Question about 1989 Ford Bronco

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My truck is running rich and wont pass smog. i have made sure timing is good and no vacuum leaks and replaced the o2 sensor. what else can I check?

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Install a new catalytic converter and check your air filter

Posted on Jun 28, 2009

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My 87 nissan pick up wont pass,its idling to fast,burning rich


Well I don't live in a state nor have I ever lived in a state that makes you do that ..but I would check for exhaust leaks ..and change or check o2 sensor ..but also search internet for sites or blogs with people with same make and model and can help you .good luck

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... running rich I have a 1991 Camry that is running rich. I just replaced the O2 sensor and a new cat, oil change, new spark plugs. The car wont pass smog. it is ...

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91 camaro vacuum leak?


CHECK SPARK PLUGS AND TIMING ~~( ALSO TUNE UP DISTRIBUTOR CAP, EGR, O2 SENSOR) , VACUUM WILL CAUSE LOOPS BUT WONT CUT CAR OFF

Apr 20, 2013 | 1991 Chevrolet Camaro

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Replaced 02 sensor in 2000 ford focus but still get the same codes


Why not try a used ECM? and get the key from the same vehicle if it is chipped.If yours and it are chipped,cut a non chipped key for your ignition.and once the used (known good working unit) ecm is installed ,use the nonchipped key in your ignition while holding the ecm key next to your ignition switch to start the vehicle.Once started run it and see if the same codes come up.If all is OK tape the chipped key under the plastic at the ignition lock and use non chipped keys now and pass the smog.

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1 Answer

Won't pass smog, Rich idle.


First, is the check engine light on ?
You should have a code for the O2 sensor showing the exhaust gas is rich.
Could be a faulty injector, fuel pressure regulator, or O2 sensor.
Even a faulty thermostat would do it.

Sep 15, 2012 | 1991 Oldsmobile Cutlass Cruiser

1 Answer

My 95 Passport is running rich...


Try resetting computer and unplugging O2 sensor, and see what happens, if fine replace sensor. Ther are only so many things that can cause a rich condition, excess fuel pressure, EGR valve leaking exhaust into intake when it should be closed, no vacuum to fuel pressure regulator or ruptured fuel pressure regulator diaphram, no vaccum to MAP sensor, Air or Coolant temp senosr reading cold when engine is hot. Your mechainc shold be able to eliminate all these.

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1 Answer

1991 Camry running rich


check for vacuum leaks especially around the intake manifold gasket. Although the engine appears to be running rich, it could also be misfiring due to being too lean in one cylinder. When the cylinder doesn't fire the charge, it goes into the exhaust completely unburned and looks like a rich running condition due to the unburned fuel. If it is a vacuum leak causing the problem, the engine will run fine at road speeds but misfire at idle and not pass smog.

Jan 30, 2009 | 1991 Toyota Camry

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