The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 327 Compression Test

'63MurderTruck · 08-03-2017, 05:46 PM

***UPDATE***

Vacuum Test:

Okay, I have to set the idle at around 1,200RPM in order to keep it running long enough to check the Vacuum...

It sporadically, randomly, and slowly fluctuates between 14 and 16 @ 1,200RPM. When I rev it - it goes down to ZERO, then up to a little over 20... then back down to 14-16.

I'm a novice but I think this indicates a Vacuum leak. What is the best way to track it down? I've tried spraying starter fluid, but no luck.

Thanks

08-03-2017, 05:46 PM	#10
'63MurderTruck Registered User Join Date: Nov 2014 Location: Mustang, Oklahoma Posts: 184	Re: 327 Compression Test - Results *UPDATE* Vacuum Test: Okay, I have to set the idle at around 1,200RPM in order to keep it running long enough to check the Vacuum... It sporadically, randomly, and slowly fluctuates between 14 and 16 @ 1,200RPM. When I rev it - it goes down to ZERO, then up to a little over 20... then back down to 14-16. I'm a novice but I think this indicates a Vacuum leak. What is the best way to track it down? I've tried spraying starter fluid, but no luck. Thanks