1998 2.4l SR5 air sensor problems

I was getting PO 171 and PO125, plus a second PO171 code. The exhaust manifold has been replaced, vaccuum checked and I installed a new MAF sensor. I still have the 2 PO 171 codes, PO125 is gone at least for now. I did clean the throttle body without removing it from the engine. Not sure what to do next? Pay for more diagnostics, replace the sensors or?? Any advice will be greatly appreciated.

 

Anyone?

 

FF changed?

to make sure no more V leaks in intake system, with engine running use cholrinated brake cleaner/carb cleaner and spray on gaskets/hose joints.....if engine revs...there is your leak

 

as far as fuel injectors....with 3rz....visually make sure they are all seating well in black injector cups

 

Same for 2rz I assume? Also I had it smoke tested for vacuum leaks and they said there were none
I

 

In layman’s terms….yeah the same
(There are differences but other seasoned members can list them)

a firm on smoke test…..that knocks out 2 of the 4 check points

Mine at 212k….was original

 

My issue turned out to be injectors
But
No codes only hot no start situation (different than your issue TG)

our injectors sit in plastic cups that are pressed in by hand into the head. mine were brittle as glass. I replaced them as others recommended.
Very possible that injector cup(s) cracked, letting in un monitored air.
1st things first thou
Check FF

 

Fuel filter was changed 60k miles ago, I probably should just replace it.

 

Dang.
I would say change FF
But my hands were swollen for 2 days after the PITA install….I would not be looking forward for tht job again

as best u can
Visabley inspect how injectors seat
U can use tht brake clean method as well (only on injectors)
How many miles?

 

170k miles, what do you mean by PITA?

 

Pain in the ass…..well was for me
1st or 2nd maintenance job when I got my taco

that’s low miles!

 

HA HA, I don't do acronyms very well . I hired it done last time, the guy came here and didn't have too much trouble, I may hire it done again. The manual says to remove the intake but he worked underneath it.

 

The back of my hands looked like I was picking cotton for 2days
Real tight area
Can be done

 

Hey
U know what
Better ask you b4 a lot of people do….

AM or OEM MAF be sensor?

 

I asked on here Hitachi was recommended that's what I got.

 

do you have a scan tool?

 

No scan tool, just a OBD2 tool, that's not the same as a scan tool is it?

 

Maybe, some tools just scan, others perform test and read data. What we are trying to determine is is the issue a weak fuel pump, vacuum leak or something else. High mileage on 23 year old injectors and maybe a underspec fuel pump, it is a tough call. You have replaced the MAF but is that reporting the correct amount of air, need a scan tool capable of that measurement.

The P0125 code needs to be addressed too. All the parts that could be put on the truck to "fix" the P0171 are wasted if the PCM never enters closed loop.

 

Is there a scan tool that works without a phone? (I don't have one as there is no service where I live). I have seen one used but never used one, I don't know much about them, what should I get?

 

Yes there are... how isolated are you? The reason I ask is that I am hesitant to have someone spend money for something that an autoparts store could do for free. Having said that, I have never used the following tool, Zurich ZR8S from Harbor Freight but it seems to be an adequate tool for the price... the more you pay the more you get but the question is how much tool do you need right now and for future needs? If others have a better/cheaper tool that does not require a cell phone, chime in please.