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Old 12-25-2012, 12:17 PM   #1 (permalink)
SmellyCat
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Join Date: May 2012
Location: United States
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Messing with Egr on 94 Volvo

I have been playing around with the vacuum lines using a vacuum gauge.
I plugged up some other vac lines that I did not need. I may have increased vacuum pressure to EGR.

With the vacuum gauge on

0 at idle ... egr off
6 psi on cruise, partial throttle
3 Psi while accelerating

When I'm cruising and the EGR line is at 6 psi ( Full Open). I can slowly play the throttle pedal, (Slight in or out) and the engine will start missing. After a second or two and the engine shows a burst of power. (like a turbo)

My theory is that the mixture is leaned ( Full Egr). The 02 sensor reads this and tells the injectors I need Fuel . Does that seem logical? Have I acheived a poor mans lean burn lean burn? Am I thinking wrong?.

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