Cornnuttz
Recruit
- Joined
- Sep 4, 2018
- Messages
- 5
My 2000 crownline 202BR backfires @ high rpm. I can only run it @ about 90% throttle around 4K rpms. Anything more than that & it backfires through tbi. If I’m sitting still in the water u can go full throttle without problems until it reaches 4K or so. If I go easy I can walk it up to 4200 but not more. It has 5.7 throttle body injection & bravo 3 duo. Things I’ve done so far
new- cap, rotor, plugs, wires, ignition module.
Boat shop checked timing it was @ 16deg supposed to be @ 8 so they set that ( I think it started a little easier @ 16)
the problem has been been unaffected by any of this. Is my next step a compression & leak down test & would these tell me anything since the problem is only @ high rpm? I’ve been told that it might be a bad valve spring by shade tree mechanic friends.
Thanks
new- cap, rotor, plugs, wires, ignition module.
Boat shop checked timing it was @ 16deg supposed to be @ 8 so they set that ( I think it started a little easier @ 16)
the problem has been been unaffected by any of this. Is my next step a compression & leak down test & would these tell me anything since the problem is only @ high rpm? I’ve been told that it might be a bad valve spring by shade tree mechanic friends.
Thanks
You may need to get a hold of a tee-piece and put it in the line. Putting a gauge at the point you're indicating in your photo will only tell you how much of a pressure drop you're getting between the tank and the filter. No use to finding the fuel pump pressure.....