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Runs Great!... sometimes...


Guest Anonymous

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Guest Anonymous

So I turn to the best informed group of folks around in the hopes of laying this ghost to rest:

my '76 02 has a Crane XR 700 elec. ignition with the Crane coil (and ext. ballast). It's been on and running fine for 8 yrs. Recently, these symptoms:

1. very rough, low running idle, but only sometimes (thought this was fuel/vac. related, and cut new gaskets for leaking 32/36 carb/manifold. No change. Also cleaned all jets/float bowl)

2. I get spark that jumps approx. 3/8" when I put it to metal (is this a weak spark? How can you tell a weak spark?)

3. Car refused to start, leaving me stranded for 2 hrs. Even with a dousing of starter fluid, it did not even hiccup. When AAA got there with a trailer, I reached in psngr. window to crank one last time and... VROOOMM!

4. Troubleshot this week (checking spark jump again while it was running). Jump was sporadic, upped the idle, but still rough. Then car quit. Friend cranked car and I got NO SPARK JUMP at all, (#1 cyl) when I was getting it earlier. At high RPM, nice and smooth.

Q: Has anyone experienced erratic behavior from their Crane XR 700 or 3000 units? Can I troubleshoot the Crane unit somehow? Trouble shoot the light diode/chopper wheel? Do you think XR 700 is the culprit?

Q: Could it be a bad ground? Can anyone tell me where to check grounds for this type thing? (guage and turn signal oddities as well)

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Guest Anonymous

Check all your wiring to make sure that no wires have been rubbing against anything to remove the insulation. Check the connections/terminals to make sure none are loose. Finally, check the ignition coil.

shermanmartinez@hotmail.com

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Guest Anonymous

ah, yes, I should have mentioned, I did check the coil by bypassing the ext. ballast and hooking up my ol' Bosch Blue. Same results, so not the coil.

I just now tried to start and nothing. But then, I removed rotor and took sandpaper to rotor and cap contacts (which were not even corroded), reassembled and it started right up (although without the choke, it still runs rough). Any other takers on this ghost? Thanks for your input!

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Hi,

I have a Crane XR3000 that I have been using for a few months. My car runs fairly well, but I noticed some inconsistencies at idle. My carb isn't the greatest, so I assumed it was that.

Then, out of the blue, I thought to myself that maybe the ground for the Crane unit wasn't very good, so I pulled it off and made a nice, clean contact point on the body. It worked like a champ! The idle is now smoother and very consistent.

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Guest Anonymous

Thanks Colin,

I think I may do the same. Say, I see you are a prof. musician/studio engineer? Very cool. I am drumming/writing/singing/strumming for a living down here in Charlotte, NC. Nice to meet a kindred spirit! Continued success!!

Greg Lilley

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