Nov 202016

2006 Ford Five HundredI used the OBD II / EOBD CODE READER and found the following code(4 error codes)
P0171 System too lean Bank 1
P0374 Timing Reference Hig n Resolution Signal A No Pulses
P0171 System too lean Bank 1
P0374 Timing Reference Hig n Resolution Signal A No Pulses
The same code reader gave me RPM(rpm): 705.50 while the engine was running but the gear was in Parked position

I don’t feel anything while driving the 2006 Ford Five hundred SEL (I don’t have much knowledge about vehicles). It accelerates well and goes easily to 40miles per hour when given the acceleration (I have not tried beyond 40 miles/hr in order to avoid any damage, as I bought it recently and want to repair it before use). The odometer reads about 200,000 miles.  I showed to a local mechanic he said the gear is either in 2nd or 3rd (limp mode) after a short test drive, which made me little worried, what can be the possible reasons of this errors and what should I do to make it a smooth running vehicle?


Not sure if you made an error yourself when posting the codes but you show only 2 codes and posted them twice. None of the codes indicate anything to do with the transmission. There shouldn’t be any correlation between the two codes. So, look at them separately. As for code p0374 the Optical sensors are the camshaft and crankshaft sensors.

Ford Code P0171 – Fuel Injection System Too Lean Bank 1

Code P0171 Possible causes

– Intake air leaks
– Faulty front heated oxygen sensor
– Ignition misfiring
– Faulty fuel injectors
– Exhaust gas leaks
– Incorrect fuel pressure
– Lack of fuel
– Faulty Mass Air Flow (MAF) sensor
– Incorrect Positive Crankcase Ventilation (PCV) hose connection

Code P0374 – Timing Reference High Resolution Signal ‘A’ No Pulses

 Code P0374 Description

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing. This test monitors the number of high resolution pulses which have been missed (not detected). It’s based on a comparison between the number of pulses that were detected since the last pump cam pulse and the number of the pulses that should have occurred. There are approximately 64 high resolution pulses for every cam pulse.

Code P0374 Possible causes

– Timing Reference Optical Sensor harness is open or shorted
– Timing Reference Optical Sensor circuit poor electrical connection
– Faulty Timing Reference Optical Sensor
– Damaged Powertrain Control Module (PCM)
Sensor Location Diagram
Nov 152016

1992 Ford FestivaRepeatedly blowing distributor coil


Check and clean your connections. Check your wiring harness. Specifically your ground connections. The yellow/Green wire is the negative side and the Black/White wire is the positive side of the coil.

distributor coil diagram 1992 Ford Festiva

Distributor Coil Power Source

Disconnect primary wires at ignition coil. Turn ignition on. Measure between Black/White wire on harness connector and ground, If voltage is not greater than 10 volts, check battery feed, ignition switch and fusible links. If voltage is greater than 10 volts check coil resistance.

How to Test Distributor Coil

Using a multi-meter, measure resistance between primary terminals of coil. Measure resistance between positive primary terminal and coil tower.

  • Primary (Ohms) = 0.8 – 1.6
  • Secondary (Ohms) = 6000 – 30,000

Verify resistance between coil case and primary terminal is infinite. Replace coil if resistance measurements are not within specifications.

Nov 142016

1998 Ford WindstarMy dome light will not go off. I made sure all doors are closed good. and the door jams is clean


The most common reason would be from a failed door ajar switch(door open warning lamp switch). The switch is located on the door latch assembly.

door ajar switch

Door Courtesy Lamp Switch Input/ Door Ajar Switch

System responds to door ajar switch as follows:
•The generic electronic module (GEM) uses the door ajar switch input for two different rear air suspension system functions:
◾preventing vents when a door is open to avoid the possibility of the vehicle lowering and the door catching on an obstruction.
◾servicing a correction immediately, if needed.
•The liftgate and both front door switches close to ground when opened, while the sliding door switch provides ground when closed and opening the door provides an open in the circuit.
•The GEM can sense each door (open or closed) independently.
•If a damaged door ajar switch (door always open) condition exists, the GEM will interpret that a door is open and not vent unless vehicle speed is above 24 km/h (15 mph).
◾Above 24 km/h (15 mph) the GEM disregards all door signals.

Nov 112016

Ford RangerWhat would cause the rear transmission seal to blow?


