DrBabyfood
New member
Hey guys,
So I've got a 1998 Volvo Penta 5.7GSi 57FCPBY that started idling around the 1800 rpm range. Background info: the boat was a gift from my father in law and he's always taken very good care of his toys. I took the boat out with my pops and it ran perfectly. We got to one area and noticed it seemed to be running a little rich however it didn't give us any problems and ran fine the rest of the day on the water. The next day, I hooked the water up to it to flush it out and upon cranking it I noticed the idle immediately started to increase up to around 1800 rpm.
I've checked the throttle cable and the physical mechanics of the throttle body and cleaned the throttle body as well. I noticed the IAC sensor wasn't connected nor was the knock sensor. I reconnected these and it didn't change the high idle. I've taken it to a mechanic to run diagnostics on it and he told me it wasn't throwing any error codes. He replaced the IAC sensor thinking it was that and the motor started to hunt from 800-1200 rpm. The mechanic thought he noticed an air leak around the throttle body gasket so he replaced those and it actually changed the idle back to the initial high idle problem. He then said he checked the IAC valve and it was in the correct position so he thinks the ECM is working because it's trying to slow down the idle.
The mechanic then looked at the timing and initially said it showed base timing and the motor was hunting between 800-1200 rpm. He replaced something in the distributor cap (module?) and rechecked the timing and it was working correctly. However, the motor then started to have a high pitched knock that he's never heard before. He's now telling me that it's probably something internal and I'll most likely have to replace the motor. I don't quite understand how the thing can go from working perfectly fine to idling high to then needing an engine replacement? Something doesn't quite make sense here. Or am I just in denial?
Anybody have any ideas what the problem could be?
So I've got a 1998 Volvo Penta 5.7GSi 57FCPBY that started idling around the 1800 rpm range. Background info: the boat was a gift from my father in law and he's always taken very good care of his toys. I took the boat out with my pops and it ran perfectly. We got to one area and noticed it seemed to be running a little rich however it didn't give us any problems and ran fine the rest of the day on the water. The next day, I hooked the water up to it to flush it out and upon cranking it I noticed the idle immediately started to increase up to around 1800 rpm.
I've checked the throttle cable and the physical mechanics of the throttle body and cleaned the throttle body as well. I noticed the IAC sensor wasn't connected nor was the knock sensor. I reconnected these and it didn't change the high idle. I've taken it to a mechanic to run diagnostics on it and he told me it wasn't throwing any error codes. He replaced the IAC sensor thinking it was that and the motor started to hunt from 800-1200 rpm. The mechanic thought he noticed an air leak around the throttle body gasket so he replaced those and it actually changed the idle back to the initial high idle problem. He then said he checked the IAC valve and it was in the correct position so he thinks the ECM is working because it's trying to slow down the idle.
The mechanic then looked at the timing and initially said it showed base timing and the motor was hunting between 800-1200 rpm. He replaced something in the distributor cap (module?) and rechecked the timing and it was working correctly. However, the motor then started to have a high pitched knock that he's never heard before. He's now telling me that it's probably something internal and I'll most likely have to replace the motor. I don't quite understand how the thing can go from working perfectly fine to idling high to then needing an engine replacement? Something doesn't quite make sense here. Or am I just in denial?
Anybody have any ideas what the problem could be?
