98 Camry--EGR insufficient

I have 98 Camry w/ 70k miles. CEL came on 2 days ago. Went to Auto Zone
for free diagnostic, which displayed "EGR Insufficiency."

The CEL came on immediately after a gas station attendant put in
premium when I had asked for regular. This may be a silly question, but
could this cause such a reading?

Also: can anyone tell me where I find the EGR and how difficult it is
to remove and clean?

What tests can be done to pin down problem?

If the EGR itself is bad, is it expensive?

Are there any other possible causes of problem?

Thanks.


--
ravgil
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"ravgil" <ravgil.1r5fup@no-mx.forums.yourdomain.com.au> wrote in message
news:ravgil.1r5fup@no-mx.forums.yourdomain.com.au...[color=blue]
>
> I have 98 Camry w/ 70k miles. CEL came on 2 days ago. Went to Auto Zone
> for free diagnostic, which displayed "EGR Insufficiency."
>
> The CEL came on immediately after a gas station attendant put in
> premium when I had asked for regular. This may be a silly question, but
> could this cause such a reading?
>[/color]

No.
[color=blue]
> Also: can anyone tell me where I find the EGR and how difficult it is
> to remove and clean?[/color]

The EGR (Exhaust Gas Recirculation) valve is in between the exhaust and
intake manifolds.
The check engine light can come on if the EGR valve is stuck closed or
partially open; if there is insufficient vacuum to the EGR valve (vacuum
leak, bad vacuum switching valve or bad vacuum control valve); if the EGR
gas temp sensor or gas temp sensor circuit is bad.
[color=blue]
>
> What tests can be done to pin down problem?[/color]

Rap the EGR valve with the handle of a screwdriver to see if it frees up,
install a vacuum gauge, and trouble shoot the EGR gas temp sensor circuit.
[color=blue]
>
> If the EGR itself is bad, is it expensive?[/color]

Probably in the $150 or so range.[color=blue]
>
> Are there any other possible causes of problem?[/color]

See above.

--
Ray O
correct the return address punctuation to reply