ROUGH IDLE

1996 SAAB 900

Tiny

Porteous

September, 26, 2011 AT 2:16 PM

Have new di cassette, no vacuum leaks, new platinum plugs and fuel fitler. Idle varies, sometimes very rough and sometimes not as rough. Code 1170 shows misfire. Could this be caused by a fuel injector or engine computer. Also periodically there is a loud humming noise on drivers side. Has new clutch. I getting tired of trying to fix this car.

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1 Answer

Tiny

hmac300

September, 26, 2011 AT 2:54 PM

It cold be a bad wire, plug or injector as well as low fuel pressure will cause a misfire. A vacuum leak will as well. Fuel pressure should be 43.5 psi

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