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The motor runs great above 3500 rpm and below 2500 rpm. But when i try to run at 2800 to 3000 rpms it just keeps surging from about 2500 to 3500. I have cleaned the vst filter, replaced the o2 sensor and changed the racor filter and the filter in the motor. I have also drained all of the gas from the tank and put new gas. I use ringfree. Please help. Thank you.
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Bluefin,
I'm not a mechanic or tech, just a 1998 250hp outboard owner with a similiar problem. After doing the same things you described in your post I determined I was having a cavitaion problem. A friend with the same motors as mine started experiencing the same problem after he changed the cup in his prop. My problem still exists because I haven't determined what's causing the cavitaion. Since hearing of my friends problem recently I'm going to change props and see if that changes anything. Good luck. -
I spoke with my mechanic today and he told me it might be the throttle postion sensor and suggested I change that out. I don't think it is a cavation problem as I have the same prop and haven't changed anything under the boat. Although, I did have that cavation problem when I went to the stainless steel prop (the shiney one) so I swithed back to the black stainless steel prop and that solved that problem. This is definately not a cavation problem - but thanks for the input.Comment
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Please keep me informed. The throttle position sensor wss never suggested to me. I'd like to know if it solves your problem.Comment
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Bluefin,
Did you try changing the throttle position sensor? I'd like to know if that's an option for me.Comment
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I changed the tps. The motor runs better, but I still have a rpm variation when I try to run at 2800 to 3000 rpm. I don't know what to try next.Comment
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for chance...did you test the low pressure pumps?Comment
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How do I go about doing that.Comment
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