Question about Ford F-150

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I have replaced egr valve and mass flow air sensor and egr sylinoid and have replaced catylatic converters. Truck still sputters. I have put new plugs, wires, and distributer cap and button. Truck fells like it doesn't have power. Truck is in time. valves chatters when under load or press on gas pedal hard what can i do

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I recommend you test your fuel pressure to see if it fluctuates any.If it were to be any of the other sensors you would have a check engine light that would come on.The only system that doesn't have any sensors would be your fuel system unless it has a fuel pressure sensor and you would have a light for that also.I would take a look at your fuel pump and filter.Also have your injectors balance tested this will tell you if you have any bad injectors or pressure regulator.

Posted on Mar 13, 2011

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I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
  • Air leak between MAF sensor and throttle body
  • TP sensor not seated properly
  • Damaged TP sensor
  • Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Mar 09, 2015 | 1998 Ford Windstar

1 Answer

1999 olds alero is sputtering i replaced the plugs and wires its still sputtering i get a po300 code


CODE PO300 MULTIPLE ENGINE MISFIRE DETECTED CONDITIONS. POSSIBLE CAUSES.WEAK FUEL PUMP.STOPPED UP FUEL FILTER.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI. THE MASS AIR FLOW SENSOR CONTAMINATED CAUSE VERY LEAN CONDITIONS.EGR VALVE STUCK OPEN OR PVC VALVE HAS VACUUM LEAK. THE EVAP SYSTEM CANISTER FUEL SOAKED.

Mar 12, 2011 | 1999 Oldsmobile Alero

1 Answer

The vehicle was put on a diagnostic machine for loss of power and it coded the o2 sensor, and the mass air flow, and EGR valve. We put a new o2 sensor in and cleaned the mass air flow. It ran, but no...


no-- but could mean that the O2 sensor is not correct
it is a common misconception that all of the oxygen sensor are the same
the fact is that even they are known a oxygen sensors there are 2 completely different units
the sensor in the exhaust manifold before the cat converter is in fact a heated oxygen sensor and it's function is to report the exhaust composition so that the ecm can adjust the air/fuel mixture
the other is an o2 sensor located after the cat converter and fine tunes the system after the cat converter has done it's job
if the cat converter is faulty , the o2 sensor will try to have the ECM correct the mixture
the loss of power if it is a cat converter comes from a blocked exhaust system and that is most evident at high rpms or under power

May 04, 2017 | 1996 Suzuki X-90

1 Answer

OBDII SETS CODES P0401, P0171 & P0174 . 1998 Mercury Sable


P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve
Code P0171- Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem P0174- Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

Jun 28, 2010 | 1998 Mercury Sable

2 Answers

Nissan Xterra EGR valve troubleshoot


check the EGR by disconnecting it to see if there is a change in the engine at idle

Oct 03, 2009 | 2006 Nissan Xterra

1 Answer

I have a 97 blazer with 186000 4.3,it stalls when it gets warmed up.I have replaced 2 O2 sen.,EGR,mass air sen., and wires,rotor and cap. I have checked fuel filter(clear) Cat. converter,and fuel pressure...


Hi,
It was something that takes a lot of time and money to diagnose.Emissions requires the truck to have an EGR valve (exhaust gas recycle) and this deposits gunk (carbon residue) on your MAF (mass air flow sensor) If you catch it in time you can use a carbon cleaner from Autozone or checker Lightly on the MassAirFlow sensor. If not in time you may have to have either the MAF or EGR valve replaced and these are expensive. After a long period of time being undetected eventually the EGR valve will start smelling like sulfer, this means its to late to clean and save.

Thanks for contacting Fixya.

Jul 26, 2009 | Chevrolet Blazer Cars & Trucks

1 Answer

Check engine light


O.k. This is generally caused by the mass air flow sensor, that's always first. There is a small belt driven air pump that has a couple of hoses that come off of it and route to the intake (or to the top of the engine) and the exhaust, there are in line check valves on the hoses. This system directs air either to the heads or the cats (catylatic converters). Check to see if the pump has gone out, a check valve is stuck, a hose has collapsed or is cracked/broken allowing air to escape, or if a vacuum hose, that runs to it, is cracked/broken or come loose, and sucking air. This is just an emissions requirement, and when this happens it generally doesn't make the car run any differently, it just throws a code. CHeck these and let me know

Jul 29, 2008 | 1996 Ford F150 Regular Cab

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