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From: dave.mcc on 13 Sep 2008 19:41
Yes, that device you're describing is the EGR modulator. I've taken
it apart and cleaned that filter you were talking about - no doubt
that was at least part of the problem with your vehicle. I don't
think it was the problem with mine, although perhaps having the EGR
valve plugged might have contributed to my problem.

One thing I did was take apart (very carefully) the AFM (air flow
meter) - it's an air flow measuring device just after the air
cleaner. I scraped off the silicone sealing the plastic top on the
unit and popped off the cover. With a Q-tip and some contact cleaner,
I very carefully cleaned the contact surface, reasoning that if the
computer wasn't getting the right information about the amount of air
coming into the engine it wouldn't send the right amount of fuel to
get the right mixture and hence the hesitation I was describing. And
my problem seemed to always be related to where I had the accelerator
and what the RPM of the engine was.

So far, so good. Everything is working fine now. The real test will
be if it lasts because this has been an intermittent problem for a
couple of years now.

>> On my 1988 pickup with the 22R engine, there was another
> vacuum device (valve?) that had vacuum lines going to the
> EGR valve.  It had a plastic cover that could be popped off
> for the purpose of cleaning the "filter elements"
> underneath.  There was kind of a fuzzball, synthetic fiber
> blob (let me know if I'm being too technical here...), and
> another disk-like white-ish filter less than a mm thick.  I
> carefully blew the dust out of the blob with a gentle blast
> from an air nozzle, and blew off the disk as best I could.
> The disk had one small area of heavy, black deposit on one
> side, right over a small port in the valve.  When I
> reassembled it all, I rotated the disk so that the blackened
> spot was about 180 degrees away from the port.  After
> reassembly, my old beast simply amazed me!  Gone was the
> difficulty in starting, and the tendency to die right after
> starting.  It's only been warm weather since doing this, but
> so far, also gone is the occaisional stumble on drive-away.
> And most surprising to me, the clutch chatter that had been
> plagueing this truck for a couple of years, has much
> subsided (I think because the torque on drive-away is
> smoother, and more muscular).  And the first two full tanks
> of gas have produced mileage of just a hair over 25 MPG, up
> from an average of about 23.5.
>
> It sounds like you have the shop manual available.  That's
> where I got the clue about this filter.
>
> Hope this helps.
>
> --
> croy- Hide quoted text -
>
> - Show quoted text -

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