1999 Volvo C70 Engine revving while in Park 'idling' or in

1999 VOLVO C70
Avatar
WHOSYODADDYOOORAH
  • MEMBER
  • 1 POST
Engine Mechanical problem
1999 Volvo C70 Front Wheel Drive Automatic 124000 miles

My engine is a 5-Cylinder Turbo charged. When operating my car in 'Park' or "nuetral' my engine revves (from an idle RPM to a higher RPM) in an oscillating fashion. This does not happen when the car is in 'Drive' or 'Reverse'. Any idea what's causing this?
Mar 9, 2010 at 8:50 AM
Advertisement
Avatar
KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Hi Whosyodaddyooorah,

Thank you for the donation.

The idling speed is higher than expected causing the surging.

• Check coolant temperature sensor and connection.
• Check air temperature sensor and mass airflow meter.
• Check coolant temperature sensor.
• Ensure spark plugs are not fouled.
• Check ignition and sensor wires for proper connection.
• Check ignition and coil circuit.
• Check intake system.
• Check coolant level.
Mar 9, 2010 at 12:12 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.