No let it cool down and let the fuel pressure equalize. Keep it off for a while first.

 

ahhhh that would make better sense . thanks

 

Where is your fuel pressure at? If the pressure has changed at all it could cause the a/f to jump around a bit.

 

Now I am also having fuel issues. I have a leak, a bad regulator or fuel pump because I can't keep pressure in the system after the car turns off and it is hard to start.

 

Sorry to hear that.

I also use AEM wideband air/fuel gauge. My idle is silky smooth.
The air fuel display flutuate a bit at idle, it's about 14.3 +/- 0.2 (14.1 to 14.5),
which I think it's normal since my idle rpm needle doesn't move.

The AEM digital display is a bit too sensitive.

 

mine did idle around there at first. so your's perfectly normal

Kpierson: you mean my fuel regulator? it's is under the passenger side rear bench. as for fuel pressure gauge i don't have one so i'm not sure if i'm loosing pressure.

ttrank: i'm sorry to hear that as well, i may be in the same boat.

when i have time i need to take out the pump and regulator to check it out. i wish my tuner was closer so i could just take it to him.

 

You really should put a guage on the regulator. Over time, from what I have seen, most regulators will drift a bit. If it drops down too far it could screw up your fuel trims (the OEM computer can only correct for so much, and the UTEC bases its corrections off of the OEM maps). You can pick up a cheap fuel guage for a couple of bucks. This is assuming you have an adjustable regulator!

 

My old fuel pressure regulator would drop pressure as soon as I turned off the car. It would start hard, sometimes, but I was running ~60 psi of fuel pressure. I swapped the regulator and lowered the pressure to 50psi.

The new regulator holds pressure after I turn the car off, and the car now starts much better.

 

Mine was turned down to ~38psi with my tune and that is where it sits now at idle. So far most people think it is the fuel pump. I'm going to try a new one of those first and go from there.

 

Quadcam had similar problems with his car, and it was his fuel pump. He ended up disconnecting his fuel line and pumping gas in to a bucket for a minute and calculated the rate of the pump. The rate was much lower then it should have been so he replaced the pump.

 

The stalling when decelerating after a hard run is a tuning issue. Get it retuned if you want it to go away.

 

how do i know if i have an adjustable fule regulator?

 

You would have a return fuel line. The FPR would be where the return line meets the supply line (most likely under the hood)