99 Lincoln Towncar 4.6l, VIN 1LNHM81W8XY
Vehicle came in to shop Thursday with a P0307 and P0420. I connected my Solus Ultra 11.4 and verified a dead cat on bank 1, but when I tried checking the misfire using the cylinder contribution test I found something odd. The code pointed to cylinder #7 but the data showed cylinder #4 was misfiring. Long story short after swapping coils and disconnecting injectors I came to the conclusion that the data for cylinder #4 and cylinder #7 are mixed up. When I disconnect #7 injector, The data shows a cylinder #4 miss. And when I disconnect #4 injector, The data shows a cylinder #7 miss. Friday my Snap on rep showed up and I got my Ultra updated to 12.2, I mentioned the glitch and he advised me to contact Snap on with my findings. So here I am. But here's the kicker. The customer came back on Monday for the catalytic. After the repair, for giggles, I hooked up my Ultra which is now updated to 12.2 and pulled the #7 and #4 injectors while doing the cylinder contribution test and sure enough the glitch is still there. The data for #7 and #4 is mixed up in 12.2 also. I didn't take the time into checking if other cylinders are swapped but they could be. I'm very sure I entered all the right info when building the car for the scanner too. I'm not sure if Snap On monitors this forum so I guess this is some friendly FYI to other techs so they don't waste their time chasing the wrong cylinder. Oh it was a bad #7 coil that caused the P0307.
Vehicle came in to shop Thursday with a P0307 and P0420. I connected my Solus Ultra 11.4 and verified a dead cat on bank 1, but when I tried checking the misfire using the cylinder contribution test I found something odd. The code pointed to cylinder #7 but the data showed cylinder #4 was misfiring. Long story short after swapping coils and disconnecting injectors I came to the conclusion that the data for cylinder #4 and cylinder #7 are mixed up. When I disconnect #7 injector, The data shows a cylinder #4 miss. And when I disconnect #4 injector, The data shows a cylinder #7 miss. Friday my Snap on rep showed up and I got my Ultra updated to 12.2, I mentioned the glitch and he advised me to contact Snap on with my findings. So here I am. But here's the kicker. The customer came back on Monday for the catalytic. After the repair, for giggles, I hooked up my Ultra which is now updated to 12.2 and pulled the #7 and #4 injectors while doing the cylinder contribution test and sure enough the glitch is still there. The data for #7 and #4 is mixed up in 12.2 also. I didn't take the time into checking if other cylinders are swapped but they could be. I'm very sure I entered all the right info when building the car for the scanner too. I'm not sure if Snap On monitors this forum so I guess this is some friendly FYI to other techs so they don't waste their time chasing the wrong cylinder. Oh it was a bad #7 coil that caused the P0307.
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