MalibuMike
Petty Officer 2nd Class
- Joined
- Dec 29, 2020
- Messages
- 137
1997 Parker 2520 170 gallon gas tank all original. 2007 5.7 Volvo Penta Vortec intake fuel injected.
For months now I've been having trouble with bogging above 3200 rpm. Did all the usual stuff like cap, rotor, spark plugs, anti siphon valve, wiped the carbon from the throttle body, check the condition of the fuel line from tank to filter, ran on another portable tank ( same problem) etc. Also, fuel pump was newer when I purchased it and hi and low fuel pressure within spec. The bog would happen, then I'd back the throttle down, and then after 15 seconds, go right back to 3000 rpm without issue.
This led me to believe that there was a starvation issue of some kind.
We decide to try the spark arrestor first since it had oil around the breather area. Didn't look dirty but thought we'd pull it. When I removed the spark arrestor, the boat ran great! I ran all weekend with it off and no bogging.Even max rpms went up. So I took it home, cleaned it, and will test soon.
Next side issue was that I left my gas cap off and didn't know that some tree work and chipping was going to be done near my boat. Boat was covered in wood dust so I decided to rinse it off without seeing that the gas cap was off! Tons of water and wood debris went right down the side of the boat and in to the tank.
Called and friend and he said to install a Racor stat!
Installed and Racor filter in between the tank and oem fuel pump. Leaving the harbor it bogs down and out comes a cup of water and a ton of wood dust and really small bits of saw dust. Thinking the fuel pick up might be also getting clogged, I removed it so the Racor could grab the big stuff that might be in the tank. Wanting to get all debris out of the tank, then plan was to treat the 10 micron Racor as a disposable "polishing" filter and ran the tank almost dry to get as much out as possible.
Boat ran great all weekend and the Racor did a great job of getting the water and debris. Emptied it 5 times and after the first time, did not see any more water. A ton of junk was captured!
Now looking for advice. If the spark arrestor was restricting air then I likely solved the problem but it just hard to believe that it was dirty enough to cause a bog. Is there any other component that could have been getting affected by the amount of air being restricted? I have never pulled the IAC or the other sensor right next to it. I believe it is a throttle position sensor. I know I should next pull the spark plugs and look for a lean or rich condition. Any other advice?
For months now I've been having trouble with bogging above 3200 rpm. Did all the usual stuff like cap, rotor, spark plugs, anti siphon valve, wiped the carbon from the throttle body, check the condition of the fuel line from tank to filter, ran on another portable tank ( same problem) etc. Also, fuel pump was newer when I purchased it and hi and low fuel pressure within spec. The bog would happen, then I'd back the throttle down, and then after 15 seconds, go right back to 3000 rpm without issue.
This led me to believe that there was a starvation issue of some kind.
We decide to try the spark arrestor first since it had oil around the breather area. Didn't look dirty but thought we'd pull it. When I removed the spark arrestor, the boat ran great! I ran all weekend with it off and no bogging.Even max rpms went up. So I took it home, cleaned it, and will test soon.
Next side issue was that I left my gas cap off and didn't know that some tree work and chipping was going to be done near my boat. Boat was covered in wood dust so I decided to rinse it off without seeing that the gas cap was off! Tons of water and wood debris went right down the side of the boat and in to the tank.
Called and friend and he said to install a Racor stat!
Installed and Racor filter in between the tank and oem fuel pump. Leaving the harbor it bogs down and out comes a cup of water and a ton of wood dust and really small bits of saw dust. Thinking the fuel pick up might be also getting clogged, I removed it so the Racor could grab the big stuff that might be in the tank. Wanting to get all debris out of the tank, then plan was to treat the 10 micron Racor as a disposable "polishing" filter and ran the tank almost dry to get as much out as possible.
Boat ran great all weekend and the Racor did a great job of getting the water and debris. Emptied it 5 times and after the first time, did not see any more water. A ton of junk was captured!
Now looking for advice. If the spark arrestor was restricting air then I likely solved the problem but it just hard to believe that it was dirty enough to cause a bog. Is there any other component that could have been getting affected by the amount of air being restricted? I have never pulled the IAC or the other sensor right next to it. I believe it is a throttle position sensor. I know I should next pull the spark plugs and look for a lean or rich condition. Any other advice?
