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Old 04-19-2017, 07:00 PM   #1
MorrisBetter
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Momentary stumble after prolonged slow/stop/go

OK, I have an intermittent problem that occurs after driving in stop-n-go traffic.

After 10 minutes or more of stop and go, moderate throttle will cause a serious stumble. Feels like a lean misfire on several cylinders. It clears itself after a few (10-15) seconds, and the car returns to normal.

During the stop-n-go, everything seems normal. Smooth idle, no off-idle issues. No codes are saved, and after the event, there is no other signs of trouble.

Any ideas?
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Old 04-19-2017, 07:06 PM   #2
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Did this happen after a tune?
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Old 04-19-2017, 07:09 PM   #3
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Does it happen at a particular rpm, throttle position, or manifold vacuum...

Also, sometimes a bad MAF can make you feel like you hit a rev limiter.
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Old 04-20-2017, 03:35 AM   #4
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You are going to need to get a datalogger to try and see what is acting up in that particular scenario.
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Old 04-20-2017, 03:12 PM   #5
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Originally Posted by MuhThugga...View Post
You are going to need to get a datalogger to try and see what is acting up in that particular scenario.

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Old 04-22-2017, 01:02 PM   #6
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No recent tune or any other changes. It does feel like the rev-limiter, but is throttle pos related. Any attempt at moderate to hard acceleration after prolonged idle/slow driving will cause the problem.

I'm guessing that it might be a O2 sensor, but I'd rather not start throwing parts at the problem. I will if necessary.
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Old 04-22-2017, 01:16 PM   #7
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I doubt it's an o2 sensor. There are procedures to check your o2 anyhow...

Are you getting any kind of "safety mode performance reduced" warning?

Do you have any data logging device? I would look into muhthugga's advice and log it, with as many relavent PID's as you can...
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Old 04-27-2017, 04:23 PM   #8
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I would check the basics first: dirty plugs, filter, etc. I tend to overthink situations and they end up being something simple
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