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From: TOM on 26 Oct 2008 20:05
TOM wrote:
> For a few months, my '88 Toyota Pickup with a 22R engine and 4-speed
> trans, has had a slight hesitation above about 50 MPH in high gear. The
> same hesitation is there at lower speeds in lower gears, which leads me
> to believe it's an ignition problem. If I'm going up a slight hill,
> there's no hesitation, so it sounds like it's related to vacuum. Is it
> possible there's a broken wire in the distributor that momentarily
> looses connection at a certain vacuum level?
>
> This hasn't been a real problem since I drive less than 100 miles per
> week and seldom drive at freeway speeds.
>
> I'm thinking of replacing the distributor, to the tune of around $160.00
> for parts.
>
> I have a mandatory smog test coming up at the end of October, so am
> thinking I'll see how it goes. If it fails, I'll replace the distributor
> and have it retested.
>
> I had thought, at first, that it may be fuel related, but have pretty
> much ruled that out since it's fine at wider throttle openings. It has a
> fairly new fuel pump and the filter has been replaced. It ran fine after
> those changes, and started the hesitation a few months later.
>
> Any help would be appreciated...

I bought a replacement EGR Vacuum Modulator (Solenoid) from
autopartsway.com. I installed it yesterday (10/25). It seems to have
cured the problem. The original unit was mechanically OK, or so it
seemed, but the filter inside was a mass of carbon. It hasn't been
opened or cleaned in over 20 years (187,000 miles), so probably deserved
a rest.

Thanks to everyone who responded to my question...
--
Tom - Vista, CA
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