Quick Check engine flash
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Joined: Jul 2006
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Quick Check engine flash
Tonight, found my self on a empty straight,smooth,road. Good chance to open up the engine a bit. 5.4 f25o by the way. Anyway, At just about 5k the tranny shifted and I noticed the Check Engine flash for a half second. Did it do this because I hit the rev limiter just before the tranny shifted? Engine is running fine but I am just wondering what it was.
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
The way the pcm updates and reads misfires will do this.
The crank position sensor measures actual acceleration and deacceleration of the the crankshaft tone wheel mounted on the cankshaft. any sudden change from what has been normal driving will update the misfire counters in the pcm.
Its normal
Rich
The crank position sensor measures actual acceleration and deacceleration of the the crankshaft tone wheel mounted on the cankshaft. any sudden change from what has been normal driving will update the misfire counters in the pcm.
Its normal
Rich
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