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#1 |
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Join Date: Jun 2007
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I've seen this situation three times. The first time was insufficient grounding, the second was a bad two step switch, and the third was a bad MSD rpm chip.
I think the original poster mentioned that the car is a Corvette; remember that these are wired differently from the factory as there are no natural body grounds with fiberglass. In the midyear cars even the radio antenna had to have a separate wire to the frame for it to work. That can sometimes also cause problems with RF interference to/from the MSD box as the fiberglass isn't any sort of shield. Again, in the stock versions a metal cage surrounded the ignition wires so the radio would work. With the battery in the stock location behind the seat, the negative cable is very short as the frame is right there. I'd still check it carefully to make sure it's still internally sound enough to do its job. Ben has done a remarkable job of running down all those little things that could cause the problem. Unfortunately, I've often had the experience that the longer you thrash on a problem, the farther you get away from what is really causing it. I've seen some of the best minds in racing here in this thread, and it's amazing we still don't have a fix. Hang in there, Ben. |
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#2 |
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Join Date: Jan 2005
Location: Milwaukee, WI
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Gary,
I appreciate your input. A vacuum leak has crossed my mind a number of times, but the car seems to be running rich, as opposed to lean, as I would expect with a vacuum leak. I'm certainly open to the possibility however, that I'm misinterpreting something. What's the best way (ie: effective and safe) to check for a vacuum leak? Anyone? Dan, You're spot on with your Corvette thoughts. They are a slightly different animal. Just to reiterate, and speak to the items you mentioned, my negative battery cable was fairly new, but I just replaced it last month, to be sure. At the same time, I payed a great deal of attention to all of the ground circuits on the car, and made some nice improvements along the way. I've already unplugged the two-step and removed and replace the RPM modules, with no change. Thank you for your words of encouragement. -Ben |
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#3 |
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Join Date: May 2006
Location: Murfreesboro TN
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Ben,
Consider getting a known good basic Holley 3310 or similar carburetor, and bolting it on with an adapter.
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Alan Roehrich 212A G/S |
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#4 |
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Join Date: Jun 2012
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It's probably an electrical problem - but I do like the idea of trying a carb. that you know is good. That's a really good way of eliminating a lot of potential problems. As far as vacuum testing is concerned, it helps to know where your engine ran when it was running well. In any case, you can find LOTS of info. on-line concerning vacuum testing. Check out:
http://www.atlanticz.ca/zclub/techtips/vacuum/ Looks like some good info. there. |
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#5 |
Member
Join Date: Oct 2005
Location: N.S. CANADA
Posts: 498
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At the Lucas Oil in late May at Reading I had something in the screen of my fuel pump inlet which cause cavitation in the fuel(by not allowing a good amount fuel to get to the pump).It rev free in neutral.but going down the track miss like a pig.the fuel coming out of line was not clear,it look milky.there still lot of flow but it was full of air.maybe some thing look at.
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1231 FS/D Drag Pak 1231 E/SA 71 Demon Kelly MacKay Last edited by dartman; 06-21-2012 at 08:57 AM. |
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#6 |
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Join Date: Nov 2008
Location: Ontario,canada
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ben,has the thought of putting engine back on dyno crossed you mind,you have done everything else,its a pain in the *** but you gotta be gettin super frustrated at this point
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#7 |
Senior Member
Join Date: Mar 2006
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Here is a thought,
Is your distributor advance locked out? If so, with the distributor cap removed can you rotate the rotor at all? Here at the Tulsa divisional yesterday, I had a horrible miss on Q1. Checked wiring, valve lash, and for some reason I checked the rotor, it was moving around, my poor attempt to lock it down from a couple of years ago had failed. Good thing JB weld was invented. That fixed the miss for Q2. Good luck Sean
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Sean Marconette 84 Mustang 5060 SS/N |
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#8 |
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Join Date: Jan 2005
Location: Milwaukee, WI
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Gary,
Thank you for the link. That's good info. I'm curious if anyone knows how much vacuum to expect out of a BB Chevy stocker cam? Dartman, Thanks for your input. I've completely disassembled and checked the fuel system, with the exception of pulling the pickup out of the tank, but I can see the pickup and screen very well by looking down into the fuel tank with the cap off. I believe that the fuel system is completely in tact and functioning as it should. Larry, Yes, that has crossed my mind, and continues to be an option, but I've got a few more things to play with yet. Sean, The distributor rotor seems to be good. It doesn't move when I try to rotate it. Thanks. Tim, At times I think that my patience may be a detriment to figuring this out. Regardless, 123 posts, and the ideas keep coming. I can't express enough how much I appreciate the support and encouragement I've received in trying to figure out this problem. While I'm continuing to look at the little things, I'm gearing up to test the car at full throttle to get a better feel for what I'm working with (or against). -Ben |
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#9 |
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Join Date: Jan 2005
Location: Milwaukee, WI
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Well, this is coming about 2 months too late, but I’m proud to say that I finally got this problem licked. As a last ditch effort, I decided to buy an adapter, bolted on a 780 Holley, and presto!......the car ran great. Next step, called Dean Oliver. He sent me the same spare Quadrajet carb that he sent me last year. Bolted it on, and again, the car ran great. Those of you who have been following this thread closely are probably wondering what changed between this year and last, right? Well, last year, I never actually took the car out and drove it with the carb that Deano had sent.(insert video of hand smacking forehead). Instead, I relied on my perception of how the car felt when revving it up. If you go back and read, I noted that the car seemed to run better, but for some reason, I decided that the problem still existed. You can chalk that one up to inexperience.
So, I sent the carb back to Deano, and he took care of the rest. THANKS DEAN! I've had the car out three times now since July, and I must say that it sure feels good to finally be out racing again after 5 years. A final huge THANK YOU to everyone who offered up their time, experience, ideas, and support. And thank you to Ken Miele for making this forum available to rookies like me who can use a helping hand from time to time. God willing, I look forward to meeting some of you at the races in the coming years. Best Regards, Ben Kallies B/S 3869 |
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#10 |
Member
Join Date: Nov 2001
Location: manville nj
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Deano is the best ....period
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