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3rd gen T4Rs
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https://www.toyota-4runner.org/3rd-gen-t4rs/)
| aa010175 |
12-24-2022 12:16 AM |
PO172 code after Cylinder Head replacement
I had a cracked cylinder head fixed and replaced the water pump, timing belt, fuel injectors (rebuilt). Also a few months ago I replaced the spark plugs and wires. I now have a PO172 code with System too rich bank 1. I cleaned the MAF and no help on the code. I understand one of the rebuilt injectors could be leaking fuel. How do you test for the bad one? Thanks Dave
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| gamefreakgc |
12-24-2022 01:05 AM |
The best way to test is using a multimeter to measure resistance at each injector. We have high impedance injectors so if one is significantly lower than the rest that's your leaky injector.
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| 19963.4lsr5 |
12-24-2022 07:51 PM |
Drive it a while and look at each spark plug. The one with the darkest signature is the cylinder running rich.
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| aa010175 |
12-25-2022 01:46 AM |
Is bank 1 on the driver’s side? Thanks Dave
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| 19963.4lsr5 |
12-25-2022 10:31 AM |
Quote:
Originally Posted by aa010175
(Post 3776304)
Is bank 1 on the driver’s side? Thanks Dave
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All 6 cylinders are Bank 1
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| Texmax |
12-25-2022 09:07 PM |
Quote:
Originally Posted by aa010175
(Post 3776193)
I had a cracked cylinder head fixed and replaced the water pump, timing belt, fuel injectors (rebuilt). Also a few months ago I replaced the spark plugs and wires. I now have a PO172 code with System too rich bank 1. I cleaned the MAF and no help on the code. I understand one of the rebuilt injectors could be leaking fuel. How do you test for the bad one? Thanks Dave
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Had a po 171, I found the throttle body gasket in upside down, did you pull that off?
Why did you replace the Injectors?
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| aa010175 |
12-25-2022 10:16 PM |
Quote:
Originally Posted by 19963.4lsr5
(Post 3776318)
All 6 cylinders are Bank 1
Sent from my iPhone using Tapatalk
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OMG you have to be kidding with me…. 😡
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| aa010175 |
12-25-2022 10:22 PM |
Quote:
Originally Posted by Texmax
(Post 3776361)
Had a po 171, I found the throttle body gasket in upside down, did you pull that off?
Why did you replace the Injectors?
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I did not remove the throttle body. I replaced the injectors because the had 250,000 miles on them and I had the engine stripped down. Dave
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| Zhehan |
12-26-2022 12:29 AM |
Quote:
Originally Posted by aa010175
(Post 3776366)
OMG you have to be kidding with me…. 😡
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The Bank 1 refers to the O2 Sensor. That's what's reporting the too lean problem. Single side exhaust system, so only 1 "Bank". Hope this helps clear up the confusion.
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| 19963.4lsr5 |
12-26-2022 07:31 AM |
Quote:
Originally Posted by aa010175
(Post 3776366)
OMG you have to be kidding with me…. [emoji35]
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It would be nice if Toyota had split the fuel management into two banks. But they did not.
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| Bad Luck |
12-28-2022 06:19 PM |
Quote:
Originally Posted by aa010175
(Post 3776193)
I had a cracked cylinder head fixed and replaced the water pump, timing belt, fuel injectors (rebuilt). Also a few months ago I replaced the spark plugs and wires. I now have a PO172 code with System too rich bank 1. I cleaned the MAF and no help on the code. I understand one of the rebuilt injectors could be leaking fuel. How do you test for the bad one? Thanks Dave
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Where did you get the injectors from? If you still have your old injectors I would put those back in and see what your fuel trims are.
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