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mysterious misfire

Old October 29th, 2014, 10:33 PM
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mysterious misfire

1995 Oldsmobile 3.4 l V-6 Mysterious misfire. Started intermittent. new plugs, wires coil pack, camshaft positioning sensor, now no codes or check engine light but runs on 5 cylinders and four when on the highway unless I back of on accelerator. Number 1 cylinder has no spark but coil pack seem ok Lost for options to try

tim
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Old October 30th, 2014, 02:04 AM
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It's entirely possible some of your new parts may be faulty.
First job is to trace back to why you have no spark at #1. Substitute the plug, then the wire, then the coil pack, unless the coil pack has a faulty supply it can only be one of these three. Do it one at a time or you won't know which is the faulty item.
Before you start taking things off, if you can lift the hood and run the engine in the dark, this will show up any tracking, that is arcing between the coils and the plugs. if you see this phenomenon you will save yourself some work because you will have identified the fault.


Welcome to CO btw.


Roger.
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Old October 30th, 2014, 05:57 AM
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Here is a pretty good article on diagnosing this type of ign. Sys.
http://easyautodiagnostics.com/gm/3....l-pack-tests-1
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Old October 30th, 2014, 07:08 AM
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No power to the #1 plug would suggest a fault,with the coil pac you replaced. Put the old one back on and see if that changes the situation. Replacing everything all at once makes diagnosis harder to do.
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Old October 31st, 2014, 04:57 PM
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Thank you so much guys. Finding the problem in the spark plug wire
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