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1992 Sc300 Rough Idling With Vibration


shanky
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I have a 1992 sc300. It failed the emissions test and I replaced the EGR valve, Oxygen sensor and catalytic converter. After that the car passed the emissions test by i got a new problem.

When I take the car from rest and drive for like 5 minutes or so - till the engine gets hot and then when i stop at a traffic light I can feel the car vibrate and the idling is rough. If i take my foot off the brake the car really vibrates I mean it jerks while going forward.

Any idea what is going on and what i need to do to get it fixed?

Thanks,

-G

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  • 3 weeks later...
I have a 1992 sc300. It failed the emissions test and I replaced the EGR valve, Oxygen sensor and catalytic converter. After that the car passed the emissions test by i got a new problem.

When I take the car from rest and drive for like 5 minutes or so - till the engine gets hot and then when i stop at a traffic light I can feel the car vibrate and the idling is rough. If i take my foot off the brake the car really vibrates I mean it jerks while going forward.

Any idea what is going on and what i need to do to get it fixed?

Thanks,

-G

Run and OBDI on it to see if any of your sensors pop up. Chances are your TPS (throttle position sensor) is faulty. How's your gas mileage

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hey i think i know what it is...if its not your throttle sensor...try testing your Mass Airflow Sensor..when this goes bad it can cause the engine to run like crap..by crap i mean veryyy rough and choppy idling and driving..you could try to start your engine, then remove the Mass airflow sensor and see if the rough idling goes away..this will throw up some check engine codes but they will go away as soon as you put the sensor back in. let me know if this works

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Have you purchased any poor/cheap fuel lately? I;m leaning towards the MAFi(Mass Air Flow) or the Fuel Injectors being clogged. Usually when the TPS goes bad the check engine light comes on.

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