4.0 running really rough

99B4000_4x4 · May 27, 2009

My truck started running really rough today and now is barely running at all. Went up to autozone and the codes said that both the O2 sensors were bad and were running lean. That code has been saying that for almost a year and the truck ran fine until now. Should I go ahead and replace the sensors or is their something else I need to check? Thanks

JunkYardRanger · May 29, 2009

check fuel pressure if ur running lean u do not have enough fuel to the motor

Randy960 · May 31, 2009

injectors, sounds similar to the problem I was having

AllanD · May 31, 2009

REPLACE FUEL FILTER

Test fuel pressure

Run injector cleaner.

bad injectors are about as common as honest politicians.

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bjp · Jun 1, 2009

Mass Airflow Sensor could also be a problem. If its dirty then the cpu gets the wrong airflow and ends up sending in the wrong fuel amount.

4.0 running really rough

99B4000_4x4

10+ Year Member

JunkYardRanger

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Randy960

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AllanD

TRS Technical Staff

bjp

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