Question about 1991 Ford F150

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Runs to rich to pass sm.-check - 1991 Ford F150

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Try checking the fault codes, chances are you have a bad egr valve, bad oxygen sensor (O2 sen), or throttle position sensor(TPS), or idle air contol (IAC)

Posted on Apr 03, 2011

  • hstrawhacker Apr 04, 2011

    thank you ,would the cel come on if any of these things fail?

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The car won't pass smog check the computer says it's running to rich on the right and left bank


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Running Lean & driven rich-- would be my guess

Vacuum leak,O2 problem,many possibilities,failed converter,
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You do not go to inspection until you road test & look to see
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Have a 1989 f250 5.8 that didnt pass smog the guy told me its running rich the report said the HCdidnt pass just by a few numbers everthing else passed so i put plugs cap wires o2 sensor and a new brake...


Would double check your firing order on your cap.If running worse almost positive some wires were crossed.The spark plug firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) and runs counterclockwise on the distributor cap.

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What would cause the Car to run rich? I have


have you checked to see if the IACV is working properly. There is a screen on the inside that gets clogged and this keep the fuel system from getting the proper amount of air and run rough. Take it off and clean out both holes with carb. cleaner.

Feb 23, 2010 | 1992 Honda Accord

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Running rich


maybe all you need is a tuneup, i had this problem, it was tuneup time for me, change ALL FILTERS PLUGS CAP&ROTOR THIS WILL HELP

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98 jeep grand cherokee black smoke


Either your too rich and gas is getting by the piston rings going into the crankcase(oil pan)or you have a defective fuel pump (even if it is new!!)IT'S one or the other!!Running the car very rich for a period of time will have fuel in the oil!! I run mind rich for the nos and smell gas in the oil when draining it and only have a few passes on the motor with the nitrous,but runs extremely rich at idle because the timing is backed way down and running a colder plug causes a rich condition!! Plugs will foul quickly also!!

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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.

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