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Old 07-26-2006, 06:47   #1 (permalink)
Gearheadus Maximus
 
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Join Date: May 2006
Location: Omaha NE
Age: 48
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Troubleshooting The EGR System - 91 Sable 3.8L

Greetings!

My poor Sable has been experiencing a lack of power for some time.

I'm starting to diagnose the EGR system in the car.

I'm curious as to the EGR Vacuum Regulator (PFE EGR system) and how
it works... I've done some research on the Internet to the system and
the EVR in general.

All the research I've done, talks about if the valve holds too much vacuum
and won't release.

Nothing I've found says anything about if it doesn't hold vacuum at all.

I disconnected the vacuum line from the EGR valve, and with the engine
running and at full operating temp, I connected the EGR line to a vacuum
gauge.

There was no vacuum at all on the EGR line, but when I ran the throttle up
to about 2500/3000 RPM (going by ear here), there was still no vacuum on
the EGR line.

Shouldn't there be vacuum on the line if the engine is revving?

Or are there other conditions that need to be met before the EVR will open
and supply vacuum?

Does it sound like the EVR is bad?

Thanks!
Scott
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Old 07-26-2006, 07:20   #2 (permalink)
Gearheadus Maximus
 
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Location: Omaha NE
Age: 48
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Re: Troubleshooting The EGR System - 91 Sable 3.8L

I just thought of something after I made my original post...

Since the system is a feedback system, and I disconnected the line to the
EGR valve, I opened the closed feedback loop.

I'll have to retest the system tonight after putting the vacuum gauge in the
EGR valve vacuum line with a "T" fitting to keep the system closed.

Does this sound correct?

Thanks!
Scott
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