Holley Carb-Power Valve
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=439
Printed Date: November-24-2024 at 8:12pm
Topic: Holley Carb-Power Valve
Posted By: AWhite70
Subject: Holley Carb-Power Valve
Date Posted: June-03-2004 at 2:01pm
How can you determine if the powervalve in your carb is blown out?
In the process of getting my engine running and timed for the first time I had a coupld of decent backfires through the intake. I've heard this can take out a power valve.
The engine runs great in the driveway, but due to bad weather I haven't been able to put the boat in the water yet. I'm wondering if there are any signs I should look for when I finally do get the boat in the water that would indicate a faulty power valve.
Thanks
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Replies:
Posted By: danman
Date Posted: June-03-2004 at 9:44pm
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awhite - back firing, hard/long starts, and most important runs too rich!
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Posted By: Jeff
Date Posted: June-04-2004 at 7:26pm
Awhite,
I just rebuilt the Holley carb of my '89 351 because it was acting as danman described. It also put out a small amount of black smoke at idle (running rich). When I tore opened the carb, I couldn't see any obvious leaks in the power valve diaphragm, but it was very stiff. With the new PV installed, the engine fired up instantly, idled much smoother and no smoke from the exhaust.
Jeff
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Posted By: Kevin's '79
Date Posted: June-06-2004 at 4:20pm
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I have an Edelbrock performer Carb and it takes a while to start after setting for a week or so and it runs rich at idle. Does anyone know if this could be the same problem as the Holleys? It doesn't backfire. Any help would be appreciated.
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Posted By: Guests
Date Posted: June-06-2004 at 8:26pm
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I have an edelbrock performer carb also.I love the edelbrock compared to a holley.It does not have a powervalve in it.YOu might need to get the chart from edelbrocks website and change a metering rod and or jet or spring.Its real easy to do.
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Posted By: Kevin's '79
Date Posted: June-06-2004 at 10:56pm
Workky,
Did you make changes to yours? If so what exactly did you do? Were you having problems like I described above.
Thanks,
Kevin
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