1998 Volvo/OMC - When shifting to forward, the motor stalls. It runs fine on muffs.

Bill4452

Cadet
Joined
Aug 31, 2023
Messages
21
1998 Volvo Penta 5.7 - model 57FCPBYC, serial number T01311023.
When starting and running the motor on muffs in the driveway, the engine runs ok. As soon as you put it in the water and shift to forward the motor stalls. It will restart and running it in neutral is not problem. I can rev the motor to 1500 rpm with no issue. The cylinder compression runs from 185 thru 174 on all eight of the cylinders. Checked and there is no water in the fuel/water separator filter. Marina had it for three weeks and couldn't figure it out. Have scheduled a second marina to look at it. New Plugs, wires and cap have been installed. IAC and TPS have been replaced.
 

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
13,241
Does it stall in reverse as well? Will it shift into gear without stalling when on land running on the water hose?
If it's suspected that the outdrive is locking up it could be removed, and water could be fed to the raw water pump to run the engine with the drive removed.
A dock line wrapped around a prop shaft can stall a 200 hp 4.3 at idle so it doesn't take much.
 

Bill4452

Cadet
Joined
Aug 31, 2023
Messages
21
Does it stall in reverse as well? Will it shift into gear without stalling when on land running on the water hose?
If it's suspected that the outdrive is locking up it could be removed, and water could be fed to the raw water pump to run the engine with the drive removed.
A dock line wrapped around a prop shaft can stall a 200 hp 4.3 at idle so it doesn't take much.
It didn't stall on land when running on hose and shifted to forward
. I didn't rev it to high (Maybe 1,000 rpm). I can check reverse tonight.
 

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
13,241
I'm wondering if you're getting water in the cyls when launching the boat....
 
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