1990 Ford Mustang



January, 12, 2009 AT 8:05 PM

Smells problem
1990 Ford Mustang V8 Two Wheel Drive Manual 112000 miles

well I have a 90 5.0 and I just put tune up on it and it failed smog the passenger side bank is reading HC levels at 4309. And the driver side reads 1493 what could be my problem I have new wires, cap rotor, and plugs. But front plug passenger side looks wet not oil not water maybe gas please let me know


1 Answer



January, 12, 2009 AT 10:50 PM

Hydrocarbon failures mean unburned gasoline is passing through the engine and entering the exhaust. The three most common causes include ignition misfire, lean misfire and low compression (typically a burned exhaust valve). Ignition misfire can be caused by worn or fouled spark plugs, bad plug wires or a weak coil. Lean misfire results where there is too much air and not enough fuel, so check for vacuum leaks, dirty injectors or a fuel delivery problem. In addition to these, hydrocarbon failures can also be caused by oil burning due to worn valve guides, valve guide seals and/or rings

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