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Re: Electronic QuadraJet and factory Electronic Spark Control [message #334470 is a reply to message #333679]

Tue, 03 July 2018 03:53

GMC2000

Messages: 193
Registered: March 2018
Location: Georgia

Karma:

Senior Member

Ive found more good stuff..

this is a fairly easy and inexpensive repair for worn throttle shaft bores with teflon bushings: http://rmcavoy.freeshell.org/Q_Jet_bushings.html

FWIW it does look like there is room in the throttle casting for small sealed ball bearings as those found on some weber carbs.

a link to the latest Q-jet manuals for all the spreadbore carbs. includes the two electronic ones: http://www.oldcarmanualproject.com/manuals/Carbs/Rochester/QJet/index.htm

and the best Ive found so far: http://truckroadservice.com/barth_attachments/7993991167_86_P30_service_part3.pdf this has both the E.Q-jet specs, All the ESC timing advance specs including the HEI module specs.

a rebuild including shaft bushings: https://www.hotrod.com/articles/ccrp-0908-qjet-carburetor-rebuild/

adjustment instructions: http://www.carburetor-blog.com/files/rochester_quadrajet_adjustments.pdf

BoboBob13, here is the wiring diagram for the E4MED:

http://www.73-87chevytrucks.com/techinfo/qjet/temp.gif

its a direct circuit with no ECU control like I thought it would have to be.

Edit to add: so the E4MED like the one you have (I think?) with its dual capacity pump is made to eliminate the cold stumble on the transition from idle to partial throttle. this would be very good to have with blocked crossover intakes IMO and it is an electric choke carb too.

there is also the M4MEF which is unique in that it is the only one that has air/fuel mixture screws on the secondaries.

check to see if your has the secondary mixture screws, IIRC this was only available on the 454/7.4l

[Updated on: Tue, 03 July 2018 04:48]

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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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