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  #1  
Old 05-05-2012, 07:46 PM
David4MCSammyDuvall David4MCSammyDuvall is offline
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Engine Coughs when I go faster....

Need your help to figure out how to pinpoint the problem.....
I replaced the gas. Put a new fresh gas.
Poured the "gas treatment" in the tank.
Replaced the fuel filter.
The engine is still coughing when I drive my boat faster....
And I can smell the gas in the air.....
Does that means I need to replace the fuel pump ?!?
Or carburetor ?
My boat is 1995 MasterCraft ProStar 190 with a Corvette engine.
Your suggestions are appreciated.
Thanks.
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  #2  
Old 05-05-2012, 09:56 PM
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JimN JimN is offline
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Quote:
Originally Posted by David4MCSammyDuvall View Post
Need your help to figure out how to pinpoint the problem.....
I replaced the gas. Put a new fresh gas.
Poured the "gas treatment" in the tank.
Replaced the fuel filter.
The engine is still coughing when I drive my boat faster....
And I can smell the gas in the air.....
Does that means I need to replace the fuel pump ?!?
Or carburetor ?
My boat is 1995 MasterCraft ProStar 190 with a Corvette engine.
Your suggestions are appreciated.
Thanks.
First, you don't have a carb- you have a throttle body and each cylinder has its own injector. If you smell gas in the exhaust, check the coolant temperature sensor and scan for codes. If you see 14 or 15, replace it but I would check it first. The resistance should be in the 2K Ohm range is the air/coolant temperature is near 70 degrees. The one you want to check has two wires- one yellow and one black.

Here's a link to the temperature/resistance values-
http://shbox.com/1/4th_gen_tech2.html

If this checks OK, make sure the thermostats are good and the raw water impeller is good, the oil cooler is clear and you have good water flow through the cooling system.
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  #3  
Old 05-09-2012, 02:16 PM
David4MCSammyDuvall David4MCSammyDuvall is offline
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JimN...
No offense intended. I'm not following you. Can you explain what is causing my engine to "cough" when I tried to go faster ?
I suspect that it has something to do with the flow of the gas to the engine, since I can smell the gas in the air.
My boat runs just fine in the "Idle" speed. No coughing at all.
But when I go faster in about 40 mph, it started to cough.
Hope I explain it clear of the problem....
Thanks.
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  #4  
Old 05-09-2012, 02:24 PM
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SilviaMan SilviaMan is offline
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He is thinking your engine is over fueling, the coolant temp sensor helps control how much fuel your engine gets.
Information is king when diagnosing a problem. It costs nothing to check that part out and report back.
- Is your issue, on the very top end it coughs. Like you pull your hole shot and speed down the lake and when you get to 40 mph you have the problem?
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Old 05-09-2012, 03:54 PM
David4MCSammyDuvall David4MCSammyDuvall is offline
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SilviaMan...
I get what you're saying....Thanks.
So my next question is... How do I check that part ? The coolant temp sensor ? Where is that ? I'm not a boat mechanic by all means.... But I'm enjoying learning how to fix my boat.
My favorite thing is a picture of the engine... with the instruction how to check... It helps me to understand because I don't have the "boat mechanic" language yet. Pretend that you're teaching a lady how to fix the boat engine. :-)
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  #6  
Old 05-09-2012, 04:31 PM
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pmkkdx pmkkdx is offline
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Quote:
Originally Posted by David4MCSammyDuvall View Post
SilviaMan...
I get what you're saying....Thanks.
So my next question is... How do I check that part ? The coolant temp sensor ? Where is that ? I'm not a boat mechanic by all means.... But I'm enjoying learning how to fix my boat.
My favorite thing is a picture of the engine... with the instruction how to check... It helps me to understand because I don't have the "boat mechanic" language yet. Pretend that you're teaching a lady how to fix the boat engine. :-)
is she cute?
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Old 05-09-2012, 04:31 PM
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pmkkdx pmkkdx is offline
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cause if not, she can call a mechanic
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Old 05-09-2012, 04:58 PM
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SilviaMan SilviaMan is offline
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Originally Posted by pmkkdx View Post
cause if not, she can call a mechanic
mmm. hmmm.
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  #9  
Old 05-09-2012, 05:03 PM
BoulderX45 BoulderX45 is offline
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Spark Plugs....When was the last time you replaced the plugs? Gas smell? Maybe a issue with the plugs.....
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  #10  
Old 05-09-2012, 06:19 PM
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Drodey Drodey is offline
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I am with Boulder on this one...I have an 02 prostar that had similar issue. Changed the plugs and problem was solved. I hear that if the engine is not brought up to temp using fuel containing ethanol it can cause issues with the plugs. A fresh set solved my issue.
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