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2002 Rover 25 high revs

Tiny
SHEFFWEDFAN
  • MEMBER
  • 2002 ROVER 25
  • 4 CYL
  • FWD
  • MANUAL
  • 585,000 MILES
My rover 25 starts ups and idles at 1100 rpm as it should but as the engine gets warm my rev counter rises and starts to idle at 1500 rpm but engine is not racing does this mean that my idle air control valve is faulty thanks
Wednesday, August 19th, 2009 AT 11:33 AM

13 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Maybe or engine coolant temp sensor
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Wednesday, August 19th, 2009 AT 11:58 AM
Tiny
SHEFFWEDFAN
  • MEMBER
  • 7 POSTS
Ive replaced the cts
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Wednesday, August 19th, 2009 AT 12:36 PM
Tiny
DOCFIXIT
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Try cleaning IAC and passageways. Check for vacuum leaks also clean throttle body maybe carbon on plate
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Wednesday, August 19th, 2009 AT 1:37 PM
Tiny
SHEFFWEDFAN
  • MEMBER
  • 7 POSTS
Ive try cleaning the iacv but a sealed unit, cleaned the tb and ive tried spraying wd40 on engine for leaks I think I can hear a leak but not sure if this is normal
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Thursday, August 20th, 2009 AT 9:11 AM
Tiny
DOCFIXIT
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For vacuum leak use carb cleaner when it hits leak idlewill change.
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Thursday, August 20th, 2009 AT 9:24 AM
Tiny
SHEFFWEDFAN
  • MEMBER
  • 7 POSTS
Where do I spray the carb cleaner to find leak, if there is no air leak is the iacv at fault
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Thursday, August 20th, 2009 AT 11:17 AM
Tiny
DOCFIXIT
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Try unpluging IAC and repluging can you hear motor run? I don't have acess to Rover info but there should be test proceedures like Ohm checks.
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Thursday, August 20th, 2009 AT 11:30 AM
Tiny
SHEFFWEDFAN
  • MEMBER
  • 7 POSTS
When I turn the engine off I can hear the motor on the iacv working but how far should the plunger move, when I tried cleaning and switched the igniton on I saw the plunger move
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Thursday, August 20th, 2009 AT 11:43 AM
Tiny
DOCFIXIT
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Could try an experiment remove IAC and plug off airway. Start see if it still idles at 1500
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Thursday, August 20th, 2009 AT 12:02 PM
Tiny
SHEFFWEDFAN
  • MEMBER
  • 7 POSTS
Ive tried removing the iacv and plugging up the airway but the car will not start unless someone is manually opening the butterfly vakve on throttle body I have changed the cts but is it possible that they supplied me with the wrong one
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Friday, August 21st, 2009 AT 9:06 AM
Tiny
DOCFIXIT
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That tells me that air is not getting around throttle plate so IAC looks suspect.
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Friday, August 21st, 2009 AT 9:17 AM
Tiny
SHEFFWEDFAN
  • MEMBER
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Ive replaced the iacv with a secondhand one and still the same problem but I cant hear any air leaks now is it possible the lambda sensor is faulty
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Monday, August 24th, 2009 AT 12:02 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
https://www.2carpros.com/forum/2002-rover-25-high-revs-vt337616.html
Check out this post almost same problem. Maybe you two should exchange notes
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Monday, August 24th, 2009 AT 12:10 PM

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