IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: shmed on June 09 2014, 04:54:43 PM

Title: how to tell if a cam is going bad?
Post by: shmed on June 09 2014, 04:54:43 PM

like the title says how can I tell the car  was running great all week then out of no where  it starts idling rough an the boost vac gauge swings up an down like usually its steady 15 inches  vacuum   now at idle it bounces   15 7  19  4  all over the place.
any help appreciated
thanks dave

Title: Re: how to tell if a cam is going bad?
Post by: shmed on June 09 2014, 05:34:25 PM

did a little digging an found a crack on the header,  an the turbo is  shooting oil thru the motor. 
question I read the pushrods are supposed to spin is this when its running  or will they spin while  cranking with the key?
(flat tappet cam)

Title: Re: how to tell if a cam is going bad?
Post by: earlbrown on June 10 2014, 12:24:01 AM

they won't spin while running the starter.     

With the vacuum gauge, the swings are defined many ways.  different manors of swinging and/or twitching for different symptoms.

Title: Re: how to tell if a cam is going bad?
Post by: daveismissing on June 10 2014, 12:36:11 AM

Quote from: earlbrown on June 10 2014, 12:24:01 AM

With the vacuum gauge, the swings are defined many ways.  different manors of swinging and/or twitching for different symptoms.

http://www.ihadav8.com/forum/index.php?topic=3238.msg49621#msg49621 (http://www.ihadav8.com/forum/index.php?topic=3238.msg49621#msg49621)