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Forum: S-Series Tech 08-27-2010, 11:49 AM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

The FSM describes the pending codes staying in history (with the SES light OFF) so a programmed number of engine cycles without the same error coming back will reset the history. Some error codes...
Forum: S-Series Tech 08-26-2010, 07:30 PM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

I'm sure you mean P0401 (easy to transpose numbers) and I have what may be considered another reason for the egr valve code being separate from the clogged catcon; many here with definite clogged...
Forum: S-Series Tech 08-25-2010, 06:33 PM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

Here's a partial reprint from the FSM;

EGR System Operation
The exhaust gas recirculation (EGR) system is used to decrease the emission levels of oxides of nitrogen (NOX). NOX is a group of...
Forum: S-Series Tech 08-25-2010, 08:29 AM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

I beg to differ here. How does the overall air fuel mixture become richer when exhaust gases are deliberately ported in during acceleration and cruise? If the O2 sensor is operating correctly and...
Forum: S-Series Tech 08-20-2010, 06:28 PM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

Here's a reprint from the FSM for your car.
Forum: S-Series Tech 08-20-2010, 05:50 PM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

Too many people become overly concerned about gunk/grease/oil/carbon deposits inside the intake manifold. Its there because of positive crankcase ventilation, the pcv that recirculates combustion...
Forum: S-Series Tech 08-20-2010, 02:55 AM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

HUH? Any exhaust flow back into the engine simply leans out mixtures, not richens it. How can it be possible to richen air/fuel mixtures when exhaust gases are already combustion byproducts?
...
Forum: S-Series Tech 07-26-2010, 04:57 PM
Replies: 33
Views: 33,228
Posted By fdryer
Re: Jerky Saturn problem narrowed down to EGR valve. What next?

None of the sensors directly affect egr valve operation. All sensors output their signals to the pcm that controls the egr valve and uses the egr valve's feedback position sensor within it to tell...
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