1998 Nissan Altima 98 nissan altima shakes

1998 NISSAN ALTIMA
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FLORENCIAVZ
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  • 1 POST
1998 Nissan Altima 4 cyl Automatic 145000 miles

my 98 altima shakes whenever i turn on the AC..it also shakes when im at a stop light and the car is in drive..any idea of what this might be???? PLEASE HELP!!! ive gone to 5 diff. mechanics and each say something diff.
May 12, 2010 at 4:15 PM
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BLUELIGHTNIN6
  • ✓Experienced Mechanic
  • 16,542 POSTS
Your car may be equipped with an Air Conditioning Idle Valve which increases idle speed when the air conditioning compressor engages to compensate for the greater power required to run it. If the A/C Idle Valve is not functioning properly and switching on, then the A/C compressor needs more rpms than your motor is producing at standard idle, and pulling power from the engine itself.
Other possible causes are poor fuel pressure. Replace fuel filter first. Doesn't solve problem check fuel pressure. Your fuel pump may be bad. Spark may be weak, check for healthy blue spark at plugs.
May 12, 2010 at 4:38 PM
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