Question about 1988 Ford F 150

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Replaced all ingnition parts, rotor cap plus wires and muffler, used guaranteed to pass stuff. I have failed my emmissions test three times. hydrocarbons at idle, changed all parts above and got down to 2200, changed muffler and got got cat really, really hot on freeway and got the levels down to 1500. what am i missing? 1988 ford f-150 straight six? Glenn

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  • yadayada
    yadayada Aug 03, 2010

    the parts you changed will not really affect HC levels unless u have a misfire, does the engine idle rough, any intake leaks detected, how many miles? is the catalytic converter new? did u change the oil before the test? My experience? Ford certified Master tech, 30 years as a class A smog inspection technician (test and repair unlimited lic).

  • thomasonglen Aug 04, 2010

    two catalytic converters, one front 22 years old, rear replaced in 02..... 317k miles

  • yadayada
    yadayada Aug 04, 2010

    have u cleaned the throttle valve and the idle speed control valve valve,if they get sludged up it causes the HC's to really raise at idle,also one more time did you change the oil before you tested,please answer all my questions or I can't help,never ever was not able to get this year to pass after it failed, also did you use a factory catalytic converter? the after market ones are crapola...

  • thomasonglen Aug 04, 2010

    replaced trottle valve on top of pletum, no i did not change oil before test and cat from meinike in 2002 after market yes. I also changed timing gear in 2008 and put it back on one tooth off. a mechanic lifted dist. and moved it one tooth also, i think this is a bad cat and the timing is off?

  • thomasonglen Aug 05, 2010

    Dear sir,
    I replaced my timimg gear and it was put on one tooth clockwise forward of timing mark. the mech moved the dist one tooth also. what would my timing be set at now, it starts and runs fine? Glenn

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High hydrocarbon emissions from a vehicle may be caused by improper ignition timing, faulty ignition, misfiring problems, vacuum leaks, worn piston rings or valves or an exhaust gas recirculation system incorrectly operating at idle. One fouled spark plug can result in extremely high hydrocarbon emissions. check the vacuum lines Clean you EGR Valve of any carbon deposits, and make sure it is functioning correctly. Pour a can of a good Fuel Injector cleaner such as Seafoam or Techron in a full tank of fuel. Leave the cheap stuff on the shelf, as is does very little good. To remove built up carbon deposits, inject it through the intake by following the directions on a can of Seafoam. Have someone check the timing on this vehicle. Check the smog pump to see if it is functioning. A compression check will verify if you have worn rings or a burnt valve.

Posted on Aug 03, 2010

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  • Master
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Have you tried replacing the oxygen sensors. These signal to lean the gas or rich the gas for emissions.

Posted on Aug 03, 2010

  • thomasonglen Aug 04, 2010

    yes, oxygen sensor before first cat converter..

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