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vacuum advance/pressure retard.
Posted by JohnB (more from JohnB) on Fri, 4 Jul 2003 04:58:35
In Reply to: Identifying a loose house on turbo, Bob, Thu, 3 Jul 2003 19:23:51
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Yes, it gives you vacuum advance and pressure retard. If it's disconnected it probably got blown off under boost.
Not directly connected to turbo.
However, without pressure retard the APC will drop the boost because of detonation at the 16 degree initial advance the car should be dialed in at.
Use some weatherstrip adhesive or a cable tie to hold the vacuum tube to the nipple on the TB. BTW, you might as well TEST the distributor advance/retard....suck on the hose with the engine idling...it should momentarily speed up as the distributor advances timing but the AIC will readjust the idle speed. Also, the vacuum advance should hold whatever vacuum you can suck. Conversely, blow as hard as you can (I've gotten 7-12psi this way but can't hold it...use a mityvac if you have one) which should depress idle speed momentarily for the same reason.
If none of this works, check the linkage within the distributor to see if it moves and is possibly disconnected, and if it's not disconnected, replace the vacuum advance.
An SPG9 or whoever they are now AID works pretty good but pricey. You may be able to search the List for a vacuum advance mod that pretty much duplicates the AID.
posted by 68.50.1...
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