Idle adjustment screw? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-08-2014
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Idle adjustment screw?

1999 Ranger 3.0 Manual trans

is there an idle adjustment screw on these engines? If so, where is it located and how do i use it?
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Old 12-08-2014
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From what I remember, idle is set by the computer, no manual adjustment.
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Old 12-08-2014
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thanks
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Old 12-08-2014
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No, fuel injection has no "jets" to suck fuel out of so idle screw wouldn't work.

There is the throttle plate screw on some fuel injected engines, it serves two purposes, neither of which is for idle speed.
It is to adjust minimum air flow past throttle plate and TPS(throttle position sensor) voltage

Fuel injection engines use an IAC(idle air control) Valve, it is located on the upper intake near the throttle plate.
It sits on an air passage that by-passes the throttle plate, computer operates this valve to set target idle speeds.
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Old 07-25-2016
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RonD...
I have a 1997 Ranger XLT with a 2.3L and a manual transmission...
I'm fairly comfortable with cars and am a moderator on kia-forums...
I have been putting this truck back together after winning it at a salvage auction...
It has been inspected and is now street legal...
I have added OEM Air Conditioning, power windows, power locks, power mirrors and just replaced the wonderful FORD designed slave clutch with throw out bearing attached... (I wouldn't wish this repair on ANYONE) ....

The problem I have now is that when the AC is on and the truck is slowed to a stop the engine stalls...the system is not over charged and consists of stock AC parts.... Before when I installed the AC the WOT relay would cycle on and off and not allow the compressor to run... I disabled that relay and the AC then behaved itself....

Is the ECU/ECM programmed differently for a truck that has AC than one that doesn't? I know there is no "idle adjustment" and it's (the idle) usually controlled by the ECM to compensate for the extra drag in other vehicles....

Without the "air" the engine will idle just fine, it has plenty of HP... and there are no codes stored...
Have you got any idea of why I'm having these problems??

Thanks Dave
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Old 07-25-2016
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Yes, factory AC vehicles have a wire from AC switch to computer, computer will kick up idle 50-100rpm when AC is on.

On the EEC-V computer pin 41 will get 12volts when AC switch is on, that should kick up the idle.

12v----AC switch--------cycle switch-------high pressure switch----------WOT Relay----compressor

Pin 41 gets power from a splice at WOT relay, pressure switch side.

Not sure the computer will have the software for, I would think so.
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Old 07-27-2016
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Thank you Ron....
Dave
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Old 07-27-2016
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Not sure if you can kick up the idle manually on a fuel injected engine.
The IAC(idle air control) Valve is the issue.

If you setup a solenoid to kick up the idle with AC on then the computer would use the IAC to close more to lower it back down to target idle.
You could use the anti-diesel screw to open up the throttle plate more to increase warm idle higher at all times, so IAC valve is closed all the way and computer can't lower it any more, that could set a code for TPS or IAC Valve, not sure?
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