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Old 06-12-2012, 12:51 PM   #1
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Idle problems

Feel this is a vacuum leak but I don't know ware. My idle goes up and down and then really high and will drop but then it just stays up. I have no clue...
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Old 06-12-2012, 02:09 PM   #2
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Originally Posted by sixpac
Feel this is a vacuum leak but I don't know ware. My idle goes up and down and then really high and will drop but then it just stays up. I have no clue...
I just had the same problem! I thought it was my plugs but then realized it was a vacuum leak, had a gash of about 1 inch on the hose.
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Old 06-12-2012, 03:08 PM   #3
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Have you checked your idle air control valve or your TPS voltage. You may need to clean the iac and reset your TPS and idle.
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Old 06-12-2012, 04:27 PM   #4
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you could spray carb cleaner around your intake, injectors, and vacuum lines to help pin point any leaks. if the idle goes up then that is your spot. becareful of electronics and electrical connection. but im with slowstang.
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Old 06-12-2012, 08:55 PM   #5
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If u know someone who has a smoke machine or try a cigar blow the smoke intot the manifold And see if u see any that comes out . 75 bucks a shop that has a machine that produces smoke just to check for vac leaks . Valvoline by me has it but I have not vac leaks all new parts and still bad idle
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Old 06-13-2012, 10:15 AM   #6
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Originally Posted by 93slowstang
Have you checked your idle air control valve or your TPS voltage. You may need to clean the iac and reset your TPS and idle.
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Old 06-13-2012, 12:06 PM   #7
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Meant to add that I has the same problem till yesterday. If your tps is out of spec (.98-.99) it will do it no matter how many times you set your idle.
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Old 06-13-2012, 12:09 PM   #8
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Reset tps? How do I do that?
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Old 06-13-2012, 12:19 PM   #9
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Here ya go, http://www.muscularmustangs.com/tps.php
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Old 06-13-2012, 06:17 PM   #10
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Re: Idle problems

i just fixed the same problem i thought it was a vac leak took the upper intake off(plenum) clean it with carb cleaner, cleaned iac, and egr, checked all hose. All this stuff was fine just cleaned it because i had already took it off. my problem was a faulty ignition coil. also could have been timing because i also replaced harmonic balancer, the old one was faulty had my timing off by atleast 6 degrees or more so even when i did the timing right with the old harmonic bal... making sure it was set at 10 degrees btc with the timing light it was still wrong even though it was set right i have 95 gt 5.0 hope this helps
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Old 06-14-2012, 05:11 AM   #11
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How much vac are y'all pulling. I am having the same idea problem. I am pulling between 17-18 right now. I never thought bout the coil. May have to try that.
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