Has no codes
SOURCE: 1992 pontiac starts, quietly dies and backfires loudly on restart
It sounds like to me you are having problems with your fuel injectors. In situations like these there are soooooo many different variables and possible problems, but the fact that the car is backfiring makes me believe that you are getting too much fuel in because that is what makes are car backfire. When fuel makes it to the cat converter or muffler it will burn there and cause the backfire. My suggestion would be to start the process of elimination with a good fuel injector cleaner. The only one that recommend is called Greased Lightening and can be purchased at Napa and O'Reilley auto parts. If you don't have one of these near you I would go with Techron. Let me know if I can help you with anything else. Thanks for letting me help you with your problem and I would appreciate an honest rating on the help that I gave you. Thanks for using FixYa!
SOURCE: 97 pontiac bonniville has repair code p0171
P0171 - Fuel Trim System Lean Bank 1
I recommend inspecting these following areas for faults.
1. Inspect the vacuum hoses for splits, kinks,and proper connections.
2. Inspect the crankcase ventilation valve and system for leaks.
3. Inspect the fuel for contaminates
4. Inspect the PCM and sensor grounds. make sure they are clean, tight and in the proper locations.
5. Inspect the air induction system after the MAF sensor section for vacuum leaks as well
6. Inspect for engine mechanical failure.
7. Inspect the bank 1 exhaust for leaks, missing or loose exhaust hardware,
8. Inspect the bank 1 HO2S. Make sure it is installed correctly and the electrical connectors are not touching the exhaust system or ignition wires,
9. Inspect for vacuum leaks that will only affect bank 1, such as the intake manifold area, injector O rings, etc..
If you notice any faults or damaged hardware, replace it asap.
SOURCE: cam & crank sensor code intermitten spark 2.4
check timing marks on cam sprocket,could be one tooth 'retarded'.
SOURCE: after changing fuel pump 2 days ago on my 97
You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.
There are two basic types of mass airflow sensors: hot wire and hot
film. In the first type, a very thin wire (about 0.2 mm thick) is used
as the heated element.
Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company.
The element temperature is set at 100° to 200°C above
incoming air temperature. Each time the ignition switch is turned to
the off position, the wire is heated to approximately 1,000°C for 1
second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C
above ambient air temperatures. It does not require a burn-off period
and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles
with EFI. All intake air must flow through the sensor. Some MAF sensors
are called volume air flow meters
A voltmeter connected to measure the signal from a MAF sensor. Reproduced with permission from Fluke Corporation.
Move the MAF sensor air vane from open to close to test it. Reproduced with permission from Fluke Corporation.
WARNING
While pushing the mass air flow sensor vane open and closed, be careful not to mark or damage the vane or sensor housing.
Ohmmeter connections to a MAF sensor. Reprinted with permission.
Resistance specifications for a typical MAF sensor with door open and closed. Reprinted with permission.
The trace of a defective vane-type MAF sensor. Reproduced with permission from Fluke Corporation.
Hot-Wire-Type MAF Sensors
The test procedure for heated resistor and hot-wire MAF sensors
varies depending on the vehicle make and year. Always follow the test
procedure in the appropriate service manual. A frequency test may be
performed on some MAF sensors, such as the AC Delco MAF on some General
Motors' products.
Satisfactory and unsatisfactory MAF sensor frequency readings. Reproduced with permission from Fluke Corporation.
A normal trace for a frequency-varying MAF sensor. Courtesy of Progressive Diagnostics--WaveFile AutoPro.
The trace of a defective frequency-varying MAF sensor. Courtesy of EDGE Diagnostics Systems.
There is also a
Mass Air Flow (MAF) Burn-Off Module Operation:
A semi-conductor control for an electronic-ignition system.
SOURCE: i have a 92 pontiac bonniville and it dies while
I had the same problem with mine. Have your mechanic check or change the following, The wire harness connector that goes to your coil pack, your coil pack, crank and cam sensor. If you find that it happens right after refueling,check and /or replace the fuel filter and make sure your fuel tank is clean. If the tank looks too rusty and corroded it is probably leaking too. Replace as well.
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