Griff

No ECM on a 525SC to scan.

Check all the basics. About teh only thing all three engines should have in common are the fuel tank supply and the grounds.

Being that its happening in turns, it could be a wire or wires that are chaffed. It also sounds a lot like what my 525SC did when I had water in fuel. Take a water sep filter off and dump it into a glass container. Wait an hour and look for separation. Fuel will be on top and water on the bottom.

louielouie2003

thanks bro I tried that and gas seems to look good I have ran about 250 gallons through the tank while having this problem, it will run perfect for about 45 minutes then starts acting up. I really appericiate the information. I have only had stock 454's and no nothing about these blower motors and Im about sick of them.

louielouie2003

where can I get the crane hi6m ignition and bout how much does it cost

gordon1243

Try searching on here for them. alot of good info. it might be a good idea if you have one of the motors that is not acting up to try and swap the ignition box with one of the others. its a small black box with i think two square connectors on it that bolts behind the mounting plate at the top left back corner of each engine. kinda fun to try and change if you dont have much room. the crane boxs will be hard to find right now as they are shut down and were hard to get when they were open. lastly dont put out the fuel problem yet. they are very sensitive to bad fuel. i pulled my hair out with this for several weeks and like you said they run fine when your not in the water....same with mine but im glad i only had two and not three...

Griff

There is really not much different on the 525SC's than on regular 454's. The 525SC's are great engines, and I doubt the problem is specific to them being 525SC's.

Probably none out there to be had right now. Crane is closed down for a while.