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#1 |
Registered User
Join Date: May 2011
Location: Raleigh, NC
Posts: 240
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Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
I have recently rebuilt my quadrajet on my goodwrench 350. I put it on last night, hooked everything up and I believe I set my float level too high. When I rebuild it, I seated the idle mixture screws, then turned them out 2.5 turns (Doug Rue's book). When I started the truck, it was blowing out black smoke at idle, and also when I revved the truck. It was also very sluggish when I tried to rev it. When I screwed the idle mixture screws in a full turn, it leaned it out slightly but black smoke was still visible during revs. It also did not like to rev, like it was a lot of work for it to rev up.
I drove the truck down the street and it didnt seem to have much power (less than normal). After fixing the float level, I am going to verify that the new fuel filter is still clean. Then I am going to manually turn over the engine until cylinder 1 is at top dead center, and then I plan to verify the balancer has not slipped and the distributor is not off a tooth. I set the timing at 4 degrees BTDC last night, but it still ran like garbage. Can a bad float level (too high) cause the truck to not have any power? I am kind of frustrated, and don't really know which direction to go, if you could not already tell. |
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#2 |
Just here to tinker
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Location: Holland, MI
Posts: 3,692
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
I would say your problem is still in the carb. If you have a vacuum gauge, use that to set your idle screws. You want to achieve the highest vacuum reading at idle. Make sure it is hooked to a manifold source and not a ported source. After those are set, leave them alone. If you still have black smoke, there's a chance that maybe a metering rod is hanging up or something. They are pretty easy to bend or damage during an overhaul. As for the stumble when you rev it, check that your air valves on the secondary are opening properly. They may be too tight and starving the carb.
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#3 |
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Join Date: Sep 2012
Location: Broken Arrow, ok
Posts: 181
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
I think your problem is that quadrajunk you rebuilt, I would toss it, I've never had any luck rebuilding them, now if I ever run across then they come off and go to the can.
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#4 |
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Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Float level will cause the carb to flood and dump a bunch of fuel into the engine, and create the black smoke you were seeing. Definitely verify that it is correct.
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#5 | |
Cruzzzn' Vet
Join Date: Jan 2005
Location: Porterville,Ca.
Posts: 1,918
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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#6 | |
Just here to tinker
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Location: Holland, MI
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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#7 | |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Quote:
All the morons who call them Quadrjunk, quadrabog and any other stupid name should not be touching a Quadrajet. If your getting response out of the mixture screws while it is still that rich, that is strange. When you rebuilt the carb, how did the plugs in the bottom of the main body look? If they are leaking it can become an issue. Did the power piston move in its bore smoothly? Another place to look is how well did you blow out the air bleed passages and the you did not over tighten the air horn. Q-jets are very complicated fuel metering carbs and can be tough to rebuild at times but with time a patients you will be happy with the results.
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#8 | |
Registered User
Join Date: Sep 2012
Location: Broken Arrow, ok
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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#9 | |
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Join Date: Jul 2010
Location: Janesville, WI
Posts: 664
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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#10 |
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Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Why are you setting your timing so low? Get that thing to ten! At least.
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#11 |
Registered User
Join Date: Jul 2012
Location: Des Moines IA
Posts: 1,250
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Are the plugs looking OK, or at least even with each other? A dead cylinder will make black smoke no matter what you do to the carb or timing.
I also agree the the Quadrajet is a great street carb when rebuilt and setup properly.
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#12 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,539
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Black smoke = too much gas. Float level too high or debris under the float needle. Did you epoxy the fuel well plugs? (pg 79-80 of Roe book). While you have the epoxy mixed up, put some on the casting plug on the filter housing.
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#13 |
Registered User
![]() Join Date: Feb 2009
Location: Scottsdale, AZ
Posts: 390
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Well said 406!
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#14 |
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Location: Scottsdale, AZ
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
MDc10: An opinion is one thing, pure ignorance is another.
The Quad is one of the best OEM carbs of its' time. Mother GM would not have stuck with it for so many years if it wasn't. I've been from sea level to 9000+ feet with several trucks/cars equipped with them and they are stellar. When set up properly... which ain't that tough. I think that 406 and myself get burnt out on ignorant guys coming on this forum and others bashing something that they don't understand. BTW, ignorant is not meant to be demeaning, just a statement of fact.
