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2002 Holden Commodore RPM drop when cruising

Tiny
KWAKA300
  • MEMBER
  • 2002 HOLDEN COMMODORE
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 180,000 MILES
My 2002 vx commodore executive, whilst cruising regardless of speed and rpm drops suddenly and stays low (generally around the 1500rpm mark) or if I back off the throttle to slow down gradually or going down a hill the rpm drops suddenly to idle. There is no problem when the car is underload and acceleration, the car does not run rough or splutter, it idles fine, though on 3 occasions the engine has just cut out for no apparent reason. Originally thought it may of been from bad fuel since it started happening soon after filling up, so drained the tank and used a higher quality. Fuel but the problem is still there. Any help would be great thanks.
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Wednesday, March 26th, 2014 AT 12:53 AM

3 Replies

Tiny
KNOWLEDGE IS POWER
  • MECHANIC
  • 1,136 POSTS
That sounds like there's a problem with the throttle position sensor. Do you have an engine light?
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Wednesday, March 26th, 2014 AT 7:33 AM
Tiny
KWAKA300
  • MEMBER
  • 2 POSTS
No warning lights or anything. And its not a consistent problem, happens at random times.
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Wednesday, March 26th, 2014 AT 3:44 PM
Tiny
KNOWLEDGE IS POWER
  • MECHANIC
  • 1,136 POSTS
I'm willing to bet there's wiring damage or perhaps corrosion in a circuit somewhere. Do you know where your engine control module is or the throttle position sensor? I'd suggest unplugging them and inspecting as much of the wiring as possible. I don't have info on your exact car here in the states but I'll help you any way I can
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Thursday, March 27th, 2014 AT 4:15 AM

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