting to tune on WOT pulls.
I've only logged up to 5K RPMs at this point.

What happens is when I pull up to 5K at WOT, as soon as I let off the gas the car stalls/floods.
It takes a good 2 - 3 minutes to get it started again.

My map looks good. Fuel is pretty consistent across the spreadsheet.
I played with taking some fuel out on the vacuum/rpm range, but it seems like nothing will do the trick.
It was getting to the point where my fuel map looked way out of whack because of the amount of fuel I was taking out.

It only does this on hard pulls. If I slowly creep up to 5K and slowly back off the throttle there isn't an issue.

Any thoughts on where to look?

I've tested the TPS and the dashpot looks good.

Do you think this would be a mechanical/electrical issue, or a tuning issue?

Thanks for any help, Josh

 

Any thoughts or ideas?

 

Hard to say on that. May be worth resetting the PFC to defaults and driving around easy on the stock map, see if it does something similiar. Do you have larger than stock injectors? At higher duty cycle that injector could be dumping way too much fuel and flooding out the engine.

Dale

 

There is a setting for what rpm to start adding fuel after decel, I forgot what that setting is called but you might find that and bump it up.

 

Yes, I have 550 primaries and ID2000 secondaries.
I'm going to look into my high vacuum areas of the map a little more.

Is there a proper way to check that the injectors are operating correctly?

 

Thanks, I will look into that info tonight.