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Old 12-31-2020, 09:38 AM #16
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Quote:
Originally Posted by clanofwolves View Post
I did check for vacuum leaks first thing visually as well as using starter fluid, none detected.

The O2 sensors are original as far as I know, but wouldn't they too throw a code in addition to the P0171?

I remove and clean the MAF every 20,000 miles and I just did it about 5K ago, but maybe it is an issue anyway?
O2 sensors don't always throw a code when they go bad. If your O2 sensors are original, I'd replace them. It's likely the issue causing your P0171 and even if it isn't, they are due to be replaced. You'll probably pick up a mpg or two (I did when I replaced mine due to a P0172 too rich code).

Good luck
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Old 12-31-2020, 11:12 AM #17
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Here is the data my Foxwell gives me at idle:



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Old 12-31-2020, 11:13 AM #18
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Quote:
Originally Posted by clanofwolves View Post
I did check for vacuum leaks first thing visually as well as using starter fluid, none detected.

The O2 sensors are original as far as I know, but wouldn't they too throw a code in addition to the P0171?

I remove and clean the MAF every 20,000 miles and I just did it about 5K ago, but maybe it is an issue anyway?
MAF sensor could be skewed and reading incorrectly even if it is clean. Same with the upstream oxygen sensor (air/fuel sensor). If it's readings are skewed, but it's still varying voltage you most likely won't set an oxygen sensor code.

FYI: Upstream oxygen (air/fuel) sensor tells the ecm the data necessary to adjust your fuel trims. The downstream oxygen sensor monitors catalytic converter efficiency.

Try to get live data after the engine has warmed up and the idle has dropped down to around 600 rpms +/-100 rpm
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Old 12-31-2020, 11:40 AM #19
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P0171 - System Too Lean Bank 1

Quote:
Originally Posted by clanofwolves View Post
Here is the data my Foxwell gives me at idle:




You need to repost the results after the engine is fully warmed up. Include rpm and TPS.

Try and switch your readings to American measurements if you can.


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Old 12-31-2020, 12:04 PM #20
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My unit's p0171 was caused by the rubber hose just before the metal intake, replaced with new toyota OEM and all was good.

In my experience, 02 sensors throw a p420....
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Old 12-31-2020, 01:07 PM #21
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Quote:
Originally Posted by 19963.4lsr5 View Post
You need to repost the results after the engine is fully warmed up. Include rpm and TPS.

Try and switch your readings to American measurements if you can.
Will do and will post.
Thanks!
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Old 12-31-2020, 04:41 PM #22
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At least with the preliminary data, not a vacuum leak and probably not a direct fuel problem. Most likely an aging sensor. Post the new data once you have it.
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Old 12-31-2020, 04:55 PM #23
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Quote:
Originally Posted by 19963.4lsr5 View Post
You need to repost the results after the engine is fully warmed up. Include rpm and TPS. Try and switch your readings to American measurements if you can.




This better? What's it tell ya?

...again, thanks in advance!
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Old 12-31-2020, 05:19 PM #24
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I would replace the oxygen sensors
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Old 12-31-2020, 05:22 PM #25
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P0171 - System Too Lean Bank 1

Here is mine from this afternoon after a drive to the grocery store and back, sorry itís upside down.



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Old 12-31-2020, 07:06 PM #26
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+1 on changing out the 02 sensors.

Any drivability issues with the check light engine on?
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Old 01-01-2021, 12:16 PM #27
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Quote:
Originally Posted by LittleCaesar View Post
+1 on changing out the 02 sensors.

Any drivability issues with the check light engine on?
I'm going with the upstream O2 and see what it does. It seems to drive an accelerate fine, but she has stalled every once in a while when at a light with the AC on.
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Old 01-01-2021, 02:54 PM #28
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I would save your pennies and get both, but definitely replace the upstream if money is tight.

Ever cleaned the TB/IAC?
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Old 01-01-2021, 03:10 PM #29
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I had this code right after I half-assed cleaning my MAF sensor. What I did was fully clean it and reset the ECU and it hasn't come back (that was months and a couple thousand kms ago). Not saying that it isn't the O2 sensor, by any means, but you may as well try and clean the MAF to see if that does anything before replacing parts. Probably best to clean TB/IAC while you're in there, too. good luck!
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Old 01-04-2021, 09:23 AM #30
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Quote:
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I would save your pennies and get both, but definitely replace the upstream if money is tight.

Ever cleaned the TB/IAC?
I will on the O2s... I do some seafoam cleaning of the TB and I spray cleaner into the IAC when I am cleaning the MAF (the right brass screw is removed with a vice grip as the first attempted removal found her not budging, haha). I haven't paid an overwhelming amount of attention to the IAC, save I just insure she moves easily.
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