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CarGuru > 4 x 4 > LOW vacuum 27 June 2006 16:00:26

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LOW vacuum
Shades 11 April 2005 00:42:39
	'87 Chevy G20 Van At Idle, I have about 19-20 inches of vacuum...running down the road at 50-60 there is about 9! as soon as a mild hill is encountered, 3 inches of vacuum! It pulls the hill with little loss of speed. Why is the vacuum so low going down the road?
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Mad Dog 11 April 2005 02:48:52 [ permanent link ]
	The vacuum drops as the throttle plates are opened....this is normal behaviour. Pick a cruise speed where you have maximum vacuum and this where you will get the best mileage. -- Mad-Dog '79 Chevy K-10 Slightly modified pictures can be found here: http://mad-dog16.tripod.com/ -- "Shades" <shades_1970(at)netins(dot)net> wrote in message news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...> '87 Chevy G20 Van> At Idle, I have about 19-20 inches of vacuum...running down the road at > 50-60 there is about 9! as soon as a mild hill is encountered, 3 inches of > vacuum! It pulls the hill with little loss of speed.> Why is the vacuum so low going down the road?>
		Add comment


Slap 11 April 2005 03:55:35 [ permanent link ]
	Get a backpressure test done. Probably the CAT is plugged up big time. "Shades" <shades_1970(at)netins(dot)net> wrote in message news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...> '87 Chevy G20 Van> At Idle, I have about 19-20 inches of vacuum...running down the road 50-60 there is about 9! as soon as a mild hill is encountered, 3 inches of> vacuum! It pulls the hill with little loss of speed.> Why is the vacuum so low going down the road?>
		Add comment


Shades 11 April 2005 06:34:34 [ permanent link ]
	I know this! That IS the best the vacuum gets! It should be MUCH higher! "Mad Dog" <me@privacy.net> wrote in message news:3btoqaF6i15c9U1@individual.net...> The vacuum drops as the throttle plates are opened....this is normal > behaviour.> Pick a cruise speed where you have maximum vacuum and this where you will > get the best mileage.> -- > Mad-Dog> '79 Chevy K-10> Slightly modified> pictures can be found here:> http://mad-dog16.tripod.com/> --> "Shades" <shades_1970(at)netins(dot)net> wrote in message > news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...>> '87 Chevy G20 Van>> At Idle, I have about 19-20 inches of vacuum...running down the road >> at 50-60 there is about 9! as soon as a mild hill is encountered, 3 >> inches of vacuum! It pulls the hill with little loss of speed.>> Why is the vacuum so low going down the road?>>
		Add comment


Shades 11 April 2005 06:35:26 [ permanent link ]
	No cat. Was removed by a previous owner. "Slap" <slap@gmail.com> wrote in message news:X1j6e.957804$8l.909307@pd7tw1no...> Get a backpressure test done. Probably the CAT is plugged up big time.> "Shades" <shades_1970(at)netins(dot)net> wrote in message> news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...>> '87 Chevy G20 Van>> At Idle, I have about 19-20 inches of vacuum...running down the road> at>> 50-60 there is about 9! as soon as a mild hill is encountered, 3 inches >> of>> vacuum! It pulls the hill with little loss of speed.>> Why is the vacuum so low going down the road?>>
		Add comment


RJ in WV 11 April 2005 08:42:41 [ permanent link ]
	"Shades" <shades_1970(at)netins(dot)net> wrote in message news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...> '87 Chevy G20 Van> At Idle, I have about 19-20 inches of vacuum...running down the road at > 50-60 there is about 9! as soon as a mild hill is encountered, 3 inches of > vacuum! It pulls the hill with little loss of speed.> Why is the vacuum so low going down the road?> My uncle used to time his truck by the vacuum gage. Don't remember exactly how he did it, but I do remember the drastic difference a few degrees would make. Maybe the timing has slipped or the chain has jumped a notch. -- RJ in WV What do you do if the biggest hammer doesn't work? Cutting torch!
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Shades 11 April 2005 17:01:18 [ permanent link ]
	That would affect idle vacuum to though. I am installing a new timing set this week along with a water pump. Both have 140K on em. I will see if that does anything. "RJ in WV" <waterboySPAM@hotmail.com> wrote in message news:Xen6e.23$bR1.0@fe04.lga...> "Shades" <shades_1970(at)netins(dot)net> wrote in message > news:boudnR0SjOQqEsTfRVn-ug@rapidnet.com...>> '87 Chevy G20 Van>> At Idle, I have about 19-20 inches of vacuum...running down the road >> at 50-60 there is about 9! as soon as a mild hill is encountered, 3 >> inches of vacuum! It pulls the hill with little loss of speed.>> Why is the vacuum so low going down the road?>> My uncle used to time his truck by the vacuum gage. Don't remember > exactly how he did it, but I do remember the drastic difference a few > degrees would make.> Maybe the timing has slipped or the chain has jumped a notch.> -- > RJ in WV> What do you do if the biggest hammer doesn't work?> Cutting torch!>
		Add comment


Guest 27 June 2006 16:00:26 [ permanent link ]
	my 1996 nissan altima overheated and stalled. after I changed the radiator and took out as much water from the cylinders as I could, the car still won't start. Is there any way I can get the car started now?
		Add comment

CarGuru > 4 x 4 > LOW vacuum 27 June 2006 16:00:26

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