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Problem with unstable RPM while moving

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check the valve clearances.
What are the trouble codes you are getting?
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
YASIR.SHAIKH1
  • MEMBER
  • 3 POSTS
  • 1999 HONDA CITY
  • 240,000 MILES
My car have RPM problem when I start in a morning, its RPM going up till 4 x100 and after half an hour its going down automatically.

I have check many mechanic but problem are still not solve.

Your swift response will be highly appreciated.

Regards
YS
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the idle air control valve and clean the throttle body
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the MIL indicating?
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
YASIR.SHAIKH1
  • MEMBER
  • 3 POSTS
No. Its not indicate. Just RPM going up for 30mins in a morning.
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Follow Rasmataz's recommendation, check the IAC for sticking.

Ensure you have sufficient coolant in system and coolant hoses to IAC are not clogged.

Check for vacuum leakages.

After engine warms up to operating conditions, what is the idling speed?
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
YASIR.SHAIKH1
  • MEMBER
  • 3 POSTS
IAC is jammed, if I trying to open hardly so it will break and here in Karachi, Pakistan new IAC are not available in open market.

After engine warm-up the car running normally with idling only when I start in morning or after 2 or 3 hour time its idling and RPM goes 4x1000 for half an hour or more.
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If you have removed the IAC from the housing, don't disassemble it.
Spray some rust penetrant into the [ports and let it soak for a while. Use a feeler and gently pry at the vale to make it open. DO NOT force as it will damage the valve. Try to slowly work the valve loose. It might take some time.

Use carb cleaner to clean what ever dirt inside the chamber and after job is done, make sure the valve moves easily with minimal force and befor installation back to throttle body, spray some rust penetrant into the chamber again to lubricate the bearings. Let it soak for a while as the 2 bearings would seize if it is not lubricated.
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
HONDA LOVER
  • MEMBER
  • 2 POSTS
  • 2010 HONDA CITY
  • MANUAL
  • 1,000 MILES
Hi, I was wondering if you could give me some advice on my new Honda City. When I am just sitting at the lights (in 1st gear or neutral), just idlying, my car seems to be "jittery". Basically you can feel it shaking intermittently, like its gonna stall or as if its revs are too low. I took it back to my Honda dealer's service centre twice, and both times they checked the computer and said that there is no problem? I find it soooo frustrating, it feels like im driving an old car :-( Do you have any ideas what this may be and if its normal? Thanks.
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Monday, February 11th, 2019 AT 4:27 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
No vehicle new or old should have such problems.

Note if occurrence is when A/C compressor cuts in or out.
This could be an idling or electrical problem and the computer is not going to show anything.
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Monday, February 11th, 2019 AT 4:27 PM (Merged)

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