01 explorer sport loss of power

[elward1790]

So im having issues which i thought was a mass air flow sensor but its gone way past that now. Its chugging really bad and has no power. Sometimes when i try to take off from a dead start it wont go foward for a second. After that it catches and accelerates but its only does that every now and then. So far i have put a new mfs and air filter, pcv valve, O2 sensors all four, all new vacuum lines, and last night i put on new upper and lower manifold gaskets and throttle body gasket. When i first cranked it i thought it was fixed. I got it in and drove it to town with awesome acceleration, no hesitation or anything. Until it got warm. Now it seems worse. I dont know what to do. Im a very capable mechanic but theres a few things that im not experienced in (technical data readings) but mostly i know my way around but i am lost. And i checked the cats too and they are good. Please help

 

[Turdle]

Have codes scanned and report back please.

 

[elward1790]

Have codes scanned and report back please.

So the codes that were popping up was 171 and 174 and occasionally a misfire cylinder 2 code. But since ive changed the intake manifold gaskets it’s only showing the misfire on cylinder 2. But i know its not the wire bc I switched it with a brand new one off my other explorer and its still popping up. Mew spark plugs by the way

 

[Turdle]

Could be a fouling fuel injector on cyl 2

 

[elward1790]

Would that cause the severe chugging

 

[swshawaii]

Rubber PCV elbow checked?
Very important to insect the bottom side of the elbow where fuel vapor contaminants collect.

P0171 & P0174 4.0L SOHC's Sport/Sport Trac

There are regular posts looking for answers to the P0171/P0174 DTC's. The 2001-2003 Sports and 2001-2005 Sport Tracs are legendary for throwing the codes together. Although there ARE instances where intake gaskets, among other issues, are the cause the overwhelming majority of these codes are...

www.explorerforum.com

 

[Zackie]

My sports having this same issue, I've done all that as well except the gaskets so far, Let me know if you find out your issue

 

[elward1790]

Yup and a new pcv valve as well

 

[elward1790]

Yup and a new pcv valve as well

So i just took a picture of my O2 sensors sitting at idle and this is what i got

 

[elward1790]

So i just took a picture of my O2 sensors sitting at idle and this is what i gotView attachment 441508

Does anyone know why that one would be different

 

[elward1790]

So the first picture is when i first started my truck. Everything looks ok (except bank 2 sensor 2). The second picture is after it warmed up and started missing and sputtering. If anyone knows the reason for this please help

 

[Pete Deering]

So the first picture is when i first started my truck. Everything looks ok (except bank 2 sensor 2). The second picture is after it warmed up and started missing and sputtering. If anyone knows the reason for this please help

View attachment 441509

View attachment 441510

What is engine coolant temperature? ECT

 

[elward1790]

186. Normal