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2013-14 Shelby GT500
Won't pass readiness emissions test
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<blockquote data-quote="RedVenom48" data-source="post: 15956113" data-attributes="member: 166576"><p>My 2011 did the same thing. Completely stock when I purchased from Carmax with les than 15k miles on it. Would throw random multiple misfire codes and flashing CEL . When I would go to pull over, the codes and light would clear itself.</p><p></p><p>Was down for nearly 2 months at the Ford dealer. Same thing, Ford FTS on site to examine car. Data showed the car was misfiring even when idling perfectly. Ford FTS ordered a complete engine tear down. During removal of the balancer, tech noted that a washer was missing from the pulley. I believe it was either the friction washer behind the pulley or the washer behind the crank bolt.</p><p></p><p>Replaced and reassembled and *poof* like magic the car ran and has run flawlessly. The trigger wheel was sending a really weird signal to the PCM, which it interpreted as misfires. Likely was wiggling around due to insufficient clamping force.</p><p></p><p>Why yours shit the bed after a PCM swap, Im not too sure. Perhaps an updated calibration was in the new PCM that was much more sensitive to the data it was getting from all its input sensors.</p></blockquote><p></p>
[QUOTE="RedVenom48, post: 15956113, member: 166576"] My 2011 did the same thing. Completely stock when I purchased from Carmax with les than 15k miles on it. Would throw random multiple misfire codes and flashing CEL . When I would go to pull over, the codes and light would clear itself. Was down for nearly 2 months at the Ford dealer. Same thing, Ford FTS on site to examine car. Data showed the car was misfiring even when idling perfectly. Ford FTS ordered a complete engine tear down. During removal of the balancer, tech noted that a washer was missing from the pulley. I believe it was either the friction washer behind the pulley or the washer behind the crank bolt. Replaced and reassembled and *poof* like magic the car ran and has run flawlessly. The trigger wheel was sending a really weird signal to the PCM, which it interpreted as misfires. Likely was wiggling around due to insufficient clamping force. Why yours shit the bed after a PCM swap, Im not too sure. Perhaps an updated calibration was in the new PCM that was much more sensitive to the data it was getting from all its input sensors. [/QUOTE]
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2013-14 Shelby GT500
Won't pass readiness emissions test
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