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eyob07
User
Nov 27, 2014, 2:39 PM
Post #1 of 6
(1477 views)
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hi everyone I was vacuum testing an engine and when I wide open the throttle the gauge doesn't drop and back, what kind of problem is this, the vacuum reading was around 18, this was 2000 Mazda tribute 3.0. thank you.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 27, 2014, 2:45 PM
Post #2 of 6
(1474 views)
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Could you describe what you mean more clearly.
What happens when you bring it up to 2000 and hold it there?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 27, 2014, 3:38 PM
Post #3 of 6
(1462 views)
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Ya - what are you trying to do? 18Hg at idle fine and if you snapped throttle just by hand for example under the hood it would quickly drop and come back or as HT asked what is it at steady 2,000 RPM which should be the same as idle with no load.
If you want and it's helpful info you still need to know you've tapped into actual manifold vacuum "T'd" into source such that what you are tapping into still operates whatever it went to.
Rather than this quite yet - what are you looking for or trouble are you having if anything?
T
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eyob07
User
Nov 27, 2014, 8:39 PM
Post #4 of 6
(1448 views)
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thank you for the response, what I meant was when I hook the engine vacuum tester and depress the gas pedal the vacuum gauge should drop to zero or close, I mean when the throttle is wide open, and this is not happening that's my question, and once again I don't know what is causing this if you can help I would appreciate.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 27, 2014, 8:40 PM
Post #5 of 6
(1447 views)
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Having too much vacuum is not a problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 28, 2014, 7:04 AM
Post #6 of 6
(1440 views)
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Does this vehicle have a drive-ability issue? Are there any trouble codes stored in the engine computer? If so, what are they?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 28, 2014, 7:06 AM)
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