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Old 05-19-2017, 12:41 PM   #11 (permalink)
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Default Re: Just how screwed am I?

Maybe I should do a compression test? I'm starting to think I might have a broken piston ring or something a long those lines. Or could the crank angle sensor be causing all this. I somehow doubt I would lose vacuum from a bad sensor though.
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Old 05-19-2017, 12:44 PM   #12 (permalink)
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It sounds like it may be a misfire.
That was my next guess. Tried another set of plugs. Swapped in a spare set of coil packs that I know where good when I got them. And swapped plug wires with another set I know were good. Maybe a stuck injector? Idk I'm running out of ideas.
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Old 05-19-2017, 12:44 PM   #13 (permalink)
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Default Re: Just how screwed am I?

Its probably a gasket or hose or something, believe me, if theres internal damage, its makes sounds.
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Old 05-19-2017, 12:54 PM   #14 (permalink)
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Default Re: Just how screwed am I?

Would I make sense that the leak would have to be after my boost gauge in order for it to register? If it was before, the gauge would read normal vacuum because the leak would supply the missing air but still run wrong? Or maybe I'm completely wrong in my thinking.
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Old 05-19-2017, 01:08 PM   #15 (permalink)
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Default Re: Just how screwed am I?

a misfire will lower vacuum
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Old 05-19-2017, 01:12 PM   #16 (permalink)
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Default Re: Just how screwed am I?

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Would I make sense that the leak would have to be after my boost gauge in order for it to register? If it was before, the gauge would read normal vacuum because the leak would supply the missing air but still run wrong? Or maybe I'm completely wrong in my thinking.
If boost gauge is installed correctly at back of the intake plenum, it should almost always be before. Depending on the leak, it may not really register on the gauge. For example. I run 20 vac, but if I unhoook my EGR valve vacuum, it'll run like ~18 and run rich. only time you'll see zero on the guage is if the guage hose pops off.

Do you have an electronic boost gauge? does it need to be zero'd out? mine does when I unhook the battery. this can also cause an incorrect reading.

note: If your leak is before the turbos you'll run rich w/ extra air pulled in. if it's after the turbo you'll run lean as air gets pushed out and your turbo's will work harder to hit your set psi.
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Old 05-19-2017, 01:53 PM   #17 (permalink)
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Originally Posted by Forest Gump View Post
a misfire will lower vacuum
But you'd hear it miss. Does the car run?
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Old 05-19-2017, 03:47 PM   #18 (permalink)
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But you'd hear it miss. Does the car run?
I have seen my car run really rich when working on a tune and it will even reduce vacuum a lot.
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Old 05-19-2017, 08:29 PM   #19 (permalink)
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But you'd hear it miss. Does the car run?
I can start it and it will idle for a few seconds then die and other than moving it from the back of my property up closer to the back of the house I haven't driven it since I swapped the injectors. I can keep it running by opening the throttle, at which point it'll pull about 20" of vacuum at around 2500 RPMs. It sounds rough. But then again it sounds rough anyways because it doesn't have an exhaust on right now.
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Old 05-19-2017, 08:33 PM   #20 (permalink)
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I have seen my car run really rich when working on a tune and it will even reduce vacuum a lot.
I am starting to lean more towards your theory of a misfire. Im going to get new plugs this weekend and try again. Ive pretty much ruled out leaks. I have pulled apart the entire intake and put it back together so many times in the past couple of days I surely would have found a leak this bad by now. I have to fix my a/f gauge and I can at least see if its running rich or lean. The wires broke on the connection to the wideband controller so I have to redo those and connect it back to my scanmaster.
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