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What is proper idle rpm. Idles at 12000 Want to slow down to say 700. Replaced IAC valve ?

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  • Cars & Trucks Master
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You neglected to mention model , make and year but most cars idle around the 950 rpm mark or if earlier (pre1990 ) may be as low as 750 rpms
do not always rely on the dash tacho as they are not exactly accurate at the lower readings
use a mechanical rpm counter for ant settings

Posted on Apr 09, 2015

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Posted on Jan 02, 2017

cbaroni78
  • 44 Answers

SOURCE: high idle 1997 Madza 626 4 cylinder auto transamission

The PCM controls idle speed to ensure good driveability. The PCM will only attempt to maintain the desired idle speed when it “knows” the throttle is closed. A throttle switch or the TPS input is used to determine when the throttle is in the idle position. Motors and solenoids are used by most PCM’s to control idle speed. Many PCM’s are programmed to attempt to control the idle speed by adjusting spark timing and then by controlling the idle speed actuator. Some computers of the early 80's did not control idle speed.

Posted on Oct 19, 2008

  • 150 Answers

SOURCE: idle at 1500 to 2000 rpm

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

Posted on Feb 12, 2009

  • 1 Answer

SOURCE: 2001 v6 escape rough idle when cold

To update my earlier repair on the 2001 6 cyl Escape: When cold, and when the ignition was turned over but no accelerator pressure given, the rough idle finally returned the P0303 code again when the check engine light came on indicating that it wasn't caused by the plugs or the coil. FYI, I had replaced the intake manifold gaskets during the original repair and just prior to that I had replaced the fuel filter which was very dirty (I cut it open to see).

The repair manual referred to fuel injectors as a possible problem. I have run three tanks of fuel using different injector cleaning products and am very pleased with the results. Cold starts are much smoother and I am unable to coax out the P0303 code or any other code.

My opinion, change the fuel filter, use a fuel injector cleaner for a couple of tanks, change the plugs if the problem still exists. The coils were not the problem on my vehicle.

Posted on Mar 09, 2009

MNfisherman
  • 11896 Answers

SOURCE: 98 Accord, 120, 000 km. Engine idle drops and

Check for vacuum hose leaks or component clogs. You can use vacuum pressure tester.
or turn the idle screw down.

Posted on Nov 19, 2009

alicantecoli
  • 22095 Answers

SOURCE: 92 Ford F150 4.9L. starts good, idles rough, dies at slow speeds

4.9 litre ?? you having a laugh its a 10ton truck engine not a pick up -global warming machine,remove the pump/sender unit and check the gauze filter also look inside tank for a something floating around ,i think the idles is not a related problem to the vehicle losing power but their is a possibility you could have a problem with the little vac operated thing on the fuel injector line that allows the fuel through only when the engine is running

Posted on Mar 15, 2010

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Sounds pretty likely to be the iac. there should be a test for that - find it in the chiltons or haynes repair manual for your year, make model car - books found at yoru local auto parts store or local library - call ahead to be sure it is in stock
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I am working on a 2002 Cavalier. It runs fine without the AC on, but when the AC is on the rpm's go crazy. Normal idle for this car is about 700 rpm's, but when the AC is on the rpm's will randomly shoot...


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Automatic vehicle stalls at low rpm


This is proplem with the IAC valve , try clean the valve and if that doesnt work replace it.

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body

Thanks
Kindly rate the answer
Smith

Jul 09, 2009 | 2002 Land Rover Freelander

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96 f-150 idles really high


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Car running problem


Ok Slow deceleration rev responce was part of the ECU software to keep the emissions down ,however if this has only just started you can try to reset the IAC valve ,the procedure is as follows.

Turn ignition key on ,unplug the IAC valve ,turn the key off ,replug the IAC valve. do this 3-4 times .Then start the engine while holding the gas pedal to 2000 rpm ,then slowley let the go of the gas pedal till the engine idles .

The IAC valve is located on the throtle body and has 4 wires to it.

Sometimes the throtle body needs to be cleaned and then reset.

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