Question about 2003 Ford F250 Super Duty Crew Cab

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Sudden lack of power and pings when i get into the pedel replaced maf sensor and fuel pressure is good.

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Check timing and also make sure your running a good grade of gass. If the octane is low or the gas is watered down you will have similar problems, use some water remover and see if that helps

Posted on Jul 17, 2010


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Lean code cel flashing and lack of power what is the most likely csuse

You will more than likely not notice any drivability problems, although there may be symptoms such as: a lack of power detonation (spark knock) rough idle hesitation/surge on acceleration. Causes A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor Possible Solutions A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. If you're on a tight budget, start there, but that may not be the fix for certain. So, possible solutions include: Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect all vacuum and PCV hoses, replace/repair as required Inspect all hoses and connections in the air intake system Inspect and/or test the intake manifold gaskets for leakage Check for a dirty fuel filter and proper fuel pressure Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool If you have access, you may want to run a smoke test

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Sep 09, 2016 | Cars & Trucks

1 Answer

P0171 2006 Honda cr v

Possible causes are as follows, I suspect you have an intake air/vacuum leak or a faulty MAF sensor. - 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

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Mar 24, 2014 | 2006 Honda CR-V SE

1 Answer

Sputters and backfires when full pedal apilled

Year make and model ? Have you checked base fuel pressure hot and cold ?
Some of the components you replaced only adjust fuel mixture, while the MAF and TPS would directly affect acceleration. If any of the sensors were faulty you should have trouble codes. So fuel pressure and volume are often suspect. You could also use starting fluid sprayed into the intake to verify the problem is lack of fuel.

Jan 18, 2014 | Cars & Trucks

1 Answer

When took the car for diagnosis, results displays camshaft positionong sensor A circuit bank 1 range performance, could this be the lack of take off power audi a4

The crank shaft position sensor is to tell the cpu when to allow spark at the right time. IT normally works or it doesn't. Lack of take power for take off can be associated with low fuel pressure for the injectors and MAF/MAF sensor faults.. have a pressure test done on the fuel system to check for regulator failure.

Aug 23, 2013 | Audi A4 Cars & Trucks

1 Answer


What is base fuel pressure at idle ?

Apr 14, 2013 | 1991 Buick Park Avenue

1 Answer

All of a sudden my 2004 mercury grand marquis with 55000 miles idles rough. Not really noticeable when driving but do believe there is a lack of power and mpg seems to have declined. Can u help???

The vehicle is 7 years old

The spark plugs should have been changed at 60,000
Gas filter every 3 years
Air Filter every 3 years or sooner
The MAF Sensor cleaned every year
By now the O2 Sensors are slow to respond
If they have 100,000 change the front 2 sensors
Check TPS Voltage
Check Fuel Pressure at the fuel rail
Egr Valve most likely bad
If you have COP Ignition Coils, they may be misfiring,
common ford problem

Unrelated--change trans and power steering fluids
every 3 years,never go over 30,000 miles on any vehicle

Jan 26, 2011 | 2004 Mercury Grand Marquis

1 Answer

My 97 mercury cougar xr7 is burning way too rich and is idleing rough.what can i do

Get a PCM test for fault codes. It could be an oxygen sensor or MAF sensor. Free test at AUtozone if check engine light is on.
Clean MAF sensor heated wires with carb cleaner by spraying seveal times. Do not brush it. Disconnect battery for 2 hours and then drive for 10 miles after hook up.

