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Message: [QUOTE="mikeeg02, post: 1488113, member: 24194"] Just some crazy ideas from left field. Tuning; I know when I had a srp1.1 pump, the tuner did some tricks to limit the ipr so to eliminate spikes. So effectively I believe they changed how quickly it would ramp the ipr changes. Is it possible that when your at WOT, full load and when you let off your oil pump is at full rpm, and your ipr goes to full open to relieve pressure, but now your oil pump has almost no restriction and is literally still pumping as fast as it can (because the rpms are still coming down) and thats sucking up the low pressure oil? Two scenarios 1) Full load, WOT, 4400RPM, ICP 3800, IPR 40% The IPR is still required to restrict flow, to maintain pressure. lets say with that restriction to make that pressure the pump is capable of 100 gallons per hour at that rpm. 2) Let off, truck is coasting, no pulse width, truck is maintaining 600 PSI, IPR is set to 1% (whatever minimum is) pump has almost no restriction, and the same pump with no restriction coming down from 4400 rpm is capable of 200 gph. Now youve sucked all the low pressure oil, and maybe some air? Truck comes down to needing to apply pulse width to idle again, there could be air in the system, or it could need to command the ipr to increase pressure. One way to test this crazy theory, next time you run down the track, AS SOON as you let off, put it in neutral and let it fall to idle immediately. Or put it in neutral and give it some throttle to keep rpms at 1500-2000 rpms as soon as you let off. I bet keeping rpms up under power and not coasting will keep it running and let low pressure oil stay up? [/QUOTE]