okay... I'm getting a reading of 14" of vacuum at idle. A little low, yes. According to the books, when the throttle is blipped to wide open, and snapped closed, the vacuum should quickly drop to 0 (or nearly), and then jump up to ~3" higher than at idle, then come to rest at it's idle vacuum reading. When I do that, it drops to near zero (as it should), but then takes nearly a second to come back to 14". It never peaks over as it should... I have heard that this could be due to a restricted exhaust, which would explain why it's so quiet... What do you guys think? Oh - and I do not have any intake leaks, and compression is roughly 135 on all 6.
Posts: 9056 From: Keysville, Virginia, USA Registered: Nov 2001
ryan.....check your timing. If correct by the light, then the harmonic balancer has most likely slipped. Bump the timing up a bit and see if the the vacuum increases and the power also increases. Good luck!
------------------ 87 FIERO GT 2.8 5spd 0-60 in 6.8 seconds! If you found my advice helpful, please take the time to give me a positive rating. Thanks
Posts: 20784 From: Orlando, FL Registered: Dec 2002
Just an update... Oiling the cylinder only raised the compression 5-10psi, so I don't think the rings are at fault.. Cam lift is ~.360 (as best as I can measure, +-.01"), which is where it should be.. Cam timing *appears* to be correct, I'm just waiting for some responses to make sure I'm doing it right... Should cam timing be correct, I guess the only things left to suspect are worn/burnt valves and/or both headgaskets... [sigh]
[This message has been edited by ryan.hess (edited 10-31-2003).]