|
By the way; the lake or sea water temp has nothing to do with the engine performance.
|
FWIW my 454 mag looses about the same rpms if silent choice is set to silent (exhaust through the prop)--shooting it out the back lets it rev out. I agree that fuel pressure is the most likely issue, but if you have through-prop exhaust or mufflers make sure they aren't restricted.
|
Originally Posted by MER Performance
(Post 3812684)
You need to get a fuel pressure gauge on the fuel rail, and check fuel pressure. I have seen this happen before, the rpms will continue to get worse. I would replace both the low and high pressure pumps.
|
Originally Posted by MER Performance
(Post 3812684)
You need to get a fuel pressure gauge on the fuel rail, and check fuel pressure. I have seen this happen before, the rpms will continue to get worse. I would replace both the low and high pressure pumps.
|
Lake/Sea Temp is not used, there is no sensor for it and therefore it defaults at max temp. Has nothing to do with performance. I would put the 19 back on and see what it runs. I would also put a fuel psi gauge and check it.
The motor has fast burn "vortec" style heads therefore they do not use a lot of timing, especially with 87 octane. From a scan tool stand point, it looks normal so either your over propped, have a fuel delivery issue or ignition issue. |
hi guys, thanks a lot for the suggestions. I have since found the problem, a bad spark plug cable. Changed it and went right up to 4800.
Again, thanks! :party-smiley-048: |
Ha, that was gonna be my suggestion, either cable, coil or dead plug. Glad it was that simple....troubleshooting aside.
|
| All times are GMT -5. The time now is 11:15 PM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.