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  #1  
Old 01-23-2013, 06:21 PM
stateranger stateranger is offline
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Default Missfiring at idle.

Hello everyone.

For the last three days my truck has been idling fairly rough and lacking power.The cel did come yesterday and was p171 lean condition.I cleared it and it hasnt come back.Today I did a vaccum leak test and sprayed all the lines and gaskets with wd40 and had no change.
I did a fuel pressure test 57psi engine running and off.
Ran live data and noticed the upstream o2 sensor running at .050 to .075 when it was running the worst then it varied between .95 and .05 when it smoothed out.this is every start(swapped out the o2). But no still no cel or pending codes.last week I did the full seafoam treatment ,cleaned the iac,and maf after changing the timing belt and recently changed plugs and wires.
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2014 F150 xl 3.7 6 speed auto.

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Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea

Last edited by stateranger; 01-23-2013 at 07:20 PM.
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  #2  
Old 01-24-2013, 08:27 AM
stateranger stateranger is offline
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Default Re: Missfiring at idle.

Really no one here.
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2014 F150 xl 3.7 6 speed auto.

Quote:
Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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  #3  
Old 01-24-2013, 09:02 AM
modelageek modelageek is offline
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Default

Quote:
Originally Posted by stateranger View Post
Hello everyone.

For the last three days my truck has been idling fairly rough and lacking power.The cel did come yesterday and was p171 lean condition.I cleared it and it hasnt come back.Today I did a vaccum leak test and sprayed all the lines and gaskets with wd40 and had no change.
I did a fuel pressure test 57psi engine running and off.
Ran live data and noticed the upstream o2 sensor running at .050 to .075 when it was running the worst then it varied between .95 and .05 when it smoothed out.this is every start(swapped out the o2). But no still no cel or pending codes.last week I did the full seafoam treatment ,cleaned the iac,and maf after changing the timing belt and recently changed plugs and wires.






Quote:
Originally Posted by stateranger View Post
Really no one here.
I read your posts. I am not sure what your issue is? That might be why no one responded. Do you have codes now?

One thing you do with the lean code is change the airfilter, check intake for blockage and remove and clean the MAF.

SFDROIDBIONICUT2
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #4  
Old 01-24-2013, 09:44 AM
stateranger stateranger is offline
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Default Re: Missfiring at idle.

Quote:
Originally Posted by modelageek View Post
I read your posts. I am not sure what your issue is? That might be why no one responded. Do you have codes now?

One thing you do with the lean code is change the airfilter, check intake for blockage and remove and clean the MAF.

SFDROIDBIONICUT2
Did all of the adove. I have two pending codes now p1506 iac over speed and p0171.I think my iac may be bad.

Thanks for the response.
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2014 F150 xl 3.7 6 speed auto.

Quote:
Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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  #5  
Old 01-24-2013, 01:52 PM
stateranger stateranger is offline
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Default Re: Missfiring at idle.

Well I solved it. All I had to do was give it chevron and it stopped cryin.
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2014 F150 xl 3.7 6 speed auto.

Quote:
Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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  #6  
Old 12-09-2014, 10:50 AM
stateranger stateranger is offline
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Default Re: Missfiring at idle.

The issue ended up coming back after a hundred miles, I checked the live data readout on my scanner and noticed the maf reading was very inconsistent, I rechecked the air box and saw a piece of tape hanging in front of the sensor. I removed the tape and replaced the sensor because it got damaged.
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2014 F150 xl 3.7 6 speed auto.

Quote:
Originally Posted by pk9298 View Post
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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