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Quadrajet problem |
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Mikel 
AMC Apprentice 
Joined: Jul/15/2014 Location: CT Status: Offline Points: 85 |
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 Topic: Quadrajet problemPosted: Aug/06/2015 at 9:23pm |
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Hello,
I have an AMC 360 engine with a QJ. The engine will only idle with the idle screw all the way in, starting to run on the primaries. The engine has 9.6:1 compression and a Lunati Voodoo 262/268 cam, as well as a quadrajet. The carb I rebuilt myself (first time, so I may have messed something up), number 17058253, which does not have idle air bypass. I started with the idle screws one turn out and turned them 1/2 turn at the time, with no results. Timing is 20deg initial, 35 total. When I rebuilt the carb, I blew compressed air through the idle circuit and everything seemed clear. I have the same cam in an Olds 455 and it idles quite nicely, with a slight lope. Any suggestions? Thank you. Mikel |
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amc401t10
AMC Addicted 
Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: Aug/07/2015 at 7:14am |
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I have a q-jet on my 455 Pontiac powered rebel.
It has been reworked to run with a cam change(lunati voodoo tq monster). Buy cliff ruggles carb book, Lots of helpfully info for turning a q-jet, I am real happy with mine. pics   Edited by amc401t10 - Aug/07/2015 at 7:20am |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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toolmanxiii
AMC Addicted
Joined: Oct/16/2010 Location: Moncton Canada Status: Offline Points: 1384 |
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Posted: Aug/07/2015 at 9:24am |
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Running a big cam we had to drill 3/64 holes adjacent to the Idle port in the primary butterfly's. this allowed just enough air to idle but not enough to pull fuel through the primaries. some of the big cam big block's did this from Factory .
Edited by toolmanxiii - Aug/07/2015 at 9:44am |
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71 360 Hornet sst 83 2wd 360/727 Eagle wagon (crashed)
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imagechanger
AMC Fan 
Joined: Aug/31/2011 Location: NE Ohio Status: Offline Points: 19 |
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Posted: Aug/08/2015 at 7:21pm |
The Cliff Ruggles Q-Jet book is a must have. Tons of info and how-to tips to get them dialed in. It has a section on modifying the baseplate for idle bypass air. Might help your problem. |
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Mikel
AMC Apprentice
Joined: Jul/15/2014 Location: CT Status: Offline Points: 85 |
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Posted: Aug/08/2015 at 10:08pm |
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Hello,
I have a quadrajet from a '72 Toronado, which does have idle air bypass holes. I put it in to see how it would do, and it does idle much better. Since I rebuilt the first one, who knows if there is something wrong with it, so I'll be trying the second one for a while. Thank you all. Mikel |
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amc401t10 wrote: