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  #16  
Old 12-14-2015, 03:02 PM
GSF1200S GSF1200S is offline
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Join Date: Jun 2012
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Default Re: cyl 5 misfire and shudder at low rpm between 45-60 mph

Quote:
Originally Posted by RB7 Ranger View Post
Do a leak down on # 5
^^ this too if all else fails
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2002 Ford Ranger XLT Supercab, 2.3L Duratec I4, 5-speed manual, 4.10 gears, ~100,000 miles
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  #17  
Old 12-14-2015, 03:27 PM
Erock482 Erock482 is offline
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Default Re: cyl 5 misfire and shudder at low rpm between 45-60 mph

Im curious how this will go as well, i have an odd stumble thats so far refusing to throw me a code to check.
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  #18  
Old 12-14-2015, 05:52 PM
GLH GLH is offline
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Quote:
Originally Posted by Erock482 View Post
Im curious how this will go as well, i have an odd stumble thats so far refusing to throw me a code to check.
What engine ? How many miles ?
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  #19  
Old 12-15-2015, 10:14 AM
Erock482 Erock482 is offline
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Default Re: cyl 5 misfire and shudder at low rpm between 45-60 mph

4.0 177k
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  #20  
Old 12-15-2015, 11:01 AM
MJBROWN23 MJBROWN23 is offline
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Quote:
Originally Posted by GSF1200S View Post
I'm parroting the advice of others. Most people suggest turning it on for a period of time when the cable is disconnected; i would surmise it is either a signal to the pcm to clear fuel maps (and codes, etc), or somehow drains residual current stored in the vehicles electrical system. I would think however outside of possibly a few small capacitors in the pcm, there wouldnt be enough stored to require the headlights as a drain..

As long as the OP makes sure his fuel trims start from scratch, that's what matters.
Touch battery terminals together while disconnected from batt...drains all power from any and all capacitors.
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  #21  
Old 12-15-2015, 11:57 AM
GLH GLH is offline
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Quote:
Originally Posted by MJBROWN23 View Post
Touch battery terminals together while disconnected from batt...drains all power from any and all capacitors.
Not necessary.
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