Soundy
10-14-2005, 10:32 PM
Been meaning to ask about this for a while...
When I was checking the ignition timing on my A20A2, I pulled off the #2 vacuum advance hose as directed... the engine started sputtering and slowed to a crawl, as expected, and plugging the hose smoothed it out and brought the idle back up, though not to the same level it had been.
HOWEVER... simply pinching off the hose with it still attached, which SHOULD have the same effect, instead has NO effect.
With the hose attached, pinched or unpinched, the timing is at the 20-degree mark at about an 800rpm idle... with the hose disconnected and plugged, it drops to 650-700 and the timing mark is nowhere to be found, even with the distributor twisted to full-advance.
The real question is, shouldn't pinching the hose off while still attached (and I mean, pinching it TIGHTLY with pliers) have the same overall effect as removing and plugging it???
When I was checking the ignition timing on my A20A2, I pulled off the #2 vacuum advance hose as directed... the engine started sputtering and slowed to a crawl, as expected, and plugging the hose smoothed it out and brought the idle back up, though not to the same level it had been.
HOWEVER... simply pinching off the hose with it still attached, which SHOULD have the same effect, instead has NO effect.
With the hose attached, pinched or unpinched, the timing is at the 20-degree mark at about an 800rpm idle... with the hose disconnected and plugged, it drops to 650-700 and the timing mark is nowhere to be found, even with the distributor twisted to full-advance.
The real question is, shouldn't pinching the hose off while still attached (and I mean, pinching it TIGHTLY with pliers) have the same overall effect as removing and plugging it???