Float. Probably time to rebuild the Q-Jet.
Carb Car only Stalls/Dies when Cornering?
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 845
Likes: 12
From: LAKE BARRINGTON IL
Carb Car only Stalls/Dies when Cornering?
Hi guys,
I have a carb setup, rochester q jet, bought car last summer. Has 348 in it...weird I know. Was fine last summer and just this week it will stall, sputtered like it is being starved and dye out ONLY when I corner hard. The harder I corner the faster it will dye out...the lighter/slower, the less.
Just started yesterday...I tried carb cleaner today...no luck.
Thanks,
R
I have a carb setup, rochester q jet, bought car last summer. Has 348 in it...weird I know. Was fine last summer and just this week it will stall, sputtered like it is being starved and dye out ONLY when I corner hard. The harder I corner the faster it will dye out...the lighter/slower, the less.
Just started yesterday...I tried carb cleaner today...no luck.
Thanks,
R
Melting Slicks
Joined: Dec 2009
Posts: 3,235
Likes: 658
From: Thunder Bay
Most likely fuel starvation. I would start by looking at the float level. I suspect there's not enough fuel in the bowl and when the fuel sloshes around its uncovering the jets and you're sucking air. I'm not a Q-jet expert so I can't tell you exactly what's happening in there, but I think that's the most likely scenario.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Most likely fuel starvation. I would start by looking at the float level. I suspect there's not enough fuel in the bowl and when the fuel sloshes around its uncovering the jets and you're sucking air. I'm not a Q-jet expert so I can't tell you exactly what's happening in there, but I think that's the most likely scenario.
Start by checking the float and float level. If the carb hasn't been rebuilt in a while, the float could easily be worn out too...
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
Check your fuel pressure. At least you don't have to take the carb apart to see if that is a factor.
If that is ok then I would definitely say that the float is not set right or has partially flooded, affecting the fuel level in the bowl. If you have to take it apart then you might as well get a carb kit and a float. Clean it up then put it back together with new parts.
If that is ok then I would definitely say that the float is not set right or has partially flooded, affecting the fuel level in the bowl. If you have to take it apart then you might as well get a carb kit and a float. Clean it up then put it back together with new parts.
Pro
Joined: Jan 2005
Posts: 535
Likes: 0
From: Southaven MS
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Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Honestly, if you do this right, you'll end up putting in a new filter AND a new float, so it'll be hard to tell which one was the source of the original problem.
Last edited by Shark Racer; Mar 21, 2012 at 11:22 PM.
6th Gear
Joined: May 2010
Posts: 6
Likes: 0
I had the same issue with my car. In a sharp turn, occasionally the engine would die. I opened the hood and checked the carb, it was flooded out.
Ultimately, it turned out to be the float level was set to 0.25" which is way too high for my Q-jet. Adjusted it down to 0.420" (see Lars Q-jet Tuning Paper for year specific levels) and the problem never came back.
Moving the float level this much did require checking the air/fuel at all speeds. But maybe replacing your float and setting it to service manual height, with a new seat and filter will fix your problem.
Ultimately, it turned out to be the float level was set to 0.25" which is way too high for my Q-jet. Adjusted it down to 0.420" (see Lars Q-jet Tuning Paper for year specific levels) and the problem never came back.
Moving the float level this much did require checking the air/fuel at all speeds. But maybe replacing your float and setting it to service manual height, with a new seat and filter will fix your problem.
Drifting
Joined: Mar 2011
Posts: 1,886
Likes: 9
I have the same problem with my Q jet. Just started recently. The air/fuel ratio gauge showed the mixture getting richer the harder and faster that I cornered. I rebuilt the carb, and lowered the float level to 3/8", thinking the fuel was sloshing over. It has somewhat improved, but it still isn't right.
Maybe I should lower it some more?
Maybe I should lower it some more?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Most Q-jets have a phenolic (fuel-capable plastic) insert that fits in the upper portion of the fuel bowl. This minimizes fuel 'slosh' or 'spill' and prevents fuel starvation when turning. If you don't have one, you need to find one for your carb.
Otherwise, the float is either set too high or too low.
Otherwise, the float is either set too high or too low.
Burning Brakes
Joined: Apr 2009
Posts: 828
Likes: 2
Floats!
Years back when I used to repair Ferrari's the 308 GTB had the same problem. If you made a sharp turn, the car would stall, due to the weber floats.
Ferrari then made the 308GTSi which was injected and the problem went away.
Open the carb, re-adjust your floats to the manual, check your fuel pressure and make sure there is fuel in the tank.
Trouble should be gone
Years back when I used to repair Ferrari's the 308 GTB had the same problem. If you made a sharp turn, the car would stall, due to the weber floats.
Ferrari then made the 308GTSi which was injected and the problem went away.
Open the carb, re-adjust your floats to the manual, check your fuel pressure and make sure there is fuel in the tank.
Trouble should be gone
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
well who actually knows but for arguments sake assume that there is just enough flow to allow WOT....and no more....now take this minimal amount and push it to the the outside of carb because of going around a turn. some times its hard to know which is the problem just as shark racer says. i had an austin healey 3000 and my buddy had one also and his would always stall out....we went through everything and finally determined it was a rusted out fuel line that had something in it that would block flow...that took a lot of effort to figure that one out
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 845
Likes: 12
From: LAKE BARRINGTON IL
Thanks guys for the info!
69 chevy- it is the W motor...odd combo, will look to sell, just dont know what to put in...
bobs77vet...weird...murphy's law on that one!
Well, I checked everything and took it for a ride...NO issues... I think the carb is tired and needs a rebuild...the oil has started turning a little quick...since I just changed it last week. Also, it seems a little more rich out the pipes...
69 chevy- it is the W motor...odd combo, will look to sell, just dont know what to put in...
bobs77vet...weird...murphy's law on that one!
Well, I checked everything and took it for a ride...NO issues... I think the carb is tired and needs a rebuild...the oil has started turning a little quick...since I just changed it last week. Also, it seems a little more rich out the pipes...
Thread Starter
Burning Brakes
Joined: Aug 2008
Posts: 845
Likes: 12
From: LAKE BARRINGTON IL
very nice today...took car out...smelled a little more richer...noticed some fuel on the intake manifold...looks like a CARB REBUILD!....AND it did act up from time to time....
