procharger Posted May 16, 2016 Report Share Posted May 16, 2016 I forgot to mention that when I was trying to find out what was wrong, I had all the plugs grounded to engine and did a lot of cranking on the engine until it got fairly slow and the battery got way down, but it still was firing which was surprising, it was turning way slower than I would have ever thought and still fired plugs at least the ones that were working. Link to comment Share on other sites More sharing options...
Tom Baker Posted May 16, 2016 Report Share Posted May 16, 2016 Just because they will fire in the open air doesn't mean that they will fire in the cylinder under pressure. I have seen many times a sparkplug fire in the tester until the air pressure is turned on, and then they don't fire. Link to comment Share on other sites More sharing options...
Anticept Posted May 16, 2016 Report Share Posted May 16, 2016 I've also seen the opposite. It's weird. Link to comment Share on other sites More sharing options...
procharger Posted May 17, 2016 Author Report Share Posted May 17, 2016 My point was engine was turning very slow yet it was still firing. Link to comment Share on other sites More sharing options...
Tom Baker Posted May 17, 2016 Report Share Posted May 17, 2016 My point was engine was turning very slow yet it was still firing. My point was if they were installed in the cylinder they might not have been firing, because of the compression. Link to comment Share on other sites More sharing options...
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