RPM GOING 3 X100 IN MORNING

1999 Honda City

Tiny

yasir.shaikh1

March, 5, 2012 AT 5:28 AM

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

FOUND 3989 RELATED QUESTIONS

6 Answers

Tiny

rasmataz

March, 5, 2012 AT 11:20 AM

Check the idle air control valve and clean the throttle body

Tiny

KHLow2008

March, 5, 2012 AT 1:41 PM

Is the MIL indicating?

Tiny

yasir.shaikh1

March, 6, 2012 AT 5:41 AM

No. Its not indicate. Just RPM going up for 30mins in a morning.

Tiny

KHLow2008

March, 6, 2012 AT 12:47 PM

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?

Tiny

yasir.shaikh1

March, 15, 2012 AT 5:34 AM

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.

Tiny

KHLow2008

March, 15, 2012 AT 2:12 PM

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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