Question about 2003 Pontiac Grand Am

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My 203 grand am gt has take off power & acceration.i have recently changed the following sensors: mass air flow,egr valve&selinod. the check engine light is on.i cant go over 70mph on the highway going up steep hills it putters really bad no loud noises,doesnt have no problems going into gear except on the highway when i try too stomp on gas,the rpm goes up but no power.the rpm is about 500-1000@a standing idle&2000-2500 between 45-70mph except up hills&sudden burst of acceleration

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6ya6ya
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Posted on Jan 02, 2017

  • 148 Answers

SOURCE: poor idle on my 2000 grand am gt

egr valve,or throttle position sensor

Posted on Jul 07, 2008

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com

Posted on Oct 17, 2008

ElDopa
  • 295 Answers

SOURCE: CODE PO102 after Mass Air Flow Sensor replaced

Most faultcodes don't disappear automaticly, the have to be 'reset' manually after repairing. It sounds like the code didn't get erased after replacing the MAF. You could try to disconnect the battery for 10 minutes (disconnect and reconnect the negative (-) pole), which should erase the code.

Whenever the engine light still comes back on after that, there probably still is some (other) problem ...

Posted on Aug 24, 2009

  • 4 Answers

SOURCE: poor acceleration while trying to pass and check engine light on

You said it struggles between 2500 and 3000 RPM. checking the hose for vaccuum at idle won't work. Rev the engine to the problem RPMs and check. That will tell you about vaccuum. As for where it goes, it won't go in the same palce as the brake booster. There will be another connector. If the re is a T there now, it sounds like someone else may have changed things around.

Posted on Sep 14, 2009

  • 617 Answers

SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP

3.1 or 3.8 motor, mass air flow is in the fresh air (goes from air cleaner to engine)

Posted on Feb 07, 2010

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97 Grand am v6 up & down idle. Driving =steady acceleration. I've changed, O2 sensor, throttle positioning sensor. Scan is still saying Random misfires? Get warm won't start.


P0300 Random misfire - lean condition , vacuum leak , low fuel pressure , fuel filter plugged partially , mass air flow sensor .
If the misfire is random, check for the following conditions:
?€¢
System Grounds: Ensure all connections are clean and properly tightened.


?€¢
MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.


?€¢
Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.


?€¢
Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.


?€¢
Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.


?€¢
EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Oct 21, 2015 | Cars & Trucks

2 Answers

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

98 Grand Am GT 3.1 engine Very high idle when started. Sometimes you can shut it off and restart it and it will idle fine. Also using lots of gas. Have changed TPS, Iac, and EGR valve. No vacuum leaks can...


MASS AIR FLOW CAN CAUSE PROBLEMS IF ITS DIRTY OR SKEWED .YOUR IDLE AIR INLET PASSAGES OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.BESURE REPLACE EGR VALVE GASKET THE OLD GASKET WILL LEAK.CHECK FOR THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.

Dec 30, 2010 | 1998 Pontiac Grand Am

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

Ford Ranger check engine light. I had it diagnosed as an EGR Valve, replaced it and the light cam back on after about 5 miles.


They all say the EGR valve is the problem but most of the time its the mass air fow meter is at fault.So i would recomend changing that.

Dec 29, 2009 | 2000 Ford Ranger SuperCab

1 Answer

2004 jetta tdi, has engine miss & lack of power, has p0101 present, if unplugged has less power, but misses less, already cleaned extremely clogged egr valve, changed engine oil/filter, checked maf...


Running rough?? If i took a guess I'd say there's a faulty injector. Does it smoke like hell ?? Does it also miss at idle?- If so get a line wrench and a rag handy. Start the car and while idling wrap the rag around the base of the fuel line connector on injector 1 and crack it just a bit until fuel comes out. It might spray, thus the rag. If the miss gets worse, that ain't the injector to blame. Continue with the other 3. If you crack a line and there is no or very little change in the miss then you found the guilty party.

On a long shot it could also be a stuck valve.

Did that get it?? It sounds like an issue other than MAF but.... get a multimeter and try probing the connecter to the MAF. When you find out what it is , please let me know. I'm curious

*The key must be on*

pin 1- ignore it
pin 2- gnd = 12-14v
pins 2- 3 = 12-14v
pin 4- gnd = 5v
pins 3- 4 = 5v

P0101 - Mass Air Flow Sensor (G70): Implausible Signal

Possible Symptoms

  • Loss of Power
  • Erratic Idle
Possible Causes
  • Mass Air Flow Sensor (G70) faulty
  • Air Leak(s) after Mass Air Flow Sensor (G70)
  • Intake Air Filter dirty/faulty
  • Ground Spots corroded or Paint Residue
  • Wiring and/or Connections from/to Mass Air Flow Sensor (G70) faulty
Possible Solutions
  • Check Intake Air Filter
  • Check Mass Air Flow Sensor (G70)
  • Check Ground Spots
  • Check Wiring and/or Connections from/to Mass Air Flow Sensor (G70)

Dec 14, 2009 | Volkswagen New Jetta Cars & Trucks

1 Answer

1993 jeep grand cherokee, choking, pulling then stalled,


Check:
- Fresh Air Intake Hose: Clogged or Damaged FreshAir Intake Hose.
- Carburetor: Worn, Faulty or Damaged Carburetor.
- Mass Air Flow Sensor: Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
- EGR Valve: EGR Valve Sticking Open/Leaking.
- Idle Air Control Valve: IAC Valve Sticking or Faulty.

Good luck.

Aug 02, 2009 | 1993 Jeep Grand Cherokee

2 Answers

Engine starts and stalls


1 Inspect EGR Valve EGR Valve Sticking Open/Leaking. 2 Inspect Idle Air Control Valve IAC Valve Sticking or Faulty. 3 Inspect Mass Air Flow Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.

Jul 06, 2009 | 1987 Dodge Ramcharger

1 Answer

Poor idle on my 2000 grand am gt


egr valve,or throttle position sensor

Jul 07, 2008 | 2000 Pontiac Grand Am GT

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