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99 ford explorer: no leaks found, the egr valve..exhaust..blow…

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I HAVE A 99 FORD...
I HAVE A 99 FORD EXPLOROR, 4.0 MOTOR, 65,000 MILES, HAS ENGINE CODES #s po 174 system too lean (bank 2), po 171 system lean ( bank 1), po 102mass or volume circuit low input, po 113 intake air temperture circuit high input. i have removed and replaced mass air control sensor , did'nt help, sprayed all around the intake for leaks and no leaks found, the egr valve intake exhaust side (input from exhaust) of egr is cool too touch, disconned exhaust input side and had blow from exhaust, so line was'nt plugged. discounted vacume valve from egr with no increase in rpm, runs rough until warmed up , but very poor fuel mileage along with low rpm at idle.
Submitted: 8 years ago.Category: Ford
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Answered in 40 minutes by:
2/12/2010
Ford Mechanic: Chuck, ASE Certified Technician replied 8 years ago
Chuck
Chuck, ASE Certified Technician
Category: Ford
Satisfied Customers: 2,101
Experience: 33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
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Your problem is most likely caused by the P0102 and P0113 code.

 

The P0102 code means that the MAF voltage was 0.23V or lower during test and P0113 means the inlet air temp voltage was above 4.6V. The inlet air temp sensor is part of the MAF on this vehicle.

 

Here is a copy of the wiring schematic for the MAF sensor

 

graphic

 

Unplug the MAF sensor and make sure you have 12V on the RD wire and ground on the GY/RD wire and the BK wire. If this is ok then unplug the PCM then ohm the other 3 wires from the PCM to the MAF. Or take a test light and hook it to battery power then hook it to these 3 wires one at a time with the PCM and MAF unplugged. If it lights you have a short to ground. If it does not light then go to the other end of the circuit and take a jumper wire and ground it then your light should light. This will prove out the wires.

 

the P0171 and P0174 codes are probably being set because of this problem.

Chuck
Chuck, ASE Certified Technician
Category: Ford
Satisfied Customers: 2,101
Experience: 33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
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