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Carb tuning



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Old 12-17-2005, 08:52 PM   #1
 
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4x4idiot just gettin started
Unhappy Carb tuning

Alright need some help tuning my truck. I have read the earlier post on carb tuning tried not sure of results. I have an Edelbrock (EPS I think) carb on a Chevy 350. It would almost or would die if the gas was blipped but would run fine any other time. I messed with it (would not call it tuning) until I got a nice idle with none of the stumbling stated before. Now though it seems to lack power under WOT and just over all response. As of now both screws are turned out 2 1/2 turns, idles around 700-750 a little high with hopes to bring it back down some, and pulling a steady 17 on the vac gauge was at 21 before. I wish I knew the timing but that is a whole story in its self. With my lack of knowledge and patience I will turn to you for help. I would really like to find some one in the DFW area to give me a hand if at all possible. I think this way I would get the best results. But am open to all the help I can get so post away with any info you have. And about the help in the area I don't mind pay for a few for the help.
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Old 12-19-2005, 01:54 PM   #2
 
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No ideas at all. Anyone? Not even a smart ***** remark? Just throw out your ideas I will go from there.
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Old 12-19-2005, 02:28 PM   #3
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Check a spark plug. If they are black, you may have the fuel mixture screws out too far. You may be getting to much gas. What does the end of your tail pipe look like?
I am running a Holley Truck Avenger on my 350. Never put a timing light on it. Timed it by ear. Had the air/fuel mixture screws open too much to start with. Was fowling the plugs. Runs great now.
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Old 12-19-2005, 02:47 PM   #4
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buy or borrow a timing light and verify your timing is set correctly. If your timing is off you will never get the carb set right.

check your distributor as well, the older the dist. the bigger chance for worn bushings and possible shaft wobble. verify you have no carbon tracking in the cap and if it's HEI check the plunger under the coil as well.

get your timing set and tell us what it is.
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Old 12-19-2005, 05:33 PM   #5
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I'll help, but it's going to be after the first of the year before I could even think about making it to Ft. Worth. I cut my teeth tuning Carter/Edelbrock carbs, they really aren't difficult. As stated before, you need to know what your timing is set at, or you'll just be wasting your time and effort. Check your plugs and see what they tell you. When you open the secondaries, does it bog? Do you notice any flat spots? What fuel pump are you running and do you have a regulator if it's an aftermarket pump?
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Old 12-20-2005, 09:48 AM   #6
 
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Sorry for the story

Well the plugs are new the old plugs got fouled because of a bent push rod. The distributor is almost all new, cap, rotor, pick-up coil, vac advance, and has an Accel HEI coil on top. Now if the bushings are worn out don't know. As for the timing all I can say is that it is AFU. Well here the story goes. I was having idle problems and this guy that I use to work with and I tuned it some and it would be fine for a day or two then need to be retuned. That is when I went and rebuilt as much of the distributor as I could. That work for about a week before my stuck lifter showed me the real problem. I had a sticking lifter on #7 that had worn down the exhaust lobe and caused the intake push rod to bend. So I went and replaced cam, lifters, and the push rods. The cam is pretty mild duration 262/272, Lift .420/.442, so I should have no problems. While changing all of this out I also changed out the harmonic damper because I thought it might of slipped. No luck when I put the light on it the timing mark is at 12o'clock. If I retard the timing to correspond with the marker I cannot keep it running. The lowest I can take it is about were 14-16 deg would be. So as of now I have it set by the amount of vacuum, drivability, and ease of starting. I meet a guy last night that builds engines and he says he will take a look at it. So I will see what he has to say. It is about to really piss me off I want to drive my truck.
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Old 12-20-2005, 09:52 AM   #7
 
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Hey. 67_SS396 does your buddy still have any interest in that truck frame?
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Old 12-20-2005, 10:49 AM   #8
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you can buy a degree tape to mark your Harmonic balancer with. Maybe the guy you're gonna see will have one.
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If you need a ladder to work on your rig you might want to re-think your suspension.
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thats the look a 14yo boy has the 1st time he sees his 1st set of boobies . its the simple pleasures in life
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Wood yoo lik two bi a voul? I have won four cell.
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Old 12-20-2005, 11:34 AM   #9
 
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Never thought of that, thanks.
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Old 12-20-2005, 09:14 PM   #10
 
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Well I meet up the guy I mentioned earlier and he said it wasn't that far off. We richened it up a bite and added a few degrees to the timing. He said the problem with the stumbling when just blipping the gas was the accelerator pump that came in the 1405 was pretty much junk in his opinion. I will put some more miles on it and see how it works out.
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Old 12-20-2005, 10:34 PM   #11
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That stumble is a lean condition and is pretty easy to fix, it just takes a little trial and error.

I'll ask Jason and see if he's interested in that frame.
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