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Keep in mind you are getting well meaning advice from all and at times conflicting opinions too.
Ex>The purpose of O rings in the tube. I stand by my view and PwrDude has his view. [conflict]
Ex> Oil in plug tube [not on the plug tip] will eventually give you misfire [all of us agree]
Why you are getting bad trim numbers [no one has the answer]
You can verify the connectors are good and the sensors are new and OEM. Further verify the wires are not chewed/ripped.
Beyond that, you might like to visit a mechanic to get a professional fix.
Well guys I’ve been driving this thing like I have no license because I hadn’t deemed it “up to par”. But today, I went to go get a wooden steering wheel from someone for $100(don’t know if that’s a rip off or what) and while on the highway I plug in my obd scanner just to see what was going on with fuel trims or if other codes popped up. I get this code:
. I was super confused because 1. Where was the p0171 and 2 what is this and is this even real
so as I had it plugged in im driving and I notice the CEL goes away and no I did not erase the codes I actually read the p0446 with no check engine . For a minute it was there before the engine erased it and then I tried again and “no codes to read”. So I guess driving her long distance is the trick? Lol. Idk. But I’m not entirely content, as it still rumbles a bit and drones at certain rpm’s, both of which happened at the same time, (maybe just normal from not being used) but also I hear a clicking sound with each turn of the engine, I think it has something to do with spark plug because when I changed it it got better and then worse again. Not sure but I feel like I’m being negligent if I don’t tackle it. It’s so minor I can only hear it reflecting from walls that the car is close to. I’m already feeling pretty accomplished, so don’t take my further questions for me being ungrateful. Haha, appreciate all of the continued help greatly, from everyone!
I will make no comment on spending money on accessorizing before having a proper working machine.
The ecu monitors and stores everything. The error condition has to occur persistently for the CEL to light up. While the accumulation is working, you get pending codes. Errors are added and removed and if they are not removed, they become set.
hey I will accessorize this thing broken or fixed, it is a hobby for me. but I know what you're saying
I think the machine is almost "fixed" though. I do hear lifter tick, anyone else have to deal with that? I suppose I will change engine oil again, but that only might temporarily resolve the issue. I dont know.
hey I will accessorize this thing broken or fixed, it is a hobby for me. but I know what you're saying
I think the machine is almost "fixed" though. I do hear lifter tick, anyone else have to deal with that? I suppose I will change engine oil again, but that only might temporarily resolve the issue. I dont know.
my bad was in a rush before. i say it is almost fixed but there is still p0171 and p0446. when I check monitors it says evap INC and oxygen sensor INC. should I just say screw it and replace bank 2 sensor 1?it behaves fine but I could get slightly better gas mileage and there's a rumble from the fuel trims being excited at idle. again, I have done the iacv cleaning, etc. should I start to look Into ocv? its only super minimal stuff but still will lead to other issues nonetheless.
my bad was in a rush before. i say it is almost fixed but there is still p0171 and p0446. when I check monitors it says evap INC and oxygen sensor INC. should I just say screw it and replace bank 2 sensor 1?it behaves fine but I could get slightly better gas mileage and there's a rumble from the fuel trims being excited at idle. again, I have done the iacv cleaning, etc. should I start to look Into ocv? its only super minimal stuff but still will lead to other issues nonetheless.
Maybe the P0446 indicates a vacuum leak that leads to a P0171?
Please check the manual of your obdII reader. There is yet another, quirk with ObdII, that it may return "not ready" or its equivalent, till enough cycles are performed in operation of the vehicle. I am leaning on the side that "inc" stands for incomplete information which would be the same as "not ready".
Maybe the P0446 indicates a vacuum leak that leads to a P0171?
this is what I think is part of the issue, I’m hoping the other part has to do with oxygen sensor but I doubt I would get fairly good highway miles with a bad o2 sensor, right? You never know though. It’s really just bad idle and the clicking sound, which I will get seafoam today and change my oil. Will let you know if that fixes it margate, it sounds rather loud though but can’t hurt to clean the engine.
Salim you’re probably right but it was able to pass inspection and then after, the CEL turned on it turned off with some driving so it led me to think that she’s running as expected , but not when I look at fuel trims idling.
You should do the treatment and let it do its work and then replace the oil to purge out the dislodged material as well as detergent. Do not use fresh oil and add the seafoam.
The P0446 can be triggered by a bad gas cap and other emissions vacuum lines near the gas tank.
Most common fault for P0446 is gas cap when no other codes are present.
However, the P0171 is a lean condition on bank 1.
AND, your last fuel trims posted showed fuel trims at +10%(Not Running Lean)- this means your lean condition is intermittent! lol
Intermittent faults can be the most frustrating and difficult cases to diagnose, especially when maintenance has been delayed.
Oh wait, it gets better... Haha
Your last fuel trims were showing Bank 1 fuel trims are in spec(not running lean) BUT bank 2 fuel trims are high and now running lean.
I'm really thinking you have a vacuum leak somewhere between the MAF and engine that's moving around or who knows! haha.
Until you do more tests, that's where I'm at, hopefully others have ideas too.
If you feel like it:
Need new fuel trims at idle, car is warm.
Need new fuel trims at 45 mph, cruise control on and vehicle speed is steady.
PS: MAF at idle should be near 3.0g/cm3, if I remember correctly.
As you can see- the VSV valves under the hood at the intake control the vacuum at the emissions near the gas tank(P0446) and this runs off engine vacuum.
I think the P0171 Lean Condition code and P0446 can be related- as posted above by @maxSteel
Posted in fair use for commentary and discussion.
Harbor freight, dirt cheap vacuum gauge.
I have one and it will let you know fast if you have a vacuum leak!
Easy to use, just T it on to a main vacuum line at the engine.
11-22-23, 08:00 AM
