johnhibbs
New Member
I finally found the problem with my Challenger with the 240EFI M2 engine. I either replaced, cleaned or inspected almost everything on the engine except the ECU and control unit. While out on the water and monitoring the fuel pressure my son noticed that one of the exhaust hoses expanded like a ballon just when the rpm dropped.
I took off the hose and looked inside. The inside wall had delaminated and a huge blister had formed. Since both water and exhaust flow thru the hose the water was probably filling the blister and blocking the exhaust. I then check the other hose and it had the same problem. I replaced both hoses with www.tridentmarine.com wet exhaust hoses and the boat runs like a jet ski now. I was in a hurry so I didn't order the Seadoo hose but it would be a lot easier to install.
The hoes may look fine on the outside but the inside may be coming apart. If the hose feels soft at the bend it's probably bad. If you idle the engine and hold the hose at the bend you can feel something vibrating inside. This hose was the cause of a Seadoo recall related to salt water spray on the throttle.
Attached are some photos of the bad hoses. I cut them open so you can see the problem better.
I took off the hose and looked inside. The inside wall had delaminated and a huge blister had formed. Since both water and exhaust flow thru the hose the water was probably filling the blister and blocking the exhaust. I then check the other hose and it had the same problem. I replaced both hoses with www.tridentmarine.com wet exhaust hoses and the boat runs like a jet ski now. I was in a hurry so I didn't order the Seadoo hose but it would be a lot easier to install.
The hoes may look fine on the outside but the inside may be coming apart. If the hose feels soft at the bend it's probably bad. If you idle the engine and hold the hose at the bend you can feel something vibrating inside. This hose was the cause of a Seadoo recall related to salt water spray on the throttle.
Attached are some photos of the bad hoses. I cut them open so you can see the problem better.
