502 Lost Power acting like V6

[alldodge]

Quick history: 502 MPI wich has the VST canister pump.

Took the VST apart last winter and cleaned the filter. Running fine this spring until it got real hot then I had issue with vapor lock. Probably caused the vapor lock my self due to filling up last winter with winter mix and ethanol. Filled back up three weeks ago on the water with non-ethanol gas. No more vapor lock.

Two weeks ago it was slower gitting up on plane but not much, just enough to notice.

This week, it barely managed to get on plane going out and could not get on plane coming back in. Managed to turn 2900 RPM and 13 MPH at WOT. Engine did not mis at idle or all the way to 2900 RPM. The boat just does not have any power. Change the fuel filter this morning and it had no effect.

 

[Bondo]

Re: 502 Lost Power acting like V6

Quick history: 502 MPI wich has the VST canister pump.

Took the VST apart last winter and cleaned the filter. Running fine this spring until it got real hot then I had issue with vapor lock. Probably caused the vapor lock my self due to filling up last winter with winter mix and ethanol. Filled back up three weeks ago on the water with non-ethanol gas. No more vapor lock.

Two weeks ago it was slower gitting up on plane but not much, just enough to notice.

This week, it barely managed to get on plane going out and could not get on plane coming back in. Managed to turn 2900 RPM and 13 MPH at WOT. Engine did not mis at idle or all the way to 2900 RPM. The boat just does not have any power. Change the fuel filter this morning and it had no effect.

Ayuh,... Time to plug it into a diagnostic 'puter,....

When was it's last tune up of hard parts,..??

Look for carbon trackin' in the cap,..??

Spark plug color, 'n condition,..??

 

[alldodge]

Re: 502 Lost Power acting like V6

Ayuh,... Time to plug it into a diagnostic 'puter,....

When was it's last tune up of hard parts,..??

Look for carbon trackin' in the cap,..??

Spark plug color, 'n condition,..??

Replaced the plugs, rotor, cap etc last year. Your probably right it needs to be plugged into a computer. The weird thing is it does seam to mis at all, just no power. Hope it's not bad gas, found two others which said they are having trouble after filling up at the same place I did. Plan to take it to the dealer tomorrow if nothing comes up.

Thanks