0 Vacuum at idle HELP!
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From: Fayetteville, N.C.
See what the timing shows at idle in a datalog.
If the turbo is ok, I would peel back the wire loom of the harness where the cas and main harness come together to about the level of mid fuel rail. I have had 2 9's recently melt the grounds together and grounded out the coil and one injector.
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From: Malvern, PA
hmm thats interesting. ive never heard of that. ill take a look into that if the COP does not fix it.
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Ok. Here is my thought. It sounds almost like antilag... And if your building like 3-5psi that means your turbo is spoolin. Your just free reving it really shouldn't build boost. So that would point to timing. Have you logged timing to see what the ecu says its doing? But I would check timing, then the correlating sensors. Crank, camshaft. And the bolt on the exhaust camshaft didn't come lose by chance? The one that holds the metal piece on for the camshaft sensor to work? IDK for sure. Just some ideas to throw around.
Im really leaning to something timing related bc it sounds like your car is building boost out of the gate, but if its a stock turbo I suppose this may be possible. What did you gap your plugs at? Don't think its this issue but if you did something crazy....
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Im on a FP Black not a stock turbo. The plugs are gapped it .018-.020 im pretty sure it is not the plugs.
Yea... You shouldn't be able to free rev and get 3-5lbs of boost. So I think you should check timing issues. If you have truely checked everything one last thing that is possible but not likely, it could be your ecu....
Did you log the mivec advance? It goes with melted wires, but if the mivec signal is grounded, it may keep the intake fully advanced which gives max overlap and basically no vacuum.
Like I say, its just what I have run into recently and just an idea.
Like I say, its just what I have run into recently and just an idea.
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i all did hook up another boost gauge, it is reading correctly. TSP sensor works fine i tested that all ready.
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From: bayarea
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From: Malvern, PA
i could. ill do that when i get done work.
im not following you 100%
my idle should be around 1,100 RPM. it is idle at 500-600RPM "shown in video. I no my TPS is working because if i unplug it or try starting it without it connect it throws a CEL
im not following you 100%
my idle should be around 1,100 RPM. it is idle at 500-600RPM "shown in video. I no my TPS is working because if i unplug it or try starting it without it connect it throws a CEL
when you log TPS it shows a percentage...the percentage represents how open the plate is. Typically you should be at 0% at idle and 13-20% at cruise and 100% at WOT
Last edited by Evoryder; Oct 8, 2012 at 01:03 PM.
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From: Malvern, PA
o i see yea. even when you log it with the car off it still reads. it is reading correctly. i all ready cheacked that.