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vacuum leak |
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Rivercrest 
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Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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 Topic: vacuum leakPosted: 25-August-2020 at 5:05PM |
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Hi to all, just a quick question; would a rough idle cause irratic vacuum or would a vacuum leak cause a rough idle. ???? Any suggestions on how to narrow this down. I just changed my water pump and I seem to have created a rough idle condition which also shows up as a jumping vacuum reading on the manifold attached gauge. Thanks !!
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Rivercrest
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Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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Posted: 25-August-2020 at 5:08PM |
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I should also mention I replaced the thermostat.
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72FordGTS
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GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5846 |
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Posted: 26-August-2020 at 2:00PM |
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Did you connect all of your vacuum hoses back up after the water pump change? A lot of the water pumps had a thermal-vacuum switch on them for various vacuum controls. From your symptoms it sounds like a vacuum leak. They typically can cause a rough idle. You can also use the tried and true carb cleaner diagnosis, where you spray carb cleaner around the vacuum connections. If the engine speed increases, you have found the area of the leak.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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Rivercrest
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Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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Posted: 26-August-2020 at 5:00PM |
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Cured the problem, it was a vacuum leak. Used the spray method as suggested. Thanks.
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72FordGTS
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GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5846 |
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Posted: 27-August-2020 at 9:48AM |
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I am glad you got it figured out. How is your car coming along? We'd love to hear an update on the car and engine build.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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