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Old 02-14-2018, 01:04 PM   #25
Coley
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Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
Re: Sudden idle problem

Another way I do the 'bad plug or plug wire' test is to fully pull up all the protective wire 'grip boot's at the distributor on all the wires....but keep the plug wires inserted fully down into the distributor.
Then I use a simple light/12 volt tester (grounded to the firewall, etc) and touch it down into each of the (8 or 6?) distributor wire connection points.
Its easy to get in there with the 'pointy end' of the tester and essentially 'short' out that plug/wire. You can quickly work your way around the distributor several times.
If you find one that yields no change in the way the engine is running...then that wire or plug (or cylinder) is dead.
What I like about this method is the very limited chance of ever getting a shock by 'pulling' off wires then attempting to reinsert them.

....more food for thought.
'
Coley.
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1966 Chevy 1/2 ton (Florida- Red/white)
1972 Chevy 1/2 ton (California- Blue/white)
2005 Chevy Silverado HD2500/Duramax
2000 Dodge Ram 1500
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