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I'm stumped, intake pressure was fine one night and the next dropped to -12hg

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hadouken97gsx

Probationary Member
25
0
Feb 19, 2013
Granite Falls, Washington
I drove my car home one night and let it idle in the garage for a few minutes, boost gauge read roughly -19hg, even though I didn't drive hard whatsoever and in the morning when I started it I noticed my boost gauge was reading -12hg and has a little bit of a lumpy idle. Now I have searched and searched and found the biggest culprit was a BL. I did a BLT and found my intake manifold and my injectors were leaking a tiny bit so I replaced my IM gasket and injector seals and did a BLT which showed no leaks. Replaced my plugs, swapped in a known good EGR, scanned with obd2 and I ran bad rear 02 (which I have known) and p1105 fuel pressure solenoid. I bypassed the fps and still the same thing is happening. :cry: I am desperate guys as this is my DD and I had just got her running again 5 months ago. Any help is much appreciated and I am up to try anything to help it.
 
With a timming light. Power, ground, inducter over #1 spark plug. Pull the trigger and point it at the timming marks on your crank pulley.
 
Not spark timing, Mechanical timing. As in check the timing marks and make sure it didnt jump a tooth.
 
Check BOTH Mechanical and Base Timing just to verify and rule it out. Gotta start somewhere, process of elimination.
 
Will do tomorrow. Thanks guys, I'll post after with results.

So with a screw driver in my #1 plug hole I rotated the engine clockwise and when at tdc with my cam marks facing each other at 3 and 9 o clock my crank pulley is at btdc. Isn't it supposed to be at t?
 
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