Question about 1999 Ford Explorer

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I have run out of deductive reasoning on my 99 ford explorer with the 4.0 sohc engine. Based on extensive research, I have replaced the plugs, wires and coil. I have tested and cleaned the MAF sensor. Disconnecting did nothing but make it run worse. I have checked the EGR, and it seems to be functioing fine. I had the code run today, but there is no decifering the combination and what they collectively mean together. I am certain that some appear due to other sensors reacting to the root cause. I am out of ideas...help! The codes are, P0102, P0113, P0171, and P0302. I was going to replace fuel filter for grins, but the stupid tool doesnt work... any ideas? Anyone?

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Hi,

The following are the codes you have given me:

PO102 - MAF sensor - Low voltage input getting to the MAF sensor which is the signal it is receiving from the CCM.
Check:
1. MAF not disconnected
2. MAF has voltage to it from CCM
3. Intake air leak close to MAF
4. A faulty Throttle Position Sensor
5. Damaged MAF sensor
6. Faulty PCM

PO113 - Intake Air Tempreture Circut - High Voltage input

Check:
1. Open circut in harness
2. Sensor signal is shorting
3. Damaged Sensor
4. Improper harness connection
5. Paulty PCM

PO171 - System is to lean in bank 1

This will be caused from the 2 previous faults.

PO302 - Misfire Detection Monitor

Check:
1.Ignition system
2. Fuel injectors
3. Low fuel
4. EVAP canister purge valve
5. Fuel pressure

Check the easier faults first then start looking at the more difficult if the main systems check out, hope this helps let me know if you need more information.

Thanks

Jason

Posted on Jul 15, 2010

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