Inyection problem Explorer Sport 93'

[Johannf818]

Hello, i need help with my explorer sport 93, when i ride about 20 or 30 minutes, and i press the acelerator, it loses power and begins a gasoline odor along with a check engine light. I did a ECC scaning and it shows me this codes: 125-176-185 and 186. I appreciate your help, thanks

 

[Number4]

Welcome to the forum.

Look up the codes online and post what they mean. This will help others help you more quickly.

 

[Styx]

Check your fuel pressure regulator...

 

[natenkiki2004]

125 (M) TP voltage was lower than expected – Fuel control
176 (M) Oxygen sensor not switching – system is or was lean Left or Front HO2S – Fuel control
185 (M) Mass Air (MAF) output lower than expected – Fuel control
186 (M) Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected – Fuel control

I'd ignore the injector thing for now and focus on the MAF & TP being lower than expected as well as the lean condition. These could easily all be tied together and linked to a single sensor, you need to find out what the sensor is.

You can start with the easy stuff, look online to see how to test a throttle position sensor with a multimeter. If that checks out fine, rule it out. Clean the MAF with MAF cleaner or electronics cleaner.

It's also possible you have a significant vacuum leak which would cause a lean condition and the computer would see that and also note that the TP and MAF aren't registering the extra air. If you have a fuel smell at the same time, I'd be wondering about the evap system vacuum lines. Follow the lines off of the charcoal canister by the radiator and make sure there's no breaks.

Also, don't put an O2 sensor in just to change parts. The fact that you get a code for the O2 sensor means that it's working, not that it's faulty.

 

[Johannf818]

Inyection problem explorer sport 93

Codes
125: TP voltage was lower than expected – Fuel control
176: Oxygen sensor not switching – system is or was lean Left or Front HO2S – Fuel control
185: Mass Air (MAF) output lower than expected – Fuel control
186: Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected – Fuel control

The MAF sensor is new and the fuel pressure is good.
When i have the problem i turn off the truck, then when i start the engine again, the problem disapear for a while. Thanks for your help

 

[malohnes]

Check all your connections and check O2 sensors. When in closed loop running, fully warmed up and running, you should be running off of the O2 sensor readings, this can cause all sorts of drivability issues you are experiencing.

 

[natenkiki2004]

Sounds like you need to look at the throttle posistion sensor. Easy to test with a multimeter. http://easyautodiagnostics.com/ford/4.0L/how-to-test-the-tps-1

 

[Johannf818]

Hello, i checked the TPS sensor with the manual and with the reference link that you gave to me, and the voltage is positive (+) (4.8 dc) in the reference cable and they get out of the sensor through the signal cable with negative voltage (-) for example, from -0,9 V until -4.7 V moving the acelerator. Is this normal?

 

[natenkiki2004]

Not normal to have negative voltage but maybe you just had the test leads wrong or something. The point of the test is to ensure you have 5v reference coming in and approx 0.5v-4.5v output depending on throttle position. The output should scale smoothly as you slowly open/close the throttle. If it does then it's fine.