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Old 08-20-2013, 11:38 PM
prostar19092 prostar19092 is offline
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Join Date: Aug 2013
Boat: Mastercraft Prostar 190m1992
Location: Cincinnati
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Brand new 4160 problems

Long time reader first time poster and I used the search feature before posting.

I have a 92 Prostar 190 with the 351w HO engine. The 4010 carburetor has started to show its age so I bought a new brand 4160, the correct one designed for 351W.

Here’s the problem. It runs really rich at idle, and runs best with the idle screws all the way in. I know this is not correct, and it is getting fuel from somewhere else. Thinking I got a bad carb, I returned the first 4160 and got a replacement. I followed the directions and watched the video on the Holley website on how to adjust the idle screws several time and have a good idea on how this stuff works. It is running so rich that when I pull the PCV hose off the spacer the rpm rises. In the process of trouble shooting I put the 4010 back in and those idle mixture screws kill the motors when screws and screwed all the way in.

I know that I do not have a blown power valve being that it is brand new. I can’t see any fuel pouring out of the ventures on idle. I am stumped. The only thing I haven’t checked is the fuel pressure, but the 4010 works just fine. Only reason I replaced it is that it started to get leaky seals. I never thought I would say but the 4010 seems to work better.

Thanks for reading.
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  #2  
Old 08-21-2013, 09:37 AM
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johnnye23 johnnye23 is offline
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Join Date: Jun 2013
Boat: 1979 Stars n Stripes
Location: Auburn Ca
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Idle mixtures screws all the way in and it still runs normally points to a bad powervalve.
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Old 08-21-2013, 01:23 PM
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thatsmrmastercraft thatsmrmastercraft is offline
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Boat: 1977 Stars & Stripes
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Sounds like power valve. Remember...........new doesn't always mean good.

Could also have a significant base gasket leak.
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Old 08-21-2013, 09:19 PM
prostar19092 prostar19092 is offline
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Join Date: Aug 2013
Boat: Mastercraft Prostar 190m1992
Location: Cincinnati
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This is the second brand new 4160 I have had on the boat in as many weeks. I did double check the power valve on the new 4160, and it is a 2.5 and good. I am stumped. The only thing I can think of is fuel pressure is too high, but it ran perfect minus a few small leaks because of the old rotten seals on the 4010. I am checking the fuel pressure tomorrow. I called the Holley help line, they were no help?????? I did put the old 4010 back on to ski tonight and it ran perfect.
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