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Old 04-10-2006, 11:37 AM   #1
Springbuck
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SVT JRSC +BBK Boost

I ran a boost guage (autometer) to the engine just to check my boost and it is only reading about 5 PSI max. I have no leaks and the car is running fine. What can be the problem. I thought it was supposed to run about 10 PSI?


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Old 08-13-2013, 11:29 AM   #2
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I am aware I am bringing this back from the dead but I am having the EXACT same problem. I have checked almost everything. Running out of ideas.

Did you ever fix this?
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Old 08-13-2013, 12:14 PM   #3
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Is the belt slipping?
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Old 08-13-2013, 03:57 PM   #4
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if the belt isn't slipping, then it is a boost leak....which can be any number of things. either one of the gaskets could be bad, or the bypass valve could be worn/faulty (thereby bleeding off boost), or there is a hole/crack in one of your vacuum lines
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Old 08-13-2013, 07:44 PM   #5
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The belt isn't slipping. I did some digging and I'm pretty sure it's the bypass valve. I disconnected it and plugged the vacuum line that leads to it and took a drive and the car drives exactly the same.
I'm just a little confused shouldn't it be stuck closed or open when I removed the vacuum line?
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Old 08-13-2013, 10:10 PM   #6
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the vacuum line for the bypass valve is there to OPEN it when the car sees vacuum so that the boost has somewhere to go instead of causing pressure surges. Disconnecting it will only keep it from opening....if the valve is faulty it would be leaking regardless of seeing vacuum or not. to see if it has a leak spray some carb cleaner near it while the car is running and see if the idle changes.
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Old 08-13-2013, 10:26 PM   #7
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Yes and when I disconnected it in theory the valve should stay closed and I should build boost. But when I went for a drive the car drove exactly the same as when it was connected.

I sprayed carb cleaner a couple days ago and didn't find a leak I can try again tm.

Is it possible for the valve to be partially stuck open/closed? This way I can only build some boost but not max.
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Old 08-14-2013, 09:47 AM   #8
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Quote:
Originally Posted by SVTFocusOnMe View Post
Is it possible for the valve to be partially stuck open/closed? This way I can only build some boost but not max.
it is possible....but be forewarned, the valve is $310 from Moss to replace it...and that may not be the issue/only issue
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Old 08-14-2013, 09:50 AM   #9
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If it is my only issue at this point I will be happy. I have had nothing but bad luck with this kit so far.

Is there any other way to check if its functioning correctly?
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Old 08-16-2013, 11:37 AM   #10
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Okay so here's where I'm at now. Checked the wastegate. Car drives the same when it's closed. Now. When parked and in neutral. If I rev it I can get 9 psi which is acceptable since the blower is ported and I might read less psi but still get the same power. But when I go for a drive with wastegate closed I see 5-6 Max.
Sprayed carb cleaner everywhere didn't find a vacuum leak.
So I'm pretty sure I probably have a leak that only occurs during boost when there is pressure. Which makes it next to impossible to find.
So I'm pretty sure my only option is taking it apart and putting it back together a little more meticulously. Unless the original poster decides to sign on after a year of inactivity and tell me the problem he had.
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