hyundai 2.7 V6 misfiring???2002 year?

Question

started misfiring real bad after bank2 sensor 1 was replaced,took it to a hyundai tech .they tested the massive air flow sensor.it was good.they unhooked exhaust system to see if that would give back power it has lost and that did not help,so they think it may be clogged up catalytic converters mounted on manifold;but they are not sure that is the problem!Took it to another mechanic  he pulled the front three spark plugs one at a time .they were working good but motor idle did not change when they were hooked or unhooked.He said that I had engine misfire and said the fuel injectors were either clogged up or worn out.said it was a fuel control problem.What is your opinion?  He said if we changed fuel injectors that were bad and cleaned the others it should take care of the misfires and bring my power back to where it should be.

MasTec 1970 · Accepted Answer

1. The proper method for testing the manifold cats is to remove the upstream O2 sensor and screw the pressure gauge into the O2 hole starting the engine and check the backpressure! How could he tell if it is an injector without checking the general mechanical condition of the engine! And the way to test the injectors is to add supplemental fuel and determine if it still sets the misfire codes! I think you need to find another technician sounds like this one is a parts thrower (at your expense)

hyundai 2.7 V6 misfiring???2002 year?

1 Answer