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Old 08-02-2006, 09:59 PM   #1 (permalink)
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CB kills engine?????

Every time I key up the mic on my CB (Classic nightwatch) my engine dies. I am running a holly projection with analog computer. I have heard that the CB can cancel the computer. My question is: is there anything that can stop this from happening besides replacing either of them. ie is there some kind of filter that will eliminate this?
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Old 08-02-2006, 10:12 PM   #2 (permalink)
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Call Holley, GM ---years ago had the same problem, took about 10+ watts to do the caddys in
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Old 08-02-2006, 10:13 PM   #3 (permalink)
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I have found that when trying to get the holley pro junktion to work correctly the most sucessfull method is to take the computer out and carefully hang it from a tree, bush, fence, pole, junk car, bla bla bla..... .

And fire what ever high power weapon you can find at it
...
























And if you have no high power weapon.............







A BFH works good too
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Old 08-02-2006, 11:13 PM   #4 (permalink)
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I don't know jack about the Holley stuff, but what happens if you wire the radio directly to the battery (both + and -)? If it still happens, what if you use a separate battery? Is your antenna properly gounded?

I'm guessing - just guessing - that you've got a wiring problem somewhere. Also, you might post your question in the "Electrical systems" forum at http://www.cbradioforum.com/.

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Old 08-02-2006, 11:18 PM   #5 (permalink)
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had the very same thing happen in a cro-moly chassis carbon fiber bodied pro stock car last year with a racing radio(using a 9v not wired in) and an MSD digital 7 programmable. Turned out the chassis itself was magnatized. The radio interference totally fawked up the ignition. Ran a demag(degaussing) tool over the bars and it fixed the problem. may be totally unrelated, but worth a toss.
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Old 08-02-2006, 11:51 PM   #6 (permalink)
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often times it's rf radiated from the ant that gets into the "box".
Ground the case on the holley box and try some different mounting locations for the box and ant.
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Old 08-03-2006, 10:27 AM   #7 (permalink)
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Quote:
Originally Posted by TNRanger
had the very same thing happen in a cro-moly chassis carbon fiber bodied pro stock car last year with a racing radio(using a 9v not wired in) and an MSD digital 7 programmable. Turned out the chassis itself was magnatized. The radio interference totally fawked up the ignition. Ran a demag(degaussing) tool over the bars and it fixed the problem. may be totally unrelated, but worth a toss.
Antenna is properly grounded, wired directly to seperate battery. When using a less powerful CB it doesn't happen, or at least it doesn't kill the engine, just causes a sputte.

Where can I get a degaussing tool and do you run over the entire frame body and cage?

As far as relocating or remounting the "box" do you mean the computer?
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Old 08-03-2006, 10:37 AM   #8 (permalink)
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Quote:
Originally Posted by SpineTx
Antenna is properly grounded, wired directly to seperate battery. When using a less powerful CB it doesn't happen, or at least it doesn't kill the engine, just causes a sputte.

Where can I get a degaussing tool and do you run over the entire frame body and cage?

As far as relocating or remounting the "box" do you mean the computer?
It sounds to me like the Holly box is not properly shielded against RF. Make an enclosure for it out of sheet metal and see what happens.
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Old 08-03-2006, 11:00 AM   #9 (permalink)
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Look into Toroid Choke Cores... radioshack
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Old 08-03-2006, 11:18 AM   #10 (permalink)
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Originally Posted by thump93yj
Look into Toroid Choke Cores... radioshack
Excuse my ignorance, but what is that and what does it do?
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Old 08-03-2006, 11:44 AM   #11 (permalink)
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Might try slapping some tin foil around the Holly and some of its wires. See if that helps any. Quick and easy method to see if basic RF sheilding will help.

I still like the idea above of strapping the holly up and shooting at it.
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Old 08-03-2006, 12:15 PM   #12 (permalink)
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Are you running the early or late analog computer? The early ones have a finned case, and were more succeptable to the CB problem. The later ones had a smooth case. Try moving your computer further away from the CB. I remember this being a fairly common problem when the Projection setups first hit the market.

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Old 08-03-2006, 03:05 PM   #13 (permalink)
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Originally Posted by rotozuk
Might try slapping some tin foil around the Holly and some of its wires. See if that helps any. Quick and easy method to see if basic RF sheilding will help.

I still like the idea above of strapping the holly up and shooting at it.

Is the equivilent of the tin foil hat often suggested ofver in chit chat
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Old 08-03-2006, 03:28 PM   #14 (permalink)
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Originally Posted by pcorssmit
Are you running the early or late analog computer? The early ones have a finned case, and were more succeptable to the CB problem. The later ones had a smooth case. Try moving your computer further away from the CB. I remember this being a fairly common problem when the Projection setups first hit the market.

Pete
Yes it is the older analog computer, I will try to move the computer and try shielding it.

Is it possible that the computer is also inhibiting the performance of the CB?
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Old 08-04-2006, 07:44 AM   #15 (permalink)
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Not sure on the computer messing up the CB, I kind of doubt it, but I'm really not sure.

Pete
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Old 08-04-2006, 09:33 AM   #16 (permalink)
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Quote:
Originally Posted by thump93yj
Look into Toroid Choke Cores... radioshack
Still trying to figure out what this is, anybody?
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Old 08-04-2006, 10:15 AM   #17 (permalink)
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Still trying to figure out what this is, anybody?
It is an iron ferrite material that is formed like doughnut made to clamp around in this case your holly harness right before it goes into the ECM. The idea is that you are getting RF induced into the wiring of the ECM that is fawkin it up. The FF is most likly screwing with the crank sensor.

I would double check that the antenna system is not grounded, and make sure it is properly tuned.
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Old 08-04-2006, 11:02 AM   #18 (permalink)
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sorry... late reply... yep, see above... radio shack has a few variations of these... similar to what you see on a lot of usb pc cables etc. to combat rf interference.

I used one on my Quadzilla fuel box for my previous tow-rig... anyone with a high output cb keying next to me would cause the truck to stall. Depending upon grounding and such mentioned above... RF cant interfere with numerous vehicle gizzmos, computers etc.

Here's the RadioShack doodad I used
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Old 08-04-2006, 12:39 PM   #19 (permalink)
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how close is your antenna and coax to the computer? i would try moving the 2 as far from each other as possible would result in less rf into the computer. if that fails then look into building an rf shield for the computer.

powerful cb's could really interfere with electronics. My old base unit would overtake any electronic device in the house. i put an extra 10'-0" section of pipe under the antenna to raise it up and after that the only thing i had trouble w/ was my fm radio that sat on the same desk as my cb. moving the antenna and coax might help you.
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Old 08-06-2006, 12:52 PM   #20 (permalink)
 
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I had an 88 S-10 that the cell phone would make spit and sputter. Riding down the road, make a call, truck starts sputtering.
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Old 08-25-2006, 03:43 AM   #21 (permalink)
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I have found that when trying to get the holley pro junktion to work correctly the most sucessfull method is to take the computer out and carefully hang it from a tree, bush, fence, pole, junk car, bla bla bla..... .

And fire what ever high power weapon you can find at it
...
























And if you have no high power weapon.............







A BFH works good too

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Old 08-25-2006, 05:51 AM   #22 (permalink)
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You need to run shielded wires and you will no longer have this problem. Has been a problem for a long time for people with the old holley system
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Old 08-25-2006, 11:46 AM   #23 (permalink)
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How about you find somebody who can hook you up with stock 351 fuel injection and just put that in it? Then take the Holley crap and sell it to some other sucker. I may know a guy who can hook you up. Patience Randy, patience.
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