Sounds like it might be a throttle position sensor or an O2 sensor.
Either one could give the FI computer funky reading that will make it do
stupid things to the injector timing (which controls the fuel-air mix).
Matt Trebelhorn wrote:
>
> Quick intro: I've been on and off the MG list for over 10 years; an MG
> owner for over 15. Also experience with Jags, alfas, fiats, and a
> sunbeam.
>
> I have, more or less by accident, a 1991 Toyota Camry with FI and a
> slushbox. It's my first experience with FI, auto transmissions, and
> japanese cars in general; so I find myself at a bit of a loss at times.
>
> It's a reasonably good car, but I'm looking for some advice because it
> hesitates or stutters at times -- mostly noticeable at low speed and
> low throttle openings, when it drops in to top gear. It will stutter
> a little if I don't press on the gas enough to kick down a cog.
>
> Anyway, I don't even know if this is a motor problem or a transmission
> problem. It isn't temp dependent (car temp or ambient) as far as I
> can tell, except that when the car is really cold (below freezing,
> the first half-mile or so from a cold start) it won't shift in to top
> gear. But the stutter can still happen in those circumstances, just
> not in top gear.
>
> I can think of a few dozen things it might be, but I would just be
> taking a shot in the dark. Any number of sensors in the FI loop, some
> of the voodoo inside the transmission, maybe even something as simple
> as a cable adjustment. But I have no idea where to begin. The haynes
> manual isn't particularly helpful, as far as I can tell. I've sprayed
> some carb/injector cleaner stuff on the throttle body, and I gave it a
> basic tuneup over a year ago (k/n af, fuel filter,
> cap/rotor/plugs/wires.) It has 240,000 miles on it.
>
> Any ideas/suggestions? Thanks,
> M.
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