vac still shows -10 at idle?? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 6 Old 08-17-2010, 12:26 AM Thread Starter
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vac still shows -10 at idle??

still getting -10 -11 at idle. i used carb cleaner. couldnt find any leaks at all. still get hissing sound after i shut car off. had a blower on it the a year now. no probllems at all during idle. i checked everything. i dont think its anything in the motor like compression or valves. because i would get 10ls of boost all day long.

i surfed around the internet little bit. has anyone heard of timing changing the vac. because i tuned it myself with a sniper base tune. and it did run rich. so just wondering about that.

also having a breather filter on the drivers valve cover wouldnt change this right??

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post #2 of 6 Old 08-17-2010, 04:18 PM
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What cam do you have in ur motor?


89gt, stock bottem end, gt 40 upper and lower, canfield alum heads, 75mm tb, F-cam, 70mm turbo. 3.27 gears,tko-600 tuned aem pms 4
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post #3 of 6 Old 08-17-2010, 04:51 PM Thread Starter
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pretty sure a stock one. i got the car about 2 years ago. with gears, full borla exhaust. it could have a cam. but i would notice for sure i would think.
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post #4 of 6 Old 08-17-2010, 09:38 PM
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Running rich at idle with low timing will cause low vacuum and high egt's.
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post #5 of 6 Old 08-17-2010, 09:42 PM Thread Starter
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ok thanks yea i think thats part of my issue as well. the timing is low. and my mass air hasnt even bin plugged in yet. pretty sure once i get it tuned it should be a ittle better
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post #6 of 6 Old 08-17-2010, 10:06 PM
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Oh ####, if no mass air it's will run like complete ass. Ecu has no idea what's going on. get that figured, then troubleshoot. Right now your just stabbing in the dark at a problem that may not exist.
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