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-   -   500 EFI Backfire and drops rpm in rough water (https://www.offshoreonly.com/forums/general-q/277856-500-efi-backfire-drops-rpm-rough-water.html)

GoFastSonic 09-02-2012 05:01 PM


Originally Posted by 4bus (Post 3767240)
Have you scanned it to check for codes?

No codes @ the dock lol

stlliberator 09-02-2012 10:13 PM

Have you checked the water seperator filters?? I know I have had issues with my carb motor when getting in the rough water it bounces around and water gets back into the fuel..I change the filter and were good to go..

Steel Outlawed 09-03-2012 11:17 AM

I had the same issues with my 500 efi's. It drove me crazy for a whole year. It would run good sometimes then out of the blue it would start running bad. Come to find out I had to wires loose in the iginition system. One of the plugs that plugs into the coil was bad and one that plug into the control module on the distributor was bad. The way I found it was wiggling all the wires till I found the one that made it mis-fire. The engine runs perfect now that I changed those 2 plugs. NAPA had both of them in stock.

GoFastSonic 09-03-2012 11:51 AM


Originally Posted by Steel Outlawed (Post 3768046)
I had the same issues with my 500 efi's. It drove me crazy for a whole year. It would run good sometimes then out of the blue it would start running bad. Come to find out I had to wires loose in the iginition system. One of the plugs that plugs into the coil was bad and one that plug into the control module on the distributor was bad. The way I found it was wiggling all the wires till I found the one that made it mis-fire. The engine runs perfect now that I changed those 2 plugs. NAPA had both of them in stock.

Thanks
I'm thinking next step will b uNplug every connector and check fur corrosion


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