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SN95 Cobras
Low RPM stumble/miss
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<blockquote data-quote="ForcFed93" data-source="post: 15621329" data-attributes="member: 24561"><p>I have the original 1997 date coded wires I could try. I have a set of FRPP 9mm wires on it now that have maybe 1k miles on them. There is absolutely no visual indication of arcing that I can see. One thing that I did do was pull individual plug wires off of the coil packs while it was running to try to isolate the misfire, but it seems like all that would happen would be a steady misfire with a secondary miss on all cylinders. I couldn't isolate a single cylinder that didn't have a secondary miss with the plug wire pulled.</p><p></p><p>Perhaps I'll try swapping wires back to OEM and see if that helps.</p><p></p><p>Also, to answer the other questions, I've also cleaned the MAF multiple times and the fuel filter also only has about 1k miles. The thing that's odd is that it ran good before I did all of the maintenance and after for quite a while (I say that, but realistically, it was probably 500 miles or so over 2-3 months).</p><p></p><p></p><p></p><p>I have a fuel pressure tester, but I don't have the adapter for the Ford rail. Any idea where I could pick one up? There is quite a lot of pressure at the valve just by pressing it and watching it gush, but I know that is not sufficient to tell me anything. Nothing abnormal about the priming cycle it all. Sounds 100% normal.</p><p></p><p></p><p></p><p>I wish I were more familiar with datalogging, but I'm not.</p><p></p><p>Also, it seems like everything I do has an effect, good or bad, but nothing resolves it.</p><p></p><p>Switching to the old OEM platinum plugs made it significantly worse. Switching to the MSD coilpacks made it slightly worse. Gapping the iridium plugs narrower didn't seem to affect it at all.</p><p></p><p>It seems like the problem is getting worse. And the fact that there are no codes at all is really getting on my nerves.</p><p></p><p>So where I'm currently at:</p><p></p><p>Switch plug wires back from FRPP to OEM.</p><p>Test fuel pressure to rule out pump/regulator.</p><p>MAF?</p><p>Take it to Ford to diagnose OR drive it off a cliff.</p><p></p><p>Both banks seem to behave very closely with one another so I'm leaning to something that affects the entire system, not just a single cylinder.</p><p></p><p>Edit: I could send you the log file if you have a means to view it. It's about 8 minutes long or so. Or the file converted to CSV.</p></blockquote><p></p>
[QUOTE="ForcFed93, post: 15621329, member: 24561"] I have the original 1997 date coded wires I could try. I have a set of FRPP 9mm wires on it now that have maybe 1k miles on them. There is absolutely no visual indication of arcing that I can see. One thing that I did do was pull individual plug wires off of the coil packs while it was running to try to isolate the misfire, but it seems like all that would happen would be a steady misfire with a secondary miss on all cylinders. I couldn't isolate a single cylinder that didn't have a secondary miss with the plug wire pulled. Perhaps I'll try swapping wires back to OEM and see if that helps. Also, to answer the other questions, I've also cleaned the MAF multiple times and the fuel filter also only has about 1k miles. The thing that's odd is that it ran good before I did all of the maintenance and after for quite a while (I say that, but realistically, it was probably 500 miles or so over 2-3 months). I have a fuel pressure tester, but I don't have the adapter for the Ford rail. Any idea where I could pick one up? There is quite a lot of pressure at the valve just by pressing it and watching it gush, but I know that is not sufficient to tell me anything. Nothing abnormal about the priming cycle it all. Sounds 100% normal. I wish I were more familiar with datalogging, but I'm not. Also, it seems like everything I do has an effect, good or bad, but nothing resolves it. Switching to the old OEM platinum plugs made it significantly worse. Switching to the MSD coilpacks made it slightly worse. Gapping the iridium plugs narrower didn't seem to affect it at all. It seems like the problem is getting worse. And the fact that there are no codes at all is really getting on my nerves. So where I'm currently at: Switch plug wires back from FRPP to OEM. Test fuel pressure to rule out pump/regulator. MAF? Take it to Ford to diagnose OR drive it off a cliff. Both banks seem to behave very closely with one another so I'm leaning to something that affects the entire system, not just a single cylinder. Edit: I could send you the log file if you have a means to view it. It's about 8 minutes long or so. Or the file converted to CSV. [/QUOTE]
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