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Re: Electronic QuadraJet and factory Electronic Spark Control [message #333708 is a reply to message #333679]

Tue, 19 June 2018 16:11

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma:

Senior Member

I am not sure what the cfm of the quadrajet is that is on our coaches...

I just made a trip about 600 miles out to Mt. Rushmore and 600 miles back home.

The trip out there, I do not believe my secondaries were opening. My carb was rebuilt back in 2012. I usually drive on flat roads, but going out to South Dakota, I was heavy on the throttle, and pretty disappointed in it's performance pulling my 99 CRV up the hills. on the flat my vacuum was normally at 10, but hitting the hills and pressing on the throttle quickly dropped it down to about nothing, and I slowed down quite a bit as the coach seemed to really struggle holding any speed.

I looked at it before I headed back East, and found the secondary plate seemed a little sticky, and squeaked when I pressed on it. After putting some oil on the spring that held it closed, it opened up with very little effort.(pushing on with finger). I also verified that when pushing the foot pedal down the lower flaps would open fully.

On the way east, the hills were not as bad as going west, and the GMC performed significantly better and you could hear the change in the carb when I hit a hill and had to push down the peddle a bit more. My vacuum going home was up a couple notches to probably 12 on the gauge on the flats, and pressing on the pedal, it still dropped down to nothing, but there was much more power, and the slow down was not as drastic. 6.5 MPG coming home, running hard on the only tank I checked. (never put much into that as I think there is large decrepency as to how full I get my tanks each time I fill up).

So from my experience Saturday/Sunday, the secondaries normally only open on harder acceleration, and hill climbing. They are not open or needed at flat cruising speed, even at south dakota freeway speeds. I think Jim is Correct it is about the 5-7 on the vacuum gauge when you start to hear them open up.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

[Updated on: Tue, 19 June 2018 16:14]

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[Message index]

		Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 00:48
		Re: Electronic QuadraJet and factory Electronic Spark Control By: Chris Tyler on Tue, 19 June 2018 06:26
		Re: Electronic QuadraJet and factory Electronic Spark Control By: JohnL455 on Tue, 19 June 2018 07:22
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 15:12
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: James Hupy on Tue, 19 June 2018 15:58
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 16:15
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: lqqkatjon on Tue, 19 June 2018 16:27
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: James Hupy on Tue, 19 June 2018 16:27
		Re: Electronic QuadraJet and factory Electronic Spark Control By: lqqkatjon on Tue, 19 June 2018 16:11
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 18:00
		Re: Electronic QuadraJet and factory Electronic Spark Control By: Matt Colie on Tue, 19 June 2018 19:03
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 19:59
		Re: Electronic QuadraJet and factory Electronic Spark Control By: mrgmc3 on Tue, 19 June 2018 22:04
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 19 June 2018 22:34
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Wed, 20 June 2018 10:44
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Wed, 20 June 2018 12:52
		Re: Electronic QuadraJet and factory Electronic Spark Control By: JohnL455 on Wed, 20 June 2018 20:47
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Thu, 21 June 2018 12:05
		Re: Electronic QuadraJet and factory Electronic Spark Control By: BoboBob13 on Sat, 30 June 2018 21:50
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Sat, 30 June 2018 23:03
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Sun, 01 July 2018 02:37
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Sun, 01 July 2018 08:03
		Re: Electronic QuadraJet and factory Electronic Spark Control By: BoboBob13 on Sun, 01 July 2018 15:28
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Sun, 01 July 2018 08:36
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Sun, 01 July 2018 09:50
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: jimk on Sun, 01 July 2018 10:13
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: BoboBob13 on Sun, 01 July 2018 15:18
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: James Hupy on Sun, 01 July 2018 15:35
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Sun, 01 July 2018 13:55
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Sun, 01 July 2018 15:44
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Sun, 01 July 2018 16:21
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Sun, 01 July 2018 19:01
		Re: [GMCnet] Electronic QuadraJet and factory Electronic Spark Control By: jimk on Sun, 01 July 2018 19:16
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Sun, 01 July 2018 19:14
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Mon, 02 July 2018 07:20
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 03 July 2018 03:53
		Re: Electronic QuadraJet and factory Electronic Spark Control By: BoboBob13 on Tue, 03 July 2018 08:49
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Tue, 03 July 2018 07:32
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 03 July 2018 10:18
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Tue, 03 July 2018 13:29
		Re: Electronic QuadraJet and factory Electronic Spark Control By: GMC2000 on Tue, 03 July 2018 17:57
		Re: Electronic QuadraJet and factory Electronic Spark Control By: jhbridges on Tue, 03 July 2018 19:52

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