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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-17-2005, 04:04 PM   #1
Dbeck002
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Default She started running rich :(

On the way to school today i noticed the engine consumes twice as much as gas as usual, it took me half of an eighth of a tank to get to school now it takes a whole eighth to get there and another to get back, quarter tank??? i also noticed a huge drop in power, i was used to just touching the pedal and flying now i kinda have to wait, wtf!!!!!!??

why is she running so rich all of a sudden, this started today!

O2 sensors are less than a year old, fuel pressure is at 41-42 which is normal for me. i dont understand whats going on.
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Old 03-17-2005, 04:16 PM   #2
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Default RE: She started running rich :(

Maybe a vaccum cracked or fell off.Sounds like it might ba a vaccum leak.
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Old 03-17-2005, 04:19 PM   #3
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Default RE: She started running rich :(

Does it sound like you have a turbo all the sudden?
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Old 03-17-2005, 04:21 PM   #4
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Default RE: She started running rich :(

no it doesnt sound any different really,

but this morning i washed my filter and dried it with a blower and put it back on, could that have done anything to the MAF sensor? it idles ok though so i dont know if the MAF is involved... i really cant figure this one out.
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Old 03-17-2005, 05:07 PM   #5
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Default RE: She started running rich :(

I sprayed carb cleaner all over the engine bay and on the vacuum lines, idle didnt change. so i dont know why the car is running so rich, only thing i can think of are the O2 sensors malfunctioning, maybe the wiring under there came loose. i dont know what else it could be really.
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Old 03-17-2005, 05:12 PM   #6
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Default RE: She started running rich :(

Possible bad O2 sensor or sensors.There is a sensor somewhere making the computer give more gas.
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Old 03-17-2005, 05:14 PM   #7
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Default RE: She started running rich :(

hmm could it be the RTV sealant i used last month to install the manifold. maybe its not O2 sensor safe, but would it take a whole month to show up? i drove her every day for hours and this never occured...




i ran the codes


i got code 54, 31, 85

31 and 85 have been there for months, just EGR bull****.

code 54 is the new code its weird, the book says

"Vane air flow sensor or air charge temperature sensor"

straight from the haynes manual, i didnt know we had air charge temp sensors in the 5.0s. whats this mean?
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Old 03-17-2005, 06:04 PM   #8
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Default RE: She started running rich :(

i checked the MAF just now and the resistors are intact. it seems to work fine since the car idles ok and revs ok.

i am suspecting its the O2s, but what could have caused it?

if its the RTV sealant, than when i buy new sensors will this happen again? the sealant will foul those ones too... i dont want to have to reinstall the manifold with new sealant that would be a bish..
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Old 03-17-2005, 06:51 PM   #9
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Default RE: She started running rich :(

Dbeck, is on of your plugs or wires!
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Old 03-17-2005, 07:21 PM   #10
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Default RE: She started running rich :(

checked each plug, they are gapped fine. doesnt seem to be the plugs, thanks anyway though bobby [&:]


plugs look a little whitish though.
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Old 03-17-2005, 07:21 PM
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