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Old 12-14-2018, 07:52 PM
Anewman9 Anewman9 is offline
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Boat: 1997 prostar 205
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losing power randomly 97' PS 205???

Hey everyone,

when I'm out on my boat ill be at WOT for a while with no issues. The moment I cut the throttle back (for a wake) and then try to get back at WOT it will only go to about 30% power even though the throttle is all the way open. If I put around for a minute or just idle for a few moments then try I can get back to max power like nothing happened....until the next time.

Any thoughts on why?

Thanks again for the help!
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Old 12-14-2018, 08:42 PM
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mikeg205 mikeg205 is offline
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Sounds like fuel delivery volume and or pressure. Have fuel pressure checked. Does this happen even with a full tank?

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Old 12-15-2018, 01:38 AM
waterskibrad waterskibrad is offline
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Boat: 1995 LT-1 prostar 190
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I put the wrong fuel pump on my 1995 LT1 190 had the same problem
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Old 12-15-2018, 01:43 PM
Anewman9 Anewman9 is offline
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Quote:
Originally Posted by mikeg205 View Post
Sounds like fuel delivery volume and or pressure. Have fuel pressure checked. Does this happen even with a full tank?

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Yes,

I haven't been able to isolate a good pattern as to when it happens vs doesn't. I did change the front fuel filter ( next to engine) and that didn't help. Perhaps the rear fuel filter above the tank is getting clogged up ?
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Old 12-15-2018, 09:54 PM
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mikeg205 mikeg205 is offline
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You maybe getting air in the fueline.. if you never replaced fuel line it may be time. I replaced mine when started getting fuel starvation.

I also had to seal up my fuel pickup and short fuel return tube in fuel cell.

A good way to tell is how your plugs look.

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Old 12-16-2018, 09:36 AM
Mtnmax Mtnmax is offline
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Check your distributor cap too. I've had some corosion cause this same problem. It's easy to do. Just pop the cap off without removing the plug wires and make sure all the contacts on the rotor and inside the cap are clean.
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  #7  
Old 12-16-2018, 10:29 AM
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Kweisner Kweisner is offline
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Boat: 2007 Prostar 197
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Quote:
Originally Posted by Anewman9 View Post
Yes,

I haven't been able to isolate a good pattern as to when it happens vs doesn't. I did change the front fuel filter ( next to engine) and that didn't help. Perhaps the rear fuel filter above the tank is getting clogged up ?
Had the same issue that was very intermittent. In my case, turned out to be oil pressure sender that was kind of wonky. So when the ECM sensed to low pressure, went to low power mode. I'd check oil level first and then the next time this occurs, look at your pressure gauge immediately and see if it's reading low. Mine was "bouncing" but it was enough to throw the warning to the ECM.
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Old 12-16-2018, 10:44 AM
88 PS190 88 PS190 is offline
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How long will she go WOT with out issues?

If you go wot 30 seconds back off and then hit it is there an issue? If not how long must you go wot before the issue will replicate?
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  #9  
Old 12-16-2018, 02:42 PM
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Thrall Thrall is offline
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More description needed.
And which engine?
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Old 12-16-2018, 06:01 PM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by Anewman9 View Post
Yes,

I haven't been able to isolate a good pattern as to when it happens vs doesn't. I did change the front fuel filter ( next to engine) and that didn't help. Perhaps the rear fuel filter above the tank is getting clogged up ?
Let's see the plugs - if they look good then we need to check the Coolant Temp Sensor (2 wires). These easily checked without spending a dime.

After that, you have a couple of options - but let's start here. The next time it happens pull off your spark arrestor. see if your injectors are spraying strong cones of fuel.

I assume this is a TBI 350?
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