Question about 1993 Ford Ranger SuperCab
93 ford ranger 4.0 at 2wd starts good idles good step on the gas from idle and it bogs and pops lift up on the gas and it idles ok step on the gas slowly and it will go right up to 3000rpms fine. just seems to bother when you step on the gas quickly. we changed the coil-wires-02sensor-tps sensor had it on a snap on scan tool and it said rich 02sensor replaced both. any help would be help ful. thanks Bud
The idle speed is controlled by the PCM based upon sensor inputs using
the Idle Air Control (IAC) valve to regulate air input past the closed
throttle plate to the intake.
The PCM controls the IAC using a solenoid to move the valve body that opens and closes the air passage to the intake. The PCM ensures a seamless transition from IAC control to throttle plate control of engine speed using the Throttle Position Sensor (TPS) attached to the throttle plate.
If you pull the electrical connection from the IAC (round body fitting bolted to throttle body) usually the engine will stall. If it doesn't then you may have a vacuum leak. Check hoses and connections are secure. Your symptoms are consistent with a small vacuum leak.
Try holding the idle a bit longer, then the PCM will set a code. So that is what you need to do, try to hold the throttle just off idle to retain the hesitation long enough for the PCM to try a few strategies and settle on the problem and set the code. You can then get the code read at Autozone, Pep Boys or Checker. You need the P0123 number not the description.
Hope that helps!
Posted on May 19, 2008
Check the air filter too that should be clean too for a proper engine breath
Posted on May 19, 2008
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Posted on Jan 02, 2017
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