I have a 90 that just gave me the same type of problems. I could be driving
along and all of the sudden the car shifts into 2nd gear, rpm's go up and
the s light comes on. Sometimes it flashed on other times it came on and
stayed on for up to 1/2 hr at a time. The fix for me was a new trans
computer. It had a LED that stayed on all the time and that's what led the
mechanic to it. Just peel up the carpet on the passenger side and see if
that light is comming on.
He got me a computer at the junk yard for 100 bucks, a good deal I guess.

"frankg" <fg11@earthlink.net> wrote in message
news:0jdgov08qfm43hbkvi1a8n5jb6aiil7hfh@4ax.com...
> I'm noticing the "S" light indicator going on and off erratically (not
> steadily) at times on my 91 Accord (automatic transmission). Usually
> it will go on in the beginning of a trip and then usually go out and
> stay out for the remainder of a short trip. I did notice it shift
> differently when the light was on as opposed to off today. Also I've
> been noticing a slightly louder engine rpm's than normal for weeks
> thinking it was an exhaust leak till now. Assuming this all is a
> transmission problem, who is best to diagnose this (Honda dealer
> service dept as opposed to others). I'm not sure I can replicate the
> problem ( "S" light indicator) on cue for any shop when needed to.
>
> Any idea what transmission work costs today??
>
> Any ideas how best to approach this? I don't want to ignor it.