19963.4lsr5
New member
Here are my images of some warmed up idle parameters.
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P0172 after fuel injectors.
- Thread starter Bucket81
- Start date
Bucket81
New member
Yes original alternator.
[MENTION=99144]19963.4lsr5[/MENTION]
Thanks for the the photos. I'll record new data and compare.
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19963.4lsr5
New member
Key on engine off is a good way to test the TPS without worrying about over reving the engine.
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Bucket81
New member
Well I tested it with my foot off the peddle it shows 9.4% and goes to 74.5 at WOT. I also looked at the numbers and everything look similar to mine but the RPM Wich is at about 1200 at idle.
19963.4lsr5
New member
mysunroofworks
Member
Any luck with a fix for this? Just replaced my 300k injectors and the car went from a long term P0171 to immediate P0172! :redbrick:
Maintenance done:
New injectors (aisin)
New Valve cover gaskets
cleaned IAC and throttle body
Couple of new vacuum hoses
Cleaned MAF (the correct way)
New PCV around 5 months ago
New fuel pump 3 years ago
Swapped MAF with a previous no code Runner around 2 years ago
Maintenance done:
New injectors (aisin)
New Valve cover gaskets
cleaned IAC and throttle body
Couple of new vacuum hoses
Cleaned MAF (the correct way)
New PCV around 5 months ago
New fuel pump 3 years ago
Swapped MAF with a previous no code Runner around 2 years ago
When's the last time the oxygen sensors were replaced?
mysunroofworks
Member
Both change in 2017, it certainly could be time again. Car had about 230k-240k on the clock when I changed them. Probably wouldn't hurt to change again...
gamefreakgc
Elite Member
Aisin didn't make injectors for Toyotas, they are all made by DENSO. It's possible you got aftermarket knock offs. How much did you pay for them?
mysunroofworks
Member
My apologies, just saw this..
You're correct, not Aisin, I just assumed...
$70 for the pack
ENA 2 Hole Fuel Injector 23250-62040
Pack of 6 Compatible with 1999-2004
Toyota 4Runner Tacoma Tundra 3.4L V6
There might have been a bad one in there...
Just because I'm at 300K/mi. and It's only a couple of hundred in parts and good peace of mind, I replaced:
Plugs and wires (recommended NGK and Denso)
I replaced both upstream (A/F) and downstream (O2) sensors with Denso parts from Camelback
New Fuel Pressure Regulator from Camelback
I swapped in a junkyard MAF (same part #) and it threw a P1133 code, swapped back to my original and the P0172 returned
Found my carbon canister had a HUGE crack in it, replaced that with a used on I had. I'll take some datalogs off Torque Pro tomorrow..
And of course I cheaped out on the injectors :rofl:
$70 is pretty cheap for fuel injectors. You get what you pay for with those so my bet is those are your issue. I'd recommend getting a set from the junkyard and getting them cleaned/tested or just replace with a quality set of rebuilt injectors.
The code says bank 1, but that's because we only have 1 bank of oxygen sensors. It doesn't mean it is coming from a specific bank of the engine.
spartacus
Senior Member
o
bank one is easier to get to for checking if the injectors are functioning properly.
Bank 1 = Cylinders 1,3,5 and Bank 2 = Cylinders 2,4,6 on a V6.
edit: bank 1 sensor 1 upstream o2 sensor, bank 1 sensor 2 downstream.
bank one is easier to get to for checking if the injectors are functioning properly.
Bank 1 = Cylinders 1,3,5 and Bank 2 = Cylinders 2,4,6 on a V6.
edit: bank 1 sensor 1 upstream o2 sensor, bank 1 sensor 2 downstream.
Last edited:
Just wanted to make sure people knew that the code does not know the difference between which bank of the engine is running rich or lean.
The Cold War Kid
New member
tps
Just changed the injectors - el cheapo but original - and she runs better than she ever has. P0172 began. Pulled tps and, sure enough, 1 of the 2 circuits was open. Asian replacement on the way. Last one worked for 20 years
Just changed the injectors - el cheapo but original - and she runs better than she ever has. P0172 began. Pulled tps and, sure enough, 1 of the 2 circuits was open. Asian replacement on the way. Last one worked for 20 years
Sorry for bumping a year old thread guys...I know...newb mistake...
Been reading thru a ton of threads on this P0172 as I'm fighting my own. Reading the last post about the TPS being the fix. Did you have any symptoms of a failed TPS or was it only obvious doing a resistance check?
I've got some other REALLY wonky stuff on mine related to the P0172, already checked/addressed the usual suspects, but ECU readings are confusing me, as an experienced diagnostic tech but new to the Toyota world. I would like to start a new thread but can't just yet apparently.
Been reading thru a ton of threads on this P0172 as I'm fighting my own. Reading the last post about the TPS being the fix. Did you have any symptoms of a failed TPS or was it only obvious doing a resistance check?
I've got some other REALLY wonky stuff on mine related to the P0172, already checked/addressed the usual suspects, but ECU readings are confusing me, as an experienced diagnostic tech but new to the Toyota world. I would like to start a new thread but can't just yet apparently.
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