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Old 04-03-2001, 11:56 PM
gdaley gdaley is offline
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Join Date: Feb 2001
Location: SE PA
Posts: 63
While I generally agree that Diagnosis By Replacement at the customer's expense is a poor business model (at least as viewed by the customer), it can be a very cost-effective technique if known good parts, like relays etc, are on hand at no cost to the mechanic to swap in and out. Additionally, methodical diagnosis can yield contradictory and confusing results when the basics are overlooked. I get nervous when people start talking expensive modules before they ask when the last ignition tune-up was.

I concur that the problem is likely a high resistance connection that was disturbed.
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