EFIDynoTuning Forum

Michael-

Did a data log tonight.

New wires with resistance checked, new Motorcraft plugs gapped at .050".

You probably don't remember but we had a "bog" or hesitation of some kind around 4K or so last time and couldn't figure it out Anyway, it's much worse now.

You'll see it in the datalog.

I can send you a pic of my air intake if you think you want to see that.

Whatever you need but it's a very noticeable "lack of power" in the rpm band then it takes off fine and accelerates like a bandit to redline just like it does from idle to this rpm band.

Brian

Correct, didn't touch the fuel

Put another 40 miles on it today. Runs good till I hit the pedal hard. I watched the AFR carefully and at appr 4200rpms it bogs and the wide band reads over 15.2:1. Seemed to do it once, catch itself and then do it again above 4500rpm. Fugly!

I know nothing about tuning this system but it sure seems that lack of fuel could be causing that "bog" or whatever you want to call it. I don't notice it as much when it's not under a real load when doing a quick 2 sec burnout on my bridge tonight.

Are you able to see the bog in the datalog I sent?

I ran a fuel pressure check and it stayed at the (on my gauge) 38-39#'s up thru 5,000rpm.

I left you a couple more texts and a brief voice mail.

Another note-

2 different things going on???

1- When I pin to WOT I get the bog in 2nd gear for datalogs.

2- When I accelerate more gradually through that same rpm range I do not get any bog and my fuel psi gauge does not waver either time.

Just info- I have not touched my FP regulator and I had 6.5" of vacuum at idle with my old cam and I now have almost 9.5" at idle and I am at appr 38-39 psi when I turn the key on prior to starting.

I sent a long text today, Wed, 7-30-23. Please read it.

Very nice looks like 92uego is what the wideband matches at WOT from what you said about the 15.2 afr and what the narrowband showed as well.

She looks excellent just the maf needed some corrections up top where you couldn't reach before.

This should make her significantly happier.