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SVT Shelby GT500
Lower RPM hesitation and RPM fluctuation
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<blockquote data-quote="tampasnake" data-source="post: 16522658" data-attributes="member: 183516"><p>This was the only picture I took of the first set of TR6 plugs. They all looked pretty much the same. There was anti-seize on the threads.</p><p>The car was originally tuned in June 2019. I don't drive the car that much but I drove it from Pa to Florida spring 2019. My brother was storing it for my while I was in Germany. Its probably got 3000 miles on it from the time it was originally tuned Jan 2019 to now when it started acting up. Pretty much the only times I drove it this year was to test and tune nights at the track. I would run 2-3 passes and drive it home. </p><p>I have checked the voltage a few times. 14.4 volts constant when running. I also cleaned the couple ground points. I was hoping for something like that after researching the issue. </p><p>I haven't run a compression test. It is something I'll have to add to the list of things to check. My assumption is if it was something mechanical the issue would be constant at all rpms and each time I start it. </p><p>In some of my experiments if I unplug the MAF the rpm doesn't fluctuate and will hold 1500 rpms. I also removed the air filter and taped a portion of the intake tube off which resulted in it going into limp mode. In limp mode it didn't fluctuate or hesitate.</p></blockquote><p></p>
[QUOTE="tampasnake, post: 16522658, member: 183516"] This was the only picture I took of the first set of TR6 plugs. They all looked pretty much the same. There was anti-seize on the threads. The car was originally tuned in June 2019. I don't drive the car that much but I drove it from Pa to Florida spring 2019. My brother was storing it for my while I was in Germany. Its probably got 3000 miles on it from the time it was originally tuned Jan 2019 to now when it started acting up. Pretty much the only times I drove it this year was to test and tune nights at the track. I would run 2-3 passes and drive it home. I have checked the voltage a few times. 14.4 volts constant when running. I also cleaned the couple ground points. I was hoping for something like that after researching the issue. I haven't run a compression test. It is something I'll have to add to the list of things to check. My assumption is if it was something mechanical the issue would be constant at all rpms and each time I start it. In some of my experiments if I unplug the MAF the rpm doesn't fluctuate and will hold 1500 rpms. I also removed the air filter and taped a portion of the intake tube off which resulted in it going into limp mode. In limp mode it didn't fluctuate or hesitate. [/QUOTE]
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SVT Shelby GT500
Lower RPM hesitation and RPM fluctuation
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