  1. Age of the seal – old seal tend to dry out and rot and sometimes just wear out
  2. Clogged vent on top of transmission
  3. Overfill transmission fluid
  4. Worn internal bearings in transmission
  5. Worn out put shaft yoke

Rear Transmission Seal Replacement

Description Tool Number
Seal Remover T74P-77248-A
Impact Slide Hammer T50T-100-A
Extension Housing Seal Replacer T61L-7657-A



  1. Raise the vehicle on a hoist and position suitable safety stands under vehicle.
  1. Remove the rear driveshaft.
  1. Use Seal Remover T74P-77248-A and Impact Slide Hammer T50T-100-A to remove the yoke to flange seal (7B215) for the rear output shaft from the transfer case. Discard the yoke to flange seal.

rear transmission seal


  1. Lubricate the yoke to flange seal with Motorcraft MERCON® Multi-Purpose Automatic Transmission Fluid XT-2-QDX or equivalent MERCON® fluid.
  1. NOTE: In the following step, install the yoke to flange seal so that the hole in the bottom of the yoke to flange seal is at the six o’clock position. Use Extension Housing Seal Replacer T61L-7657-A to install the rear yoke to flange seal in the transfer case. Make sure the slot in the tool is installed over the tab on the yoke to flange seal.
  1. Install the rear driveshaft.
  1. Remove safety stands and lower the vehicle.

seal replacer tool 1997 Ford Ranger

Nov 082016

2001 Ford FocusHi. I was traveling from California to Oklahoma, and right when I crossed the Oklahoma state line, I pushed the brakes, and all of a sudden my powertrain light flashed and there was no power to the car for a split second. And then it immediately started driving normally. It didn’t happen again for a month. Now, I’m on my way back to California, and I went to switch off my headlights and all the needles on the gauges started going crazy. So I switched my headlights back on and once again the powertrain warning light flashed. The car lost power for a second, but then immediately went back to normal and my gauges are fine if I keep my headlights on. Any idea what my problem may be?


When the powertrain malfunction warning comes on then the engine management has detected a fault with a sensor or actuator, this will store a fault code in the engine management memory. It will be necessary to have a scan tool in order to extract the engine trouble codes from your vehicle. Just about any local auto parts store will do this for free. Post the codes below in the comments for more information.

Nov 042016

1999 Ford Explorerhey, I’m throwing code p0171 on my 1999 Ford Explorer 4.0 EFI. So I looked it up and did a few things. I cleaned the MAF sensor and replaced the air filter, that did not keep code out. So I replaced the oxygen sensor on bank 1. Not sure where else to look. I do know that the engine seems to be running fine however it is using a little more gas then normal. I do know that my fuel neck needs to be replaced because after we replaced the oxygen sensor on bank 1 it threw a code for large evap leak and whenever your standing back by the fuel cap you can smell a little fuel vapors. Can the fuel neck be causing the computer to throw a p0171 code?



Most likely reason for code P0171 would be an intake leak. The intake gaskets are little rubber o-ring style gaskets. It is common for them to fail at this age.

Ford Code P0171  – Fuel Injection System Too Lean Bank 1

Ford Code P0171 Possible causes

Ford Code P0171 Description

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).

Nov 032016

2013 Ford MustangSometimes when I turn my key in my Mustang’s ignition, there’s a millisecond where nothing happens. Then it starts up fine. Any idea what the problem might be? I’m afraid one day it won’t start.


Most likely cause would be the starter relay sticking. Seems like that would be the cheapest part also. It could also be an indication of a loose connection at the battery or starter. Make sure there is no corrosion around the battery connections. I have added the starting system wiring diagram to help give you a better idea of the components involved in the starting process.

Starting System Wiring Diagram 2013 Ford Mustang

Starting System — Starter Motor

The starting system consists of the following:

  • Starter motor
  • Starter motor relay (located in the Battery Junction Box (BJB) )
  • Battery and battery cables
  • Digital Transmission Range (TR) sensor (automatic transmission-equipped vehicles) (located in the transmission) or Clutch Pedal Position (CPP) switch (manual transmission-equipped vehicles) (located on the clutch pedal)
  • Ignition switch
  • PCM (located in the engine compartment, attached to the BJB )
Nov 022016

2002 Ford Mustang GTEver since my gas gauge hit 1/2 a tank since last fill-up, when my car idles around 500 at a stop light the gauge will fluctuate. I have to put car in neutral to stop is from happening, as well I noticed my MPG is way off on this tank of gas.


If this doesn’t correct itself you may need to replace the fuel level sending unit. The fuel gauge sending unit is attached to the side of the fuel pump module. It is located inside the fuel tank. Removal of the fuel tank is required.

Replace Fuel Pump/ Fuel Gauge Sending Unit 2002 Ford Mustang GT

Oct 312016

1993 Ford Explorer SportMy engine will not idle when cold. It will start and idle rather well if head bolt heater is used to warm engine first. It seems to run real rich. Also loses power on hills. It runs rough at certain speeds on highway.



Sounds like the ECT – Engine Coolant Temperature Sensor may be giving you an issue. First I would pull any existing engine codes. Post any of the codes found below in the comments. This will help narrow down any issue related to the engine. The good news is, this can be done without a scan tool. Do to this I have added a link to explain how to go about doing just that.

Engine Will Not Idle

Idle Speed Adjustment

The engine utilizes sophisticated multi-port fuel injection systems in which an engine control computer utilizes information from various sensors to control idle speed and air fuel mixtures. No periodic adjustments are either necessary or possible on these systems.

Idle Air Control

The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body.  This valve allows air, determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed. A vacuum leak will disrupt the ability to do its job cause it will be fighting itself.