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Vacuum Leak??

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Old Nov 2, 2009 | 09:50 PM
  #11  
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I'd like to know why water is a bad idea as well........
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Old Nov 2, 2009 | 09:59 PM
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correct me if i am wrong, but if you did have a leak, and you poured water on it, it will suck water into the engine correct? Wouldn't sucking in water into the intake runner be a bad thing?


I prefer to use carb cleaner, and i drag my laptop around to the front of the truck. Fire up the scanner and log STFTs and LTFTs, when they change drasticaly you have found your leak... I have done this on several trucks and it works like a champ, sometimes the leak is small and the carb cleaner does not change the idle at all, but the trims change...
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Old Nov 2, 2009 | 10:10 PM
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I never said it was stupid. I said I wouldn't use water.

If carb cleaner enters the combustion chamber by finding a vacuum leak, it will enrich the mixture, and you will hear the engine sound change. Water is not combustible. However, since it does not compress, it will also make your engine sound change. I don't consider this to be a good thing. Your engine is already running lean, and you're gonna add water to it??

I'm gonna throw the ball back into your court now. Please explain to me how adding water is a GOOD thing?
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Old Nov 2, 2009 | 10:18 PM
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OK guys, I'll try the carb cleaner FIRST, and if that doesn't work I'll try the water. I already have some carb cleaner and I have nothing on the engine painted, so it'll be fine. And what is a DRASTIC change in Fule trims that I should look for???
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Old Nov 3, 2009 | 07:12 AM
  #15  
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Water doesn't destroy the paint on your firewall or leave a mess, it doesn't eat the rubber engine components away like a lot of carb cleaners will, and for the little bit that gets into your engine, it won't hurt it. Years ago people would dribble water down their carburetors whilel revving the engine up to de-carbonize them anyways. Think of it as an internal steam cleaning.
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Old Nov 3, 2009 | 07:24 AM
  #16  
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What vaccuum are u currently pulling? Why does ur tuner think u have a leak?
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Old Nov 3, 2009 | 09:05 AM
  #17  
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BTW did you put some vasoline on the injector orings before installing them?
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Old Nov 3, 2009 | 11:24 AM
  #18  
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Originally Posted by AKlowriderZ71
Carb/choke cleaner works well for this also. Don't use brake/parts cleaner.
Why not brake cleaner, such as Brakleen? As long as it's the flammable kind it will work, we've used it at work many times in a pinch.
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Old Nov 3, 2009 | 11:26 AM
  #19  
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Originally Posted by dhpro
What vaccuum are u currently pulling? Why does ur tuner think u have a leak?
Like right around 20 at idle, but my Trims are REALLY screwy, and idle is a little off also
Originally Posted by BlackGMC
BTW did you put some vasoline on the injector orings before installing them?
Um...no. That may be the prob
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Old Nov 3, 2009 | 11:56 AM
  #20  
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Ya, when i installed my injectors i did not lube them up and that caused my vacuum leak, not saying that is your problem but it solved mine...
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