<hr style="color: rgb(102, 102, 102);" size="1"> <!-- / icon and title --> <!-- message --> alright i got a 98 f-150 supercab 4X4 with the 5.4 in it she has 228000KM yes KM on it, and recently the check engine light keeps coming on up until this no problems what so ever

so i work at a garage we put it on the scanner and it says that bank 1 sensor 2 so i replace that o2 sensor

then it goes good for bout 3 days then it says that both banks rich we cleaned the EGR valve and checked the air filter and...

no both are good and not clogged so a week down the line guess what happeneds again!

the light came on again and hey bank 2 is rich now we are out of ideas i got a feeling it i have some bad injectors and i just replaced the plugs and cables at the end of october

please any ideas???? help me out

 

Welcome to the forum
What are the actual codes that you are getting?

 

0175 is the actual code it comes on about once a week

it came back today lol bank 2 rich???

 

anyone?? its a pain to clear codes 2 a week

 

yup P0175 we are all clueless on this any ideas????

 

Does it run well?
Ever try running any injector cleaner through it?

 

With 228000 km, you might want to check the rubber elbow on the back of the intake.

Just a quick thought! This is similar to the errors I was getting on my 97 F150 5.4L. I went the usual route of replacing all 4 O2 sensors and still had the rough idle and error codes.... I finally found a thread on this site to talked about a vacuum leak at the back of the intake. The rubber elbow off the back of the 5.4 intake is very close to the firewall and over time the heat will deteriorate the rubber at the elbow bend. This elbow is part of the PVC assembly coming from the valve cover. I had to use both hands to check the elbow because of the limited clearance. Sure enough the elbow basically fell off of the intake nipple. Once I replaced the elbow, no more error codes, idled normal, just out $$ on four O2 sensors that I probably didn't need to replace.

Just a thought you might want to climb up over the engine and check that elbow coming off the back of the intake. If I find the link to the earlier thread I will post it.

Hugger94
<!-- / message --><!-- no sigs except when logged in -->

 

Yep...that very well could be the problem. That exact same thing happened to my friends 99 ex cab 4x4, I mean EXACTLY the same thing.

 

Don't forget to check MAF sensor for correct voltage,as well as fuel pressure,drop and pressure regulator for possible cause of richness.

 

Welcome to the forum sunsetauto

 

I agree on checking the PCV line. Mine has busted twice on my truck.