Checking dealer timing job (pics) and loss of vacume

[ChillinGST]

Hi, I'm fairly new to tuner world but have a lot of experiance with domestics. I've recently aquired my '98 gst and dropped it off at dealer to have timing belt changed (62k). Prior to change the engine idled smoothly and after warming up pulled 18 psi on my boost/vacuum gauge. Now after the timing belt change, it idles slightly rough and now only holds 14 psi on the vacuum gauge. So i pulled the timing cover and turned engine over to see where marks line up. I was under the impression there was only one notch on each of the cam gears, but found there are two marks per gear... What i found was that 1 set if marks line up but the other dosen't... Did the dealer botch the timing job or is this correct. Oh, also the car does run fine, but does not seem to pull as hard or spool up quite as quick.... pic 1, marks line up, pic 2 they do not...

 

[snowborder714]

I'm not sure if the timing marks are off or not. Your dowel pins look to be slightly past 12 o'clock. I would verify the other two marks (crank and oil pump) if you can. This should help you like up the cam gears exactly. Just make sure to only rotate the motor clockwise if you do so by hand.

 

[ChillinGST]

Ok, thanks. I'll have to wait till tomarrow, on my day off, to tear it down futher. So I take it both sets of marks on cam gears should line up? Possibly I over rotated, if one set of marks lined up and other didn't? I guess I will know more tomarrow.

 

[snowborder714]

The inner two cam gear marks should line up. To make sure they're straight, look behind them at the valve cover gasket (they should line up with it as well). The exhaust cam dowel pin will be at 12 and the intake dowel pin will be slightly past 12. The outer two timing marks won't line up with the middle two.

Check out this thread for some more info about that:
http://www.dsmtuners.com/forums/cylinder-head-short-block/301391-resolved-my-timing-off.html