Bogging after Coasting - ZR-1 Net Registry Forums

Dmod81 · 01-10-2016

I'm still having the problem with bogging on throttle after coasting. This started after I had the intake ported and removed the secondaries. It seems to not happen until the car gets hot (fully warmed up in the 190s). What happens is when I let off the throttle and coast, the o2s read full rich. When I get back on the throttle, they go to full lean and the car feels like it has no power and bucks. After a few seconds of that, it starts to clear up and drive normally.

Everything seems to check out. I've replaced the pumps (was getting instant leak down), fuel filter, o2s twice (though it might have been the issue), coils (I had a miss that the first set fixed, I thought maybe one was breaking up under heat. Second set had no change), wires, plugs twice, injectors (manual pointed to a slight leak after pumps replaced. FICs installed now), tps, iac, full exhaust (old exhaust had many leaks from bad welds and was kludged together).

Could it be that dfco is not enabled? Or an ECM problem?

01-10-2016	#1
Dmod81 Join Date: Mar 2010 Location: Colorado Springs CO Posts: 76	Bogging after Coasting I'm still having the problem with bogging on throttle after coasting. This started after I had the intake ported and removed the secondaries. It seems to not happen until the car gets hot (fully warmed up in the 190s). What happens is when I let off the throttle and coast, the o2s read full rich. When I get back on the throttle, they go to full lean and the car feels like it has no power and bucks. After a few seconds of that, it starts to clear up and drive normally. Everything seems to check out. I've replaced the pumps (was getting instant leak down), fuel filter, o2s twice (though it might have been the issue), coils (I had a miss that the first set fixed, I thought maybe one was breaking up under heat. Second set had no change), wires, plugs twice, injectors (manual pointed to a slight leak after pumps replaced. FICs installed now), tps, iac, full exhaust (old exhaust had many leaks from bad welds and was kludged together). Could it be that dfco is not enabled? Or an ECM problem?