Idling Problem / Constant Repairs - 05’ 4.0L V6
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
Likes: 6
Idling Problem / Constant Repairs - 05’ 4.0L V6
I have recently got an oil change and replaced the following:
- E3 Spark Plugs
- Motorcraft Fuel Filter
- Air Filter
- Spark Plug Wires
- Coil
- EGR Valve
- Fuel Pressure Sensor
And even bought some mass air flow cleaner and cleaned my MAF sensor and the car still idles very rough and I have the following codes:
- P0305 Cylinder 5 Misfire
- P0108 Barometric Sensor Circuit High Input
- P0171 Fuel System Too Lean (Cylinder Bank 1)
- P0174 Fuel System Too Lean (Cylinder Bank 2)
- P0182 Fuel Temperature Sensor A Curcuit Low Input
- P0193 Fuel Rail Pressure Sensor High Input
- P0300 Random Misfire
- P0305 Cylinder 5 Misfire
- P0193 Fuel Rail Pressure Sensor High Input
- P0300 Random Misfire
- E3 Spark Plugs
- Motorcraft Fuel Filter
- Air Filter
- Spark Plug Wires
- Coil
- EGR Valve
- Fuel Pressure Sensor
And even bought some mass air flow cleaner and cleaned my MAF sensor and the car still idles very rough and I have the following codes:
- P0305 Cylinder 5 Misfire
- P0108 Barometric Sensor Circuit High Input
- P0171 Fuel System Too Lean (Cylinder Bank 1)
- P0174 Fuel System Too Lean (Cylinder Bank 2)
- P0182 Fuel Temperature Sensor A Curcuit Low Input
- P0193 Fuel Rail Pressure Sensor High Input
- P0300 Random Misfire
- P0305 Cylinder 5 Misfire
- P0193 Fuel Rail Pressure Sensor High Input
- P0300 Random Misfire
Mach 1 Member
Joined: August 28, 2005
Posts: 626
Likes: 16
From: Winnipeg Mb. Ca
Were these codes there before you did all this work? If so Clear all codes and start again. Also recheck and make sure you reconnected any sensor connectors you removed to do your repairs. List the codes here again.
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
Likes: 6
So far no codes have came up, I have bought a cold air and was running okay but sometimes ran rough such as idle and misfire from running too Lean, now I put my stock one back on today and my car is a little better, went from 12-13 to 15 mpg but the car idles at park under the 0 and when I go to turn my car off, the gauge needle tries to force itself down to it ticks and shakes 3 times
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
Likes: 6
Actually that’s what I was going to ask earlier if anyone knew what hoses would lead to and cause a car to idle? And where are the most common places to check, btw when I have my intake off, my throttle body was relatively clean so that’s one issue marked off and I bought two O2 sensor replacements and installed a couple days ago and it helped the issue but still idles rough
Mach 1 Member
Joined: August 28, 2005
Posts: 626
Likes: 16
From: Winnipeg Mb. Ca
I don't know much about the v6 but you might want to try these two tests. Seems like a couple of common vacuum problems with the 4.0l.
http://troubleshootmyvehicle.com/for...d-P0174-page-3
page 1 and 2 also have some good info.
http://troubleshootmyvehicle.com/for...d-P0174-page-3
page 1 and 2 also have some good info.
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
Likes: 6
I checked out the link and will do that tomorrow when my car cools down and may possibly put my old spark plugs back in because I got the E3 sparks but people talked about the gap concern could cause a misfire but I doubt it with the e3 because people on here have had goodluck with them and plus my car was running amazing when I installed them then a week down the road everything started to go wrong
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
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Update, my car was getting 13ish to the gallon wit the cold air and now it went down to 11 to the gallon with the stock one back on. yesterday I was driving and it was hot outside, my car every time I pushed down the pedal, my car would shake and feel very sluggish like there is a **** ton of fuel being dumped as if my car is drunk or a heavy drinker but when I go full foot down to make the revs higher, then it balances it self out again and then it goes back to that weird feeling but right now it’s cold (6:37 Am) and no problems, I mean a few little idles here and there but runs better...?
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
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So my idle goes below the very first tick or dash on the gauge... well okay basically when the car is off, where the needle sits at, when running and warmed up, the cars needle is below the position when off and it bounces around there, I heard that a battery and alternator could cause a 05 mustang 4.0 to idle very bad? Is this true
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
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The car has jba headers, and had a sct badge on the dash but I took it off and I also disconnected my negative and my whole battery sometimes to clear the engine light and people said if it did have a tune then that would erase it
Legacy TMS Member
Joined: January 25, 2010
Posts: 3,969
Likes: 1,663
From: Massachusetts
It will be very hard for use to help you sort this out because it sounds like there might be a lot more to this story.
Thread Starter
V6 Member
Joined: December 21, 2017
Posts: 88
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I put my stock one back on, and it still had the problems before the cold air, I decided to put 87 vs 89 which I usually get but just wanna test it because when I put a different octane my car feels weird right away with the mixture and then balances it self out