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**WorkinLonghorn** · 06-26-2019, 03:46 PM

I think you will want to keep that EGR connected. With it connected you can run the stock timing or slightly advanced for optimal performance. With it disconnected or not working you will possibly get spark knock at standard advance setting. I've personally experienced this and then read about it. Talking about a stock truck. -BA

06-26-2019, 03:46 PM	#12
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: EGR valve testing I think you will want to keep that EGR connected. With it connected you can run the stock timing or slightly advanced for optimal performance. With it disconnected or not working you will possibly get spark knock at standard advance setting. I've personally experienced this and then read about it. Talking about a stock truck. -BA __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.