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Pulled codes172 and 224


Shanee

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I pulled the codes 172 and 224 i replaced the coil packs already so i dont know why 224 is coming up unless its a different problem and 172 sensor fault /lean it says HEGO (H02S) rough idling and low rpms need help fast
 


RonD

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What engine?
224 code is often 2.3l engine issue

172 means computer has reach a preset limit of adding more fuel to the mix but O2 sensor is still reporting lean exhaust(too much oxygen).
This can be from a vacuum leak, but would expect high idle with that.
An exhaust manifold leak pulls in air which will throw off O2 readings
It could be the O2 sensor itself but if it is the exhaust should be blowing a bit of smoke because of rich mix.

If engine is warmed up and idling, unplug the IAC Valve, engine idle should drop even lower, around 500rpm or even stall, that would mean computer was setting the low idle for some reason.
Target idle for warm engine is 700 for manual trans, 800 for automatic
 

Shanee

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2.3 liter
Transmission
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RonD said:
What engine?
224 code is often 2.3l engine issue

172 means computer has reach a preset limit of adding more fuel to the mix but O2 sensor is still reporting lean exhaust(too much oxygen).
This can be from a vacuum leak, but would expect high idle with that.
An exhaust manifold leak pulls in air which will throw off O2 readings
It could be the O2 sensor itself but if it is the exhaust should be blowing a bit of smoke because of rich mix.

If engine is warmed up and idling, unplug the IAC Valve, engine idle should drop even lower, around 500rpm or even stall, that would mean computer was setting the low idle for some reason.
Target idle for warm engine is 700 for manual trans, 800 for automatic
Click to expand...

Its a ground problem and an o2 sensor thanks though and it is 2.3 5 speed manual
 
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