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SVT Shelby GT500
No codes but misfires showing under general misfire monitor
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<blockquote data-quote="lfgt" data-source="post: 16295889" data-attributes="member: 196111"><p>I recently started using a bluetooth obd2 scanner (OBDLinkMX+) in conjunction with their app so I can see the different sensors and pids in real time (This app seems similar to Torque). There is a pid that shows 'Total Number of Misfires' and have only started looking at it the last 2 driving sessions. This afternoon it showed 6 total misfires after a quick 20 minute drive. No codes were thrown and car ran fine showing no symptoms of a misfire. </p><p></p><p>I looked at the data under MODE $06 were you can see misfires for individual cylinders and all were clear. But under 'Misfire Monitor General Data' there was this:</p><p></p><p>[ATTACH=full]1601192[/ATTACH]</p><p></p><p>I have found this info on another forum for the id's</p><p></p><p>Monitor ID: $a1; Test ID $80 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 200 revolutions)". This is continuously monitored by the PCM's misfire status monitor. </p><p></p><p>Monitor ID: $a1; Test ID $81 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 1000 revolutions)". This is continuously monitored by the PCM's misfire status monitor. </p><p></p><p>Monitor ID: $a1: Test ID $82 is the "Highest catalyst-damage misfire and catalyst damage threshold misfire rate (updated when DTC set or clears). </p><p></p><p>Monitor ID: $a1: Test ID $83 is the "Highest emission-threshold misfire and emission threshold misfire rate (updated when DTC set or clears) </p><p></p><p>Monitor Id: $a1: Test Id $84 is "Inferred internal catalyst mid-bed temperature" This is a calculated value - not taken from an actual sensor. </p><p></p><p>Has anybody encountered this before? </p><p></p><p>I am running no cats the spark plugs are fresh with probably around 1000 miles on them. The previous time I drove the car it showed 0 misfires. The only thing that has changed is the fuel. I will run this tank down and switch back to what I was using before to see if it changes.</p></blockquote><p></p>
[QUOTE="lfgt, post: 16295889, member: 196111"] I recently started using a bluetooth obd2 scanner (OBDLinkMX+) in conjunction with their app so I can see the different sensors and pids in real time (This app seems similar to Torque). There is a pid that shows 'Total Number of Misfires' and have only started looking at it the last 2 driving sessions. This afternoon it showed 6 total misfires after a quick 20 minute drive. No codes were thrown and car ran fine showing no symptoms of a misfire. I looked at the data under MODE $06 were you can see misfires for individual cylinders and all were clear. But under 'Misfire Monitor General Data' there was this: [ATTACH=full]1601192[/ATTACH] I have found this info on another forum for the id's Monitor ID: $a1; Test ID $80 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 200 revolutions)". This is continuously monitored by the PCM's misfire status monitor. Monitor ID: $a1; Test ID $81 is the "Total Engine Misfire Rate and Catalyst damage misfire rate (Updated every 1000 revolutions)". This is continuously monitored by the PCM's misfire status monitor. Monitor ID: $a1: Test ID $82 is the "Highest catalyst-damage misfire and catalyst damage threshold misfire rate (updated when DTC set or clears). Monitor ID: $a1: Test ID $83 is the "Highest emission-threshold misfire and emission threshold misfire rate (updated when DTC set or clears) Monitor Id: $a1: Test Id $84 is "Inferred internal catalyst mid-bed temperature" This is a calculated value - not taken from an actual sensor. Has anybody encountered this before? I am running no cats the spark plugs are fresh with probably around 1000 miles on them. The previous time I drove the car it showed 0 misfires. The only thing that has changed is the fuel. I will run this tank down and switch back to what I was using before to see if it changes. [/QUOTE]
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No codes but misfires showing under general misfire monitor
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