1997 Nissan Altima 1997 Nissan Altima Throttle Problem

Tiny
NSTEWART
  • MEMBER
  • 1997 NISSAN ALTIMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
I have a 1997 Nissan Altima (manuel). It shows a code of PO120 which is for the throttle position sensor. I replaced the throttle position sensor, but it still has the same code. I don't think that the part was defective because before replacement of the throttle sensor, the vehicle misfired when driving. It's not misfiring anymore, but it is idling too high. When it's in neutral, it idles at 500 rpm. When I place it in gear, it idles at 1000 - 2000 rpm. The gas pedal is also hard to press. It recently had a tune up and I've had the manifold intake checked for leaks and none were found.

I'd appreciate any help on this matter.
Sunday, June 22nd, 2008 AT 6:19 PM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi nstewart,

After installing the new TPS, did you reset the ECM?

Did you calibrate the TPS settings?
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Monday, June 23rd, 2008 AT 12:00 PM
Tiny
NSTEWART
  • MEMBER
  • 2 POSTS
I had a mechanic look at it yesterday and like you said, he told me that the TPS needed to be calibrated. He made some adjustments, and the car is running fine now.

Thank you for your reply.
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Tuesday, June 24th, 2008 AT 6:52 AM

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