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454 Mag MPI limits to 4100rpms lost 8mph too!
Two months ago I was hitting the rev limiter easily, I haven't pushed the boat very hard at all, the last two weeks it's been limiting at 4100 mph, and I lost 8 mph. Nothing has been changed in the last two months. Seems a "lil" slugish, actually it's drives just like when I had my 3 blade out of the hole. Rams right up to 5100 when not in gear. I checked for off vacuum hoses and all plugs look good. Could it be a injector issue?
1998 454 MPI MAG 300HRS 24 hydro QIV 4800lbs |
Doe sit actually feel like its hitting the rev limiter???? or just doesn't have the power to pull past 4100rpms????
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I can't really tell, there is no mis-firing, nothing else seems to be wrong, the fuel pump is 1 yrs old, so I don't think that is the issue. It just climbs up and hits a wall.
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The rev limiter feels like a constant miss. You would definately feel it.
I would just do a basic tune up or at least start by changing the fuel filter and inspecting everything else. Also, check the timing. |
Nah, this feels like everything is perfect but just won't go above 4100, and it's ALWAYS 4100. I figured if it was a partial clogged injector, it would skip around a lil bit, but it doesn't.
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4100mph is fukin flying man....how much faster you need to go?
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Originally Posted by Shorgasm
(Post 3182999)
4100mph is fukin flying man....how much faster you need to go?
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I'm still having the same issue, I am stuck, I ramp up to 4100rpms and it just sits there, I'm stuck at around 57-58mph.
Beginning of the season I was hitting 5200rpms and 63-64mph. Here is the break down: Leak Down Test: good Compression Test: good Injectors working: good Injectors getting volt: good ECM: good Plugs (brand new): good Cap/Rotor (brand new): good Throttle body opening: good All wires to correct cylinders on cap: good Fuel Pressure: Good Could it be my drive? I don't know where else to look! This SUXS X 10!!! |
Check the fuel pressure.
Its not going to be the drive. |
I forgot to add that, but yes it's good.
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