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Discussion Starter · #1 ·
Caprice tbi 5.0 obd codes 13, 32, 42, 43, 44, 54

All at once.

I'm thinking that it is the old EGR control solenoid.

I'm very experienced and don't want to chase sensors and wires needle$$ly.

Any learned opinions?
 

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Discussion Starter · #2 ·
The egr control solenoid may be sticking open, causing a loss of vacuum. Vacuum loss messes with the HVAC airflow, air/fuel ratio, o2 sensor; probably causing the rush of codes.

I'll be back with the results, when the valve arrives.
 

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Discussion Starter · #3 ·
Font Rectangle Fashion accessory Metal Gun accessory


Here is the culprit's replacement.

The thirty years old pulse width modulation valve had been cleaned and had It's filter changed, but had given it's last reliable vacuum signal. As it begins to cycle just above idle, the plunger stuck open and provided for strange performance issues, and of course, the dreaded rapid flash of the check engine light.

Naturally, the issues began after the addition of a Chevrolet Performance intake along with Vortec heads from an L30. To further complicate the situation, the Air Injection Reactor was removed and it's passages fitted with plugs except for one; used for EGR feed.

Wanna race!

No, but at a given stoplight . . .
Like the LED lights in all the sockets?
 
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