How can I pass smog?

Asked by Jul 13, 2016 at 05:32 PM about the Ford F-150

Question type: Maintenance & Repair

Install new injectors, O2 sensor, MAP sensor, PCM. Yet will not pass smog,
high HC from tail pipe. Prior to installing new parts , truck was taken to
diagnostic shop.

4 Answers

23,855

Catalytic converter... if it's bad changing out sensors does nothing.

1 out of 1 people think this is helpful.
11,745

Wow... a parts change attack! HC is hydrocarbons, It could be the EVAP system which state are you in? let's assume not Cali...Please let us know the name of the "Dianostic shop" Post It. I would check the catalytic converter first! What year f150 and which engine? most run multi HEGO sensors.. with the correct gear this is easy to isolate and correct the cause of the emission. Did they provide a print out of HC Co Nox Co2? How many PPM over is it in HC

1 out of 1 people think this is helpful.
65,075

Excessive hydrocarbons (HC) is usually an engine that's running too hot or too lean. HTH. -Jim

1 out of 1 people think this is helpful.

I live inc Cali. Name of Diagnostic Shop is AV Auto Clinic. I have a 1989 F150, 4.9 L, 5 speed manual trans. Truck has only one O2 sensor. Yes I have a printout. Max PPM is 96(15 mph, 1586 rpm), GP 305, Meas 489. CO% is Max 0.68 (same mph, rpm), GP 1.98, Meas 8.12. At 25 mph, 2443 rpm, Max PPM 69, GP 255 Meas 321. CO% (at same mph, rpm) Max 0.61, GP 2.17, Meas 7.58

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