99: ENGINE IDLES UNEVENLY AND VIBRATES.

1999 Nissan Altima

Tiny

fuulhouse

August, 8, 2012 AT 3:46 PM

My engine revolution is uneven, fluctuates between 900-1000rpm when starting from a cold temperature. When its temperature is higher, maybe after driving around for sometimes, it starts and stalls. Also, when on idle, it vibrates. OBD-2 scanner returned MAP sensor and Throttle position sensor problem. I ve replaced the throttle position sensor but it still does that. I did not replace the MAP because I dont its location and becos I read that most times, the MAP malfunctions because the throttle is bad.
I will appreciate any help on the MAP location and any other help to solve this. Thanks

FOUND 469 RELATED QUESTIONS

6 Answers

Tiny

saturntech9

August, 8, 2012 AT 3:49 PM

Please post the exact code numbers not code descriptions. That will make it a lot easier to help you.

Tiny

fuulhouse

August, 9, 2012 AT 1:48 PM

The codes from OBD-2 scanner are p0120 - Throttle position sensor, p0105 - MAP circuit malfunction, p0443 - Evaporative Emission control system purge control valve circuit. I ve taken the car to my mechanic who said the MAP sensor is ok. But it still does that. I need to add that the car surges forward when changing from Gear 1 to 2. Thanks

Tiny

saturntech9

August, 10, 2012 AT 11:10 PM

So does your scan tool read live data?

Tiny

fuulhouse

August, 15, 2012 AT 1:36 PM

I am not sure. But I ll check it. What should I look for?

Tiny

saturntech9

August, 15, 2012 AT 4:32 PM

See what the tps sensor reads while at idle?

Tiny

fuulhouse

August, 22, 2012 AT 12:27 PM

While at Idle, the tps read 0%, while I accelarated with the gear position in park, the tps still read 0%. Intake MAP showed 1kPA. Thanks

Please login or register to post a reply.

Spark Plug Replacement Ford Explorer 4.6L V8
Spark Plug and Wire Replacement Ford Mustang
Spark Plug Replacement Mercedes Benz C230
Spark Plug Replacement Toyota Corolla 2000-20
Spark Plug Replacement Toyota Tacoma
Spark Plug Replacement Mercedes Benz ML500
Spark Plug Replacement Honda Element