1981 chevy truck HEI ignition problems - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-25-2006, 09:01 AM
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1981 chevy truck HEI ignition problems

Within the last couple of months when ever I go over a speed bump or a small dropoff my engine shuts off. I have got under the hood & jiggled & unplugged the wires from the base of my distributor (control module wires?) that lead up to the top of the distributor where it plugs into the distributor cap & after tinkering w/that it would start until another speed bump down the line.Mylast bump I couldnt do that .I put on a new cap &coil, nothing. The time it did this before I checked & had power leading up to the distributor again jiggled the wires & it started but not this time. any help or suggestions would be appreciated. Thanks & I hope all of you have a merry x-mas!!

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Old 12-25-2006, 09:32 AM
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Quote:
Originally Posted by Brad Wiley
Within the last couple of months when ever I go over a speed bump or a small dropoff my engine shuts off. I have got under the hood & jiggled & unplugged the wires from the base of my distributor (control module wires?) that lead up to the top of the distributor where it plugs into the distributor cap & after tinkering w/that it would start until another speed bump down the line.Mylast bump I couldnt do that .I put on a new cap &coil, nothing. The time it did this before I checked & had power leading up to the distributor again jiggled the wires & it started but not this time. any help or suggestions would be appreciated. Thanks & I hope all of you have a merry x-mas!!
It could be the reluctor ring pickup coil that hooks to module, sometimes the wire will break inside the insulation and it will not fire or be intermittent,like a carb not taking fuel. Especially if it is vacuum advance style.
I just unplug the thing from module and slightly tug on each wire and if its broke inside insulation the insulation will stretch and you can see it stretch or it will break at that point.
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Old 12-25-2006, 02:01 PM
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dgcantrellsr thanks for the info I took the distributor apart today & couldnt find any faulty wires inside the dist., I have power to the distributor but nothing coming out agian thanks, have a merry x-mas
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Old 12-29-2006, 12:26 PM
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Doc here,

Pull the cap coil cover, look for damaged or broken wire feeds to the terminals to the cap. remove the coil and inspect the carbon rotor element for broken tip or runout (will be apparent by carbon being sprayed around the inside of the cap) ..replace as needed.

Check the plug for tight fit and be sure the pins are not burned or corroded burnish until shiny, and carefully bend the spring ends of the pins outward.

While in the coil cover, check the ground wire (it runs between the BATT and TACH wires) it is not unusual for this ti arc-over and short (I always put heat shrink on mine when replacing)

If that does not cure the problem, test the coil, it may be on the way out. With a DVOM, set to ohms, RX1, calibrated to 000,measure the primary, (BATT wire to the TACH wire) it should read LESS than an ohm, but more than 000, if not toss it it's shot..

Then measure the secondary, BATT to Carbon pickup, Set your scale to RX10k or higher..it should read between 6000 and 30,000 ohms..if outside if that range toss it it's shot.

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