For those with a wide band A/F gauge [Archive]

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mt_goat

12-13-2007, 04:06 PM

When idling have you ever noticed a fluctuation in the A/F when stepping on the brake? Mine will settle nicely around 14.7 then when I step on the brake it instantly shoots up to about 15.5 or so, then it over-corrects to about 14 then resettles on 14.7. Then when I release the brake it fluctuates all over again.

I'm guessing its from a change in the vac pressure (due to the brake booster) effecting the URD FTC pressure sensor.

MTL_4runner

12-14-2007, 03:46 PM

I'm guessing its from a change in the vac pressure (due to the brake booster) effecting the URD FTC pressure sensor.

I don't have one, but I am sure you're seeing the temporary effect of the vacuum booster.

mt_goat

12-15-2007, 08:02 AM

Thanks Jamie, there must be a lot of air flow from that booster.