Re: [Chevelle-list] Miss at WOT ??? Steve & Tom

Sun, 05 Jun 2005 19:31:39 -0700

I went down the same path (new fuel pump, carb, coil, points, etc), but I didn't fix it until I used the fuel line cleaner. I also had stock points at the time. My problem also started after sitting all winter (yes, I use fuel stablizer).
 
Fuel line cleaner is cheap enough to try. I'd also disconnect fuel line after the pump and look at the fuel flow while someone turns the engine over. I think there is a spec on the flow rate you can check to make sure there is no fuel blockage between the tank and the pump.
 
Tom Tomlinson
 
 
----- Original Message -----
From: Tony Gavel
Sent: Sunday, June 05, 2005 8:57 PM
Subject: Re: [Chevelle-list] Miss at WOT ??? Steve & Tom

Steve & Tom, 
 
It's a single point distributor.  It's the original.  I ordered the car in 1970 and I haven't had any problems until I started it up this year.  It sat all winter in the garage.  I rebuilt the original spread bore 750 cfm, tried a Holley Economizer 450 cfm and a new Holley 650 and I still have the same problem.  New plugs and wires.  Distributor cap and rotor are fairly new.  If you floor it in park, it picks up and then misses and sometimes back fires when I advance the timing to about 16*.  It's worse when I set it to factory specs, 4* but now backfire.  It does the same when you drive it and floor it.  I did put a new fuel pump on and that didn't help. I guess I should change the coil next. 
 
tony
 
 
Sent: Sunday, June 05, 2005 1:19 PM
Subject: RE: [Chevelle-list] Miss at WOT ???

Is this an electronic ignition or a points distributor? Are we talking about a WOT condition at lower RPMs or at high RPMs?
 
The points used to "float" at high rpm's. The distributor lobe is basically hitting the points rubbing block so fast that there is no time to close and therefore trigger the coil to make a spark. That's why racers went to dual point distributors and magnetos.
 
I'm not that familiar with Holley's but it's possible or "over carb" an engine. Are you sure you have the right size for the engine and not some racing monster?
 
Usually timing would be what I checked first, and sometimes they like to be more advanced than factory specs in order to run at highest performance. If you haven't tried it yet, advance it until it begins to stumble, then back off a few degrees, (this will usually be where the engine idles the fastest and smoothest ) then tighten it down and take it for a test drive.
 
                                                                       Steve 
----- Original Message -----
From: Tony Gavel
Sent: 6/5/2005 9:16:10 AM
Subject: [Chevelle-list] Miss at WOT ???

Hi,  Wondering if any of you guys could offer a suggestion on what could be causing a miss(stumble) at WOT.  It's a 350 / 300hp original 70 Turbo Fire with a Holly.  It seems like a miss at WOT and stumbles, bogs down.  I played with the timing without any results.  I don't it's the carb because I tried 3 different ones and the engine reacts the same with each. Any ideas?
 
Thanks...tony
 

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