Ken (or anyone), i pulled the codes today and got several. KOEO self-test:
31 1 32 41 63
the book said to clear these codes up and get 11 code for KOEO before proceeding but wait on the Continuous Mem codes for later

31 is for: the EVP or PFE sensors under minimum voltage specs. or EVP solenoid circuit problems or EGR is not in normal closed position.
i need tips to clear up this code. any suggestions?

Thanx in advance!!!

 

Don't know what year your Ranger is, but if you have a hand held vacuum pump, hook it to the vacuum line port of the EGR valve. Just a slight amount of appilied vacuum should open the valve causing the engine to "stumble". Releasing the vacuum should let the valve return to the closed position and return the engine idle back to normal. Don't let the EGR valve stay open too long, you may get another code, P401 Ithink, "Excess EGR flow" or something like that. Check the EGR tubing also. They have been known to crack between the valve and the intake manifold. (JB Weld fix). If this works, the EGR valve is probably OK.

I'v read other posts for the faulty EVP codes. According to what I've read, Ford sells a repair kit for around $20 that includes the solenoid and sensor.

Hope this helps,

H2Os50

 

401 is insuffeciant EGR flow,caused by a bad DFPE or a plugged port under EGR valve.

 

sorry, it's a 91 EFI 4 banger.

 

This might help, my '93 Manual says:

The EGR Valve Position (EVP) sensor monitors the position of the EGR valve pintle. The EVP sensor converts the mechanical movement of the pintle into an electrical voltage signal which is relayed to the PCM. The EVP sensor is a linear potentiometer in which resistance varies with the EGR valve pintle movement. The EVP sensor provides the PCM with information on EGR flow and EGR system failures...

DTC 31/327 indicates that the EGR Valve Position (EVP) sensor signal is less than the Self-Test minimum value of 0.2 volt.

Possible causes:

-- Damaged EVP sensor.

-- Damaged EGR valve.

-- Open harness.

-- Grounded harness.

-- Damaged Powertrain Control Module (PCM).

NOTE:
Because the EVP sensor is preloaded when attached to the EGR valve, a failure in the EGR valve causing the EVP sensor to lose preload may also set DTC 31/327.

So you probably ought to start by taking off the EVP sensor and checking the harness connector running to it, see if there is any breakdown in the wires or leads. If you find nothing, clean everything real good and put it back together, clear the stored codes, and see if the code 31 comes back. If it does, then next on the list to consider is a bad EVP sensor or bad EGR valve. The kit that H2Os50 mentioned sounds like it might be just the fix in that case.

 

what would you use to clean the sensor?

 

can i go ahead and pull the KOER codes or should i wait to fix the KOEO 31 code?

 

How do you clean the metal shaft on the EVP sensor and the rest of it for that matter. Just wipe it off or what?

Also,
can i go ahead and pull the KOER codes or should i wait to fix the KOEO code 31?

 

nevermind, i just wiped it off and code 31 went away, must not have been closing all the way. so i ran the KOER test and got codes 33 and 52. 33 points to the EGR and 52 points to the power steering circuit open, correct? so what about the KOEO codes 32 41 and 63? PLEASE, i need ideas.

By the way, I skipped the engine timing check test since my engine is a DIS, was I suppose to skip it?

 

You should address the codes in this order, KOER, KOEO then continuous.

 

how do i address the open circuit on the power steering pump (code 52)?

 

If you have a PSPS you are required to turn the wheel after the ID in the KOER test, this may have cause the code if you missed it.

 

To elaborate on what Ken said:

FF5 DIAGNOSTIC TROUBLE CODE (DTC) 52/521

NOTE:
Some vehicles are equipped with a PSP switch software strategy, but do not have hardware released for the engine/vehicle application. When DTC 52/521 is received in Key On Engine Running, check to see if the vehicle is equipped with PSP switch. If not, disregard servicing DTC 52/521.

Engine Running Service DTC 52/521 indicates that the PSP switch did not change states due to the switch staying either open or closed.

Possible causes:

-- Damaged PSP switch.

-- Open or grounded harness circuit.

-- Damaged Powertrain Control Module (PCM).

-- Wheel turned, not centered.


When you were checking codes, did you turn the steering wheel at least one-half turn within one or two seconds after the engine ID code? The sequence of steps necessary to properly pull KOER codes is important.

After checking to make sure your Ranger has a PSP switch, it again comes down to checking the integrety of the wires and circuit, and then after that you have to look at the PSP switch itself.

 

for code 33 it says it is insufficient EGR flow. my EGR looked pretty dirty inside. How do i clean it? also would insufficient EGR flow cause my engine to "stumble" when accelerating?

Thanx