Welded and it wont start - Team Camaro Tech
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post #1 of 14 (permalink) Old Jan 13th, 08, 05:35 PM Thread Starter
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Welded and it wont start

I welded on my 69, rear axle. I disconnected the negative of the battery. The car turns over like normal but doesnt seem to have any ignition. Not even a burp, just turns over. I am thinking the welding may have shorted something or something. The car has a 454 with a HEI ignition. Any suggestions welcome.
I havent look much yet but was going to start with fuses.

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Rushforth rated X with Toyo tires. MSD 6 ignition.
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post #2 of 14 (permalink) Old Jan 13th, 08, 05:59 PM
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Re: Welded and it wont start

Why don't you pull a plug wire first and see if you have spark to the plugs. Would hate to see you go looking for an electrical issue if it is a fuel problem.

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post #3 of 14 (permalink) Old Jan 13th, 08, 06:28 PM
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Re: Welded and it wont start

I always make it a point to isolate the ignition when welding on a car. It's something I learned from my Dad years ago. I know it's a huge risk when running a Mag, I thought it was a lower risk with a distributor. If any of the ignition you're using is electronic I could easily see current backflowing into the ignition and burning up a diode.

Where was your ground clamp in relation to where you were welding?
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post #4 of 14 (permalink) Old Jan 13th, 08, 08:12 PM Thread Starter
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Re: Welded and it wont start

The ground strap was next to the weld which was the rear axle. The fuel gage on the carburetor is registering 7 psi. I could smell the gas also. Pretty sure it is ignition. I haven't looked in depth yet. Maybe tomorrow. I was wondering if someone had a similar experience and knew what it was. I need to do a little leg work.
Thanks

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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post #5 of 14 (permalink) Old Jan 13th, 08, 08:34 PM
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Cool Re: Welded and it wont start

Hey Bob..
Give me a call if you need an extra hand on Monday checking for spark.
I'll need to leave for work by noon.

- Tony
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post #6 of 14 (permalink) Old Jan 13th, 08, 08:39 PM
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Re: Welded and it wont start

I disconnected the battery and I still killed the radio after I welded on the car.
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post #7 of 14 (permalink) Old Jan 14th, 08, 06:16 AM Thread Starter
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Re: Welded and it wont start

I am thinking it is the electronics module inside the distributor. I will look at it later this week.
Thanks

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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post #8 of 14 (permalink) Old Jan 14th, 08, 07:51 AM
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Lightbulb Re: Welded and it wont start

>> My 68 came out of the body shop in a flat bed, and when I tried to start it at home, there were no sparks at all. It ended up being a bad pick up coil. I too blame the weldings.

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post #9 of 14 (permalink) Old Jan 14th, 08, 08:47 AM
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Re: Welded and it wont start

Yikes! I've had two things welded, in-place, with a mig on my car. No damage. Scary. Oh no, three things. Lot's of older computer modules too. Everything was left as-is during the work. How do you guys 'isolate'?

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post #10 of 14 (permalink) Old Jan 14th, 08, 09:09 AM
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Re: Welded and it wont start

The sad thing is we all go get new exhaust put on our cars. They are usually welded with a mig welder. It usually starts up to go home.

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post #11 of 14 (permalink) Old Jan 14th, 08, 10:08 AM Thread Starter
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Re: Welded and it wont start

Yes, Frank from Prodigy said he has never had this happen in 30 years. My luck it happens the first time. It can happen though.

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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post #12 of 14 (permalink) Old Jan 14th, 08, 01:48 PM
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Re: Welded and it wont start

Quote:
Originally Posted by Fred Ficarra View Post
Yikes! I've had two things welded, in-place, with a mig on my car. No damage. Scary. Oh no, three things. Lot's of older computer modules too. Everything was left as-is during the work. How do you guys 'isolate'?
I usually pull all the wires I can from electronic devices to decrease the number of interconnects they have. Each wire is another potential path for electricity to travel. When it comes to ignition, I'll pull all plug wires, and any power/ground wires I have running to it.
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post #13 of 14 (permalink) Old Jan 14th, 08, 04:03 PM
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Question Re: Welded and it wont start

Quote:
Originally Posted by prostreet69camaro View Post
The sad thing is we all go get new exhaust put on our cars. They are usually welded with a mig welder. It usually starts up to go home.
Thats true. Is disconnecting the HEI's wiring connector enough to protect it? In my case I think that's the only electronic component, since I don't even have a radio on my 68.

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post #14 of 14 (permalink) Old Jan 18th, 08, 04:13 PM
 
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Re: Welded and it wont start

i never disconnect anything when i weld on a car...i cant even see how it would cause damage...you arent adding improper voltage to anything by welding on it, or grounding something out, or anything like that...the welder provides its own ground and voltage...as long as you arent connecting your ground thru your ignition system, or cleaning your stinger on the ecm, you should be fine...(ofcorse, if i`m wrong, i would like to know i am, and why...)
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