Cold running?
Thread Starter
GT Member
Joined: August 28, 2014
Posts: 132
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Cold running?
Is it just my 2013 5.0 GT that runs like poo when cold or do most stock 5.0 V8's run this way? I'm talking about the bucking and sort of weird erratic rough running when cold. My car idles fine but at times I find it better to start out in second gear (MT) then dealing with the odd behavior in first. Also will a tune improve the cold running drivability?
Mach 1 Member
Joined: March 10, 2014
Posts: 564
Likes: 0
From: Manchester, NH
Is the car modified at all? All cars have a closed loop and open loop program. When cold the car operates in open loop. It will hit closed loop at about 140 degrees operating temperature. I would suspect something like a vacuum leak or an egr issue due to the rough running when cold in open loop. If it runs fine in closed loop the the PCM is compensating for some abnormality.
Other possibility is your PCM needs an update.
Other possibility is your PCM needs an update.
Thread Starter
GT Member
Joined: August 28, 2014
Posts: 132
Likes: 1
Is the car modified at all? All cars have a closed loop and open loop program. When cold the car operates in open loop. It will hit closed loop at about 140 degrees operating temperature. I would suspect something like a vacuum leak or an egr issue due to the rough running when cold in open loop. If it runs fine in closed loop the the PCM is compensating for some abnormality.
Other possibility is your PCM needs an update.
Other possibility is your PCM needs an update.
Mach 1 Member
Joined: April 13, 2014
Posts: 772
Likes: 25
From: Indiana
My buddy has a stock 2012 that suffers from this and he was told is the crank positioning sensor. He hasn't messed with it since it's warmer now, but I would think it would do it all the time if it wad that sensor.
V6 Member
Joined: May 15, 2014
Posts: 68
Likes: 5
And from what I have seen the timming goes to zero when it happens so it might be the crank sensor.
Last edited by Slowb00st; May 1, 2015 at 05:25 PM.
Super Boss Lawman Member
Joined: January 17, 2006
Posts: 4,148
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From: Temecula,CA
I usually just shift to second real quick when taking off from home and go light until I get to the main road
Last edited by SONICBOOST; May 2, 2015 at 04:31 PM.
Bullitt Member
Joined: April 18, 2013
Posts: 383
Likes: 1
Is it just my 2013 5.0 GT that runs like poo when cold or do most stock 5.0 V8's run this way? I'm talking about the bucking and sort of weird erratic rough running when cold. My car idles fine but at times I find it better to start out in second gear (MT) then dealing with the odd behavior in first. Also will a tune improve the cold running drivability?
Member
Joined: April 30, 2015
Posts: 1
Likes: 0
From: minnesota
Is the car modified at all? All cars have a closed loop and open loop program. When cold the car operates in open loop. It will hit closed loop at about 140 degrees operating temperature. I would suspect something like a vacuum leak or an egr issue due to the rough running when cold in open loop. If it runs fine in closed loop the the PCM is compensating for some abnormality.
Other possibility is your PCM needs an update.
Other possibility is your PCM needs an update.
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