SERVICE TIP MASS AIR FLOW (MAF) DISCUSSION MAF sensors can get contaminated from a variety of sources: dirt, oil, silicon, spider webs, potting compound from the sensor itself, etc. When a MAF sensor gets contaminated, it skews the transfer function such that the sensor over-estimates air flow at idle (causes the fuel system to go rich) and under-estimates air flow at high air flows (causes fuel system to go lean). This means Long Term Fuel Trims will learn lean (negative) corrections at idle and learn rich (positive) corrections at higher air flows. If vehicle is driven at Wide Open Throttle (WOT) or high loads, the fuel system normally goes open loop rich to provide maximum power. If the MAF sensor is contaminated, the fuel system will actually be lean because of under-estimated air flow. During open loop fuel operation, the vehicle applies Long Term Fuel Trim corrections that have been learned during closed loop operation. These corrections are often lean corrections learned at lower air flows. This combination of under-estimated air flow and lean fuel trim corrections can result in spark knock/detonation and lack of power concerns at WOT and high loads. One of the indicators for diagnosing this condition is barometric pressure. Barometric pressure (BARO) is inferred by the Powertrain Control Module (PCM) software at part throttle and WOT (there is no actual BARO sensor on MAF-equipped vehicles, except for the 3.8L Supercharged engine). At high air flows, a contaminated MAF sensor will under-estimate air flow coming into the engine, hence the PCM infers that the vehicle is operating at a higher altitude. The BARO reading is stored in Keep Alive Memory (KAM) after it is updated. Other indicators are Long Term Fuel Trim and MAF voltage at idle. NOTE: THE FOLLOWING PROCEDURE MAY ALSO BE USED TO DIAGNOSE VEHICLES THAT DO NOT HAVE FUEL SYSTEM/HO2S SENSOR DTCs. Symptoms
  • Lack of Power
  • Spark Knock/Detonation
  • Buck/****
  • Hesitation/Surge on Acceleration
  • Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0171, P0172, P0174, P0175 may be stored in memory
  • P0171, P0174 (Fuel system lean, Bank 1 or 2)
  • P0172, P0175 (Fuel system rich, Bank 1 or 2)
  • P1130, P1131, P1132, (HO2S11 lack of switching, Bank 1)
  • P1150, P1151, P1152, (HO2S21 lack of switching, Bank 2)
  • 181, 189 (Fuel system lean, Bank 1 or 2)
  • 179, 188 (Fuel system rich, Bank 1 or 2)
  • 171, 172, 173 (HO2S11 lack of switching, Bank 1)
  • 175, 176, 177 (HO2S21 lack of switching, Bank 2)
  • 184, 185 (MAF higher/lower than expected)
  • 186, 187 (Injector pulse width higher/lower than expected)
  1. Look at the BARO PID. Refer to the Barometric Pressure Reference Chart in this article. At sea level, BARO should read about 159 Hz (29.91 in. Hg). As a reference, Denver, Colorado at 1524 meters (5000 ft.) altitude should be about 144 Hz (24.88 in. Hg.). Normal learned BARO variability is up to ±6 Hz (±2 in. Hg.). If BARO indicates a higher altitude than you are at (7 or more Hz lower than expected), you may have MAF contamination. If available, Service Bay Diagnostic System (SBDS) has a Manifold Absolute Pressure (MAP) sensor that can be used as a barometric pressure reference. Use "MAP/BARO" test under "Powertrain," "Testers and Meters." Ignore the hookup screen. Connect GP2 to the reference MAP on the following screen. NOTE: REMEMBER THAT MOST WEATHER SERVICES REPORT A LOCAL BAROMETRIC PRESSURE THAT HAS BEEN CORRECTED TO SEA LEVEL. THE BARO PID, ON THE OTHER HAND, REPORTS THE ACTUAL BAROMETRIC PRESSURE FOR THE ALTITUDE THE VEHICLE IS BEING OPERATED IN. LOCAL WEATHER CONDITIONS (HIGH AND LOW PRESSURE AREAS) WILL CHANGE THE LOCAL BAROMETRIC PRESSURE BY SEVERAL INCHES OF MERCURY (±3 Hz, ±1 in. Hg.). NOTE: BARO IS UPDATED ONLY WHEN THE VEHICLE IS AT HIGH THROTTLE OPENINGS. THEREFORE, A VEHICLE WHICH IS DRIVEN DOWN FROM A HIGHER ALTITUDE MAY NOT HAVE HAD AN OPPORTUNITY TO UPDATE THE BARO VALUE IN KAM. IF YOU ARE NOT CONFIDENT THAT BARO HAS BEEN UPDATED, PERFORM THREE OR FOUR HEAVY, SUSTAINED ACCELERATIONS AT GREATER THAN HALF-THROTTLE TO ALLOW BARO TO UPDATE.

May 01, 2010 | 1997 Mercury Cougar XR7

1 Answer

Car will turn off when the gas pedel is released

gee where to start....fuel filter, O2 sensor,map or maf sensor, egr valve, get a fuel pressure tester and check psi at fuel rail. (35 to 45 psi. key on - engine off).

Nov 04, 2009 | 1999 Ford Explorer

2 Answers

1993 Lexus Ls400 loss of power at 2500-3000rpm

Check your MAF and MAP sensor. The first 80% of your throttle signal from the TPS works with the O2 sensor to try to keep the air fuel ratio to 14.7 to 1 with the ECM controlling the fuel injector spray time and timing the ignition. After the 80% to WOT the ECM puts the O2 sensor in to an open loop and takes the Reading form the MAF and MAP sensor to run the engine richer so there will not be any Detonation to the engine and burning holes in the valves for running too lean. That is why it always feel like you get a little more when you ease off on the gas peddle from WOT. Recap check the TPS, MAF,and MAP sensor and wires to those sensors, if you can get the car scanned that would be great and you may find out which sensor may have gone bad, the other thing to is the fuel pressure regulator may be going bad and at WOT the pressure may be to high causing it to run to rich causing the loss of power. Good luck and hope this helps. 

Jul 04, 2009 | 1991 Lexus LS 400

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