ZR-1 Net Registry Forums - View Single Post - 91 ZR-1 Cutting Out Under Load

GregCrowe · 08-21-2006

I hear ya' Tom. I wouldn't be surprised if my car still has the original OEM filter. I'll definitely change that and see what it does to my pressure.

As for O2 reading, yes they change rapidly and dramatically at idle and at cruise speed. At full throttle, they go up way high and should be somewhere around .750-.900 and stay in a certain range. That's how we tell how to adjust our adjustable fuel pressure regulators at the drag strip. On tuned port injection cars(I still have one with a Lingenfelter 383) the full throttle O2 readings should be around .760-.790. On LT-1 cars, optimal readings are around .860-.910. I just can't remember what ZR-1's are supposed to be.

Using these full throttle readings is how I discovered once on my ZR-1 that a little 5 cent clip had fallen off the right side secondary flap actuator. Without that actuator opening the secondary air flaps, the O2 senser readings on the right side went wacky.

08-21-2006	#22
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	Re: 91 ZR-1 Cutting Out Under Load I hear ya' Tom. I wouldn't be surprised if my car still has the original OEM filter. I'll definitely change that and see what it does to my pressure. As for O2 reading, yes they change rapidly and dramatically at idle and at cruise speed. At full throttle, they go up way high and should be somewhere around .750-.900 and stay in a certain range. That's how we tell how to adjust our adjustable fuel pressure regulators at the drag strip. On tuned port injection cars(I still have one with a Lingenfelter 383) the full throttle O2 readings should be around .760-.790. On LT-1 cars, optimal readings are around .860-.910. I just can't remember what ZR-1's are supposed to be. Using these full throttle readings is how I discovered once on my ZR-1 that a little 5 cent clip had fallen off the right side secondary flap actuator. Without that actuator opening the secondary air flaps, the O2 senser readings on the right side went wacky. Last edited by GregCrowe; 08-21-2006 at 01:01 PM.