"Pd7704" <brian.polson@greatwesternbank.com> wrote in
news:59c4eb02dc43b936bd198f0da587c629@localhost.ta lkaboutautos.com:

> I just posted a topic called my (90 accord idles rough when stopping),
> I drove the fuel down low and filled 3/4 up of Amoco ultimate or 92
> octane for those who don't know what Amoco ultimate is, now the
> problems seem to be gone is there a gas tank or fuel pump problem when
> the tank gets low has anyone heard of this before? read both articles
> to better understand please!!!! Any ideas????????
>
>

You know, when engines get old, they carbon up. The carbon takes space
in the combustion chamber so, your effective compression ratio is higher
than stock. What this means is some older engines require more octane to
keep from pinging. Are you hearing pinging when you accelerate hard
(with regular gas)? You also get carbon on the back of the intake valves
that absorbs some of the fuel injected into the engine making a lean
(too much air) mixture.

Dirty fuel injectors and induction system are the most common cause of
rough idle. Carbon buildup is next.

I'd run a can of BG44K through it and see what happens. That's what I
use anyway.

When's the last time you changed the fuel filter? Honda says change the
fuel filter when the car can't maintain normal fuel pressure. That means
a dirty filter makes the car run lean.