Hello Guys,
I hope you can give me some advice on the next thing to look for with the motor I have. Here is the problem. It starts up fine, idles at 1200rpm (I know it's very high), but cannot ajust it down. Quickly snap it in gears, stills idles high. As soon as I rev it up, it sputters and cuts out on me.
I've cleaned the VST tank and filter thoroughly and also the clear tank filter before the mechanical fuel pump also, all injectors sprays fine, electric fuel pump works fine, fuel rail pressure is 38-40psi. All coils produce consistent sparks, new sensor pressure, all wires are checked and retaped tightly, fuel injectors were cleaned out, no bad seals, check all sensors, fuel regulator (no fuel in vacuum line)...
The only thing I noticed is when I do a terminal test with key off or completely out of the control, I saw spark at the battery terminals when touching the terminal wires to the battery. Can it be the key ignition switch short that causes this problem? Or some other short on the boat? All Yamaha dealers and mechanics will say: "it's a fuel issue, check fuel pressure, clean/replace VST filter, fuel water seperator, etc...
To me, this is more of an electrical problem so I am checking to see if ya'll have any unique advice from your experience with this motor.
Tomorrow, I will replace the key ignition switch and will test the main relay, and will post back the result when done. But I hope one or more of you can help with an advice from your experience.
Thanks and regards,
HQ
I hope you can give me some advice on the next thing to look for with the motor I have. Here is the problem. It starts up fine, idles at 1200rpm (I know it's very high), but cannot ajust it down. Quickly snap it in gears, stills idles high. As soon as I rev it up, it sputters and cuts out on me.
I've cleaned the VST tank and filter thoroughly and also the clear tank filter before the mechanical fuel pump also, all injectors sprays fine, electric fuel pump works fine, fuel rail pressure is 38-40psi. All coils produce consistent sparks, new sensor pressure, all wires are checked and retaped tightly, fuel injectors were cleaned out, no bad seals, check all sensors, fuel regulator (no fuel in vacuum line)...
The only thing I noticed is when I do a terminal test with key off or completely out of the control, I saw spark at the battery terminals when touching the terminal wires to the battery. Can it be the key ignition switch short that causes this problem? Or some other short on the boat? All Yamaha dealers and mechanics will say: "it's a fuel issue, check fuel pressure, clean/replace VST filter, fuel water seperator, etc...
To me, this is more of an electrical problem so I am checking to see if ya'll have any unique advice from your experience with this motor.
Tomorrow, I will replace the key ignition switch and will test the main relay, and will post back the result when done. But I hope one or more of you can help with an advice from your experience.
Thanks and regards,
HQ