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-Don- '66 ![]() '77 ![]() '80 ![]() '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf ![]() |
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#15 | |
Registered User
Join Date: Sep 2012
Location: Broken Arrow, ok
Posts: 181
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#16 |
Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
i would say at least try to tune the idle screws with a vacuum gauge. If no vacuum gauge (pretty cheap) then turn the screws in--both screws must generally be turned in or out the same, just until the engine stumbles a bit, then turn them out just a hair.
Then verify that the choke is working correctly. 2) While 4BTDC may seem a little tame, i would say that if the engine can idle steady at 500-600 in gear or 700 in neutral then the ignition probably ok for now and not the real probably although advancing it would probably help performance overall. 3) What are you setting the float level to? |
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#17 | |
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Location: Scottsdale, AZ
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Quote:
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-Don- '66 ![]() '77 ![]() '80 ![]() '04 Denali XL '05 DMax CCLB 4x Have a Hickey Sidewinder Winch and need the owners/install manual? Send me a PM with your email address and I'll forward you a .pdf ![]() |
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#18 |
Just here to tinker
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Location: Holland, MI
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Alright guys, let's save the pissing match for another thread, eh? Arguing back and forth is not helping the original poster solve his problem, which is what we are here for, to help solve problems. He was not asking for opinions, he was asking for advice and that is all we need to give him.
Jrblanke- have you come any further with your issue? Posted via Mobile Device
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#19 |
Registered User
Join Date: May 2011
Location: Raleigh, NC
Posts: 240
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Thanks for the responses guys. I have not had a chance to update this thread.
I have had success in the past with q-jets and have spent about 90 bucks on books/filter/float/plastic cam/etc, so I am going to try to get it to work correctly. As far as the truck goes,I took today and tomorrow off to work on the truck. I took the top of the carb off and adjusted the float level and verified the fuel filter was clean. I have not started the truck and driven it yet because I got distracted sealing up an exhaust leak. I was going to start it today but did a stupid/dangerous move and forgot to hook the fuel line up. The truck has been sitting for a couple days so nothing was hot, but it still blew gas all over the top of the engine. I left the fuel line off the other night when I was called inside by the wife to tend to something else. I forgot to check the engine compartment before trying to start the truck. At least the fuel pump works, right? I need to purchase a vacuum gage in order to set the idle mixture screws correctly. Any suggestions on where to get that? |
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#20 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#21 |
No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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everyone is entitled to an opinion just when it come to this subject people get crazy. imo edlebrock is the worst carb made. that right there can set people off but its my opinion. back to the topic sounds like the fuel level was high. its also possible the front metering needles may not be set in the slot correctly which is easy enough to tell with a small probe. alot of rebuilds I've fixed were caused by the piston stuck up cause the gasket was installed wrong or the primary or secondary lettering rods were not seated properly actually one time this guy neglected the secondary rods all together
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#22 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Not even a gm crate comes with that low of timing. That is fact. Untill his ign system is fixed any triumphs with his quadbog( call me ignorant idc junk is junk) is forfeit. If the timing is bad so is the burn if the burn is bad not all the fuel is burned and voila black smoke
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#23 | |
Registered User
Join Date: Sep 2012
Location: Broken Arrow, ok
Posts: 181
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
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#24 |
Registered User
Join Date: Mar 2009
Location: TN
Posts: 410
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
Your timing is way off, try setting it at 6 deg and see if that makes somewhat of an improvement. You also need a vacuum gauge to hook up to the manifold port and see exactly what's happening when you turn the mixture screws in and out. Setting the float too high can cause it to bog....it sounds like you have several issues going on.
Personally, I would ditch the Quadrajunk as well. I've heard how great they can be when set up properly, etc. But to me, a carb that requires epoxy to be rebuilt "properly" is a piece of junk. The carb is more complicated than it needs to be, especially when there are other carbs out there, like Carter, that work just as well in stock form. The trade off just isn't there in my opinion. I wouldn't say Edelbrocks are "the worst carbs ever made", they've always worked great for me on stockish engines. You might one to pick up a 1406 and try tinkering with that if in the end it turns out the Qjet is junk, and I'm guessing it is. If they are as great as people say they are......try selling one.... Good luck
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#25 |
Registered User
Join Date: Aug 2012
Location: Northeast KS
Posts: 1,777
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Re: Rebuilt my quadrajet, still runs like dookie. Possible ignition issue?
interested to see how you came out, i just swapped the 1406 that was on my Jimmy back to a M4Me. i think my float level is a little high also. other than that, throttle response, part throttle, and wot are way better than the eddy.
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