Simple FOLLOW replace fuel injector Toyota Corolla √ Fix it Angel

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2003 Toyota Corolla, 4 cylinder engine 1ZZ-FE
It also applies to 2003 2004 2005 2006 2007 2008 Corolla's.
Chevrolet Prizm 1998 1999 2000 2001 2002

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Tested all 4 injectors and resistance were in specifications from previous video I made.
Watch here: https://www.youtube.com/watch?v=Z5xWObLKWTo

Car had a rough idle and in freeway speed there was no power. Check engine light on prior to testing. 3 DTC codes
Freeze Frame stored first code as follows.

P0171 Lean Condition: When the air-fuel ratio feedback is stable after engine warming up, the fuel trim is considerably in error on the rich side (2 trip detection logic)

Possible trouble areas:
-PCV hose
-Air induction system
-Injector blockage
-Mass air flow meter
-Engine control temperature sensor
-Fuel pressure
-Gas leakage on exhaust system
-Open or short in heated oxygen sensor circuit
-Heated oxygen sensor
-ECM

P0303 #3 Cylinder Misfire
P0304 #4 Cylinder Misfire

It was determined that #4 fuel injector was bad because of BLOCKAGE in the pin holes.

How I determined that, switched #1 injector to #3 injector and #2 injector to #4 injector, then drove the vehicle. Check engine light immediately came on. P0300 Multiple Misfire, P0301 #1 Cylinder Misfire, P0302 #2 Cylinder Misfire. The injectors on #1 and #2 now were misfiring.

In the video, I replaced the last injector. My friend would have saved on labor cost if he had replaced all the injectors all at one time. I recommend to replace all the injectors if one injector is clogged. It is more likely the other injectors will give off codes in the future.

Note: If it was a P0172 code with misfire codes, it is a rich condition, meaning there is unburned fuel, so then the coil packs could be the problem.

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