Yes , I have tried to rev the engine but the steering is still stiff . The new pump is OEM. My old pump was not but the issue is the same on both pumps .The only time it feels a little better is when I first start the car and drive after a few minutes it gets stiff again.i did check the rack myself this week and notice the the two return lines have a small leak . Looks like the nuts where not screwed in all the way . Would that cause a problem? When I first clean the reservoir I notice that When I pulled the return lines off to clean the reservoir they did not have any oil in them .