Having problems with your Cars & Trucks ?

I have a 04 mustang 3.9 v6 and every time I start it, its rev a little high and makes a loud ticking noise but after a few seconds it idols down and the ticking goes away why is that?

Posted / edited by AnonymousUser on : 14-06-2021

Answers :

Fords do rev high when first started but a breather filter may be dirty,the ticking is probably the valves that haven't gotten oil pressure to them.If it has high miles you may want to use a full synthetic with your next oil change so the valves will be safer from start up wear.I personally use Slik 50 and Quaker State Synthetic Blend...
When a car is first started (ambient temp) the EEC "sees" the ECT signal as cold and the EEC will place the Stoich into COLD START MODE. When doing this, the AF mixutre is rich. Sort of like a choke does for a carbed car. This will create a higher idle speed. Usually cold start idle is around 2000 RPM at first.

If you are not mechanically inclined or good with cars, stop reading now..
But if you are good with cars, Try this:

To set your base idle you will need to have the car running, at operating temperature, all accessories off.

The next step is to disconnect the IAC (Idle Air Controller). The engine speed should slow to around 750 or it may stall. The proper setting is listed on the emissions decal on the cover of the coil.

With the IAC still disconnected set the idle speed using the adjustment screw on the front of the throttle body. Operate the throttle a few times to make sure that it is set properly.

Turn off the engine and reconnect the IAC and start the car. After a few minutes the idle should set itself around 950 to 1025 RPM. After doing this procedure, it may be necessary to reset the throttle position sensor
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