ddeford Posted February 17, 2010 Share Posted February 17, 2010 Here is a mystery. The car is an early 71 that is essentially stock, but I run a header and a Mallory dual point mechanical-only distributor. It starts great every morning and runs well for about ½ hour. Then I get a stalling effect. It is as if one turns the key off and then quickly back on. It happens once or twice at first but then gets more frequent as I go along. I had this problem before and replaced the positive and negative connectors at the coil and it went away. Now it is persistent. By the way, it only affects the engine – voltage does not drop, the lights do not dim, etc. when it occurs. Any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted February 17, 2010 Share Posted February 17, 2010 Bad coil (when it gets hot)? Quote Link to comment Share on other sites More sharing options...
ddeford Posted February 17, 2010 Author Share Posted February 17, 2010 I thought it was the coil intially but I replaced it with one of my spares and the problem persists. Quote Link to comment Share on other sites More sharing options...
zforce Posted February 17, 2010 Share Posted February 17, 2010 Sounds like the condenser is bad, make sure wiring is correct,power to coil should not be more than about 8 volts. Are you using mallory coil? It should come with its own ballist resistor that you must run in series with stock resistor. Quote Link to comment Share on other sites More sharing options...
ddeford Posted February 17, 2010 Author Share Posted February 17, 2010 I am running an MSD Coil and a stock ballast resistor. Quote Link to comment Share on other sites More sharing options...
zforce Posted February 17, 2010 Share Posted February 17, 2010 Do you have a volt meter handy ? Check the voltage with key in run postition, should be about 8 volts. I think the msd coil is also supplied with a ballist resistor too. I got fed up with points and put a pertronix in the mallory dizzy about 6 years ago,very clean installation pertronix ignitor comes with its own breaker plate for the mallory. The only thing I did was epoxy the trigger magnets in place instead of using the green tape thats starts to peel after awhile. Quote Link to comment Share on other sites More sharing options...
ddeford Posted February 17, 2010 Author Share Posted February 17, 2010 Thanks, zforce. I will check out the voltage. Does the Pertronix work with my tach? Do you have a part number for it? Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted February 17, 2010 Share Posted February 17, 2010 Thanks, zforce. I will check out the voltage. Does the Pertronix work with my tach? Do you have a part number for it? Or just do a search for the ZX Dizzy Swap. For $75-100 bucks you get better spark and wonderful reliability. Points are a bit silly when a better Datsun solution is so cheap, easy, better, and reliable. Quote Link to comment Share on other sites More sharing options...
zforce Posted February 17, 2010 Share Posted February 17, 2010 Yes the tach works, the pertronix functions just like points so the tach doesnt know the difference. Quote Link to comment Share on other sites More sharing options...
zforce Posted February 17, 2010 Share Posted February 17, 2010 It sounds like the car you have came with the mallory, if you were starting with nothing the zx dizzy is the way to go but since you got the mallory might as well use it. I got mine for 100.00 new in the 80's now they are like 600 bucks F that. Do you have the degree key that comes with the mallory ? this is cool, you can set your advance curve to whatever you want. Quote Link to comment Share on other sites More sharing options...
ddeford Posted February 17, 2010 Author Share Posted February 17, 2010 Yes I have the degree key and have played with the advance curve. At the risk o fbeing redundant, does the petronix work with the Mallory? Quote Link to comment Share on other sites More sharing options...
zforce Posted February 17, 2010 Share Posted February 17, 2010 Works perfectly, just remove mallory breaker plate and install pertronix breaker plate. Ignitor is rivited to the breaker plate, unlike the upgrade for stock points dizzy that installs like a set of points. Quote Link to comment Share on other sites More sharing options...
hoov100 Posted February 17, 2010 Share Posted February 17, 2010 Try a NEW coil just to be sure. or pull out your petronix kit from the dizzy and check everything over. Also on a hunch, check your cap and rotor for bluing where the coil wire contacts. Quote Link to comment Share on other sites More sharing options...
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