wheelliftnpony

I just put plugs in my buddys 4.6 SOHC and it also had a code for dpfe sensor.. The missfire code is gone but still feels like its miss firing, it jerks when your riding the gas easy.. if you get on it hard it all go's away..

wheelliftnpony

and the plugs are gapped n i used dilectrical grease as well.. cuz i know they like to get water n stuff down in the holes..

99mustanggt

Sounds like a vacuum leakto me.Check all of your vacuum lines.Also if you live in a cold climate it could be one of your climate control lines.If the heater is on try turning it off and see if it goes away.Just something to try.

wheelliftnpony

aright thanks man.. ill try that cuz ya the heats always on up here.. Thanks

wheelliftnpony

More info.. Ok car only surges when the motor is warm dosent do it for the first min or 2 of driving, and I just replcaed the DPFE sensor it didnt do nothing... The code im getting is just about emission controls 1401 is the code.. Im lost on this and cant figure it out..

AmericanRicer87

what year is the car? coil on plug? might have one of those going out on ya.

ottos

I had the EXACT problem that you do. In fact i would bet that you got a popping exhaust noise during idle when this is going on, when the motor is warmed up. And the exhaust probably smells funny. And you have a rough idle.

Check out my thread and fix:
https://mustangforums.com/m_4511996/...tm.htm#4511996

wheelliftnpony

OK Update:, I dida KOEO and a KOER test today, Came up with 2 new codes. ones a transmission control switch out of range and the other is a cylinder head temp sensor out of range... The car only dose the surging between 1100-1500 rpm mostly in overdrive while cruising 30-50 mph.. You guys think this tranny sensor could be goin bad the control sensor ? I have no clue on this one..