2000 Toyota 4 runner 6 cyl

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2000 TOYOTA 4RUNNER
6 CYL
4WD
AUTOMATIC
189,000 MILES

Toyota 4 runner is not running backfiring thru the breather when giving gas & missing, will idle fine but not while giving gas, we changed oxygen sensor and the plugs and plug wires just all of a sudden started missing and has gotten worse

Sunday, January 9th, 2011 AT 8:21 PM

5 Replies

ROMYSPEC

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38 POSTS

Has these syntoms began after chaging the plugs and plug wires?

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Sunday, January 9th, 2011 AT 8:47 PM

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Not really but it got worse after plugs replaced plugs 2 times and wires 2 times replaced fuel filter and the oxygen sensor 2 times plugs are right and the wires are right got the digram from oriellys auto parts

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Sunday, January 9th, 2011 AT 11:25 PM

RASMATAZ

MECHANIC
75,992 POSTS

Engine running rough or misfiring can be cause by the following:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-

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Monday, January 10th, 2011 AT 2:59 AM

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