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2013-14 Shelby GT500
performance problems after catch can install
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<blockquote data-quote="Husky44" data-source="post: 12333792" data-attributes="member: 142759"><p>Installed my Bob's Catch Can this evening. Backed the car out of the garage, left it idling while I ran to grab something out of my truck. Car was idling at high idle (cold start), then suddenly fell off to about 600 rpm and started stumbling badly. I jumped in, tapped the gas, and it hesitated, then jumped back up to normal throttle response, so long as I kept enough throttle to keep it above idle. Foot off the gas, and it would resume the 600 rpm stutter. Other thing I could notice was that A/F stayed pegged at 20 unless I wound it up to 3500 or more, then only dropped to 16. I hadn't watched this reading religiously, but from what I did observe, it tended to stay around 14, unless I let off after a hard pull, when it would briefly wind up to 20 then settle back down after a second or two to 14.</p><p></p><p>Drove it around the block to see if it would clear up, and it would run fine above about 1500 rpm, but would hesitate and miss if I let RPMs drop. Shut it off, and restarted (always works with computers!), and no change. </p><p> </p><p>Pulled back into the garage, bypassed the CC, and car ran fine. May have been a little rough at first startup, but essentially idled fine and A/F readings dropped to normal (as I described above) soon enough that I felt safe Togo for a drive. Did a 5 mile loop, car ran fine.</p><p> </p><p>Any ideas what happened? </p><p> </p><p>Air temp is around 36 degrees. All other gauges were normal. No change in fuel I was running. 2300 miles.</p></blockquote><p></p>
[QUOTE="Husky44, post: 12333792, member: 142759"] Installed my Bob's Catch Can this evening. Backed the car out of the garage, left it idling while I ran to grab something out of my truck. Car was idling at high idle (cold start), then suddenly fell off to about 600 rpm and started stumbling badly. I jumped in, tapped the gas, and it hesitated, then jumped back up to normal throttle response, so long as I kept enough throttle to keep it above idle. Foot off the gas, and it would resume the 600 rpm stutter. Other thing I could notice was that A/F stayed pegged at 20 unless I wound it up to 3500 or more, then only dropped to 16. I hadn't watched this reading religiously, but from what I did observe, it tended to stay around 14, unless I let off after a hard pull, when it would briefly wind up to 20 then settle back down after a second or two to 14. Drove it around the block to see if it would clear up, and it would run fine above about 1500 rpm, but would hesitate and miss if I let RPMs drop. Shut it off, and restarted (always works with computers!), and no change. Pulled back into the garage, bypassed the CC, and car ran fine. May have been a little rough at first startup, but essentially idled fine and A/F readings dropped to normal (as I described above) soon enough that I felt safe Togo for a drive. Did a 5 mile loop, car ran fine. Any ideas what happened? Air temp is around 36 degrees. All other gauges were normal. No change in fuel I was running. 2300 miles. [/QUOTE]
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2013-14 Shelby GT500
performance problems after catch can install
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