Question about 2004 Chevrolet Cavalier

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Engine cranks but won't start, Has OBD II code of P0172. Can hear the fuel pump and have checked the purge solnoid. Prior to this, the rpms were raising,but lacked power. Have pulled O2 sensor pri

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  • Chevrolet Master
  • 14,363 Answers

Trouble Code: P0172

Fuel System Rich (Bank 1)

Possible Causes:


Base engine "mechanical" fault affecting one or more cylindersEVAP system component has failed or canister fuel saturatedFuel control sensor is out of calibration (i.e., ECT, IAT or MAP)Fuel system supplying too much fuel at idle speed or at cruiseFuel injector(s) is leaking or stuck partially open (one or more)HO2S is contaminated, deteriorated or it has failed.Ok Rusty,your mission is to figure and fix,got to go to work in the morning,good luck,this message will self distruct when repair is made.

Posted on Jan 06, 2013

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6ya6ya
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Posted on Jan 02, 2017

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Tnsiouxfalls
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SOURCE: S10 blazer lacks power, bogs under acceleration

Check your coil output, buy a cheep spark tester. Pull of a spark plug wire and plug in the tester(ground the other end), set it to bridge a gap for 30,000 volts.Have someone start it and make sure the spark will jump the gap on the tester.Danger-Very high voltage! It will light you up if your touching the tester while the car is running!You'll be able to see a bright blue spark(and hear it as well) if your coil is good.If it's a yellow thin spark it's probably the coil.
If you have good spark, check the fuel filter and fuel pressure at the fuel rail.
Back firing could be timing,cam position or crank position sensor.Worst case scenario, timing chain or belt.

Posted on Jul 27, 2009

  • 645 Answers

SOURCE: have replaced fuel pump, relay & fuel filter.

have you checked to see if you have a bad came or lifter. that would make it backfire. if it kind of spits fuel it maybe cam. if it throws fire than it could be timing like a bad chain.

Posted on Feb 12, 2010

  • 24 Answers

SOURCE: 1999 Chevy Malibu 2.4L. Ran fine, changed the

RECHECK WIRING AND CONNECTIONS..LOAD TEST THE BAT MUST STAYIN HE GREEN FOR 15 SEC. WHILE ESTING OR HAVE 600 CCA. MIN THEN RECHECK FOR SPARK ..










Posted on Mar 20, 2010

  • 1608 Answers

SOURCE: i have a '97 chevy tahoe. the engine cranks, but

What you need to do is check for fuel pressure.The pressure should be 60-66 for central sequential fuel injection and 56-62 for sequential fuel injection.If pressure is good then check for spark at the spark plugs.If you don`t have a way to check for fuel pressure then tap on the gas tank bottom with your foot or hammer while someone is turning the key and trying to start the vehicle.If it starts then replace the fuel pump.If this is good then check coil and ignition module if you are not getting spark.Hope this helps.Good luck.























Posted on Mar 29, 2010

wexternplaye
  • 1 Answer

SOURCE: needed o2 sensor now car wont start at all. check engine light was flashing prior to cutting off. whats wrong

the diesel didnt do anything to the motor unfortanatly it did fry you gas pump and probably clog your injectors that why it wont start, its not getting any gas to the chambers

Posted on Apr 25, 2012

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1 Answer

P0172 code. Check Engine light on. Vehicle will not start now


What make and model car ? P0172 OBD II Trouble Code could be running so rich that it fouled the sparks . Pull out the spark plugs and see if there are wet with fuel and black, means that they are fouled out. Have to be cleaned or replaced . I don't know the make of vehicle , so I can only give approximation what mite have caused this , a fuel pressure regulator with a ruptured diaphragm leaking fuel into the intake manifold, leaking fuel injectors P0172 System Too Rich Bank 1

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Light check engine obd p0172


Error Code: P0172
Fault Location:
Fuel Trim, System too Rich, Bank 1
Possible Cause:
Evaporation emission (EVAP) canister purge valve.
Fuel pressure.
Fuel Injector(s).
Heated oxygen sensor (HO2S).
Mass air flow sensor.
Engine coolant temperature sensor.
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92 grand caravan starts poorly, then runs ok when warmed up, then poorly after 30 min. to 1 hr. of driving. Then stalls and won't start till 30 min. or so later.


Hello
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM

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Car cranks ok but won't start.


code p 0440 refers to evaporative emission (EVAP) m system--malfunction===causes ---hose connections ---intake leak---EVAP canister purge valve
at this point I would be considering the purge valve as the problem as what you may be getting is a vacuum in the tank from the valve not venting properly and that would not allow the pump to function and eventually would starve the injectors

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Check fuses first, but could be needs new CPU

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Will an obd II reader come out with codes for problems even if the check engine light isn't on?


I think you have a defective fuel pump pressure check valve here. If you don't have a check engine light on you will not have any codes.

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1994 Chevrolet Lumina 3.1 will not start - after starting with ether runs fine.... 1994 Lumina 3.1 will not start - cranks but won't start. While cranking shoot ether into intake - starts...


Had friend put OBD diagnostics to it and error code indicated fuel pump ????? No code indicates replacing any part . Indicates testing ! pressure and flow testing , voltage drop testing the electrical circuit etc... There is a check valve in the fuel pump assembly that is suppose to keep pressure in the fuel lines an fuel rail . When the check valve goes bad allows fuel to drain back into the tank. Try turn the key on an off a few times to build up pressure . The PCM energizes the fuel pump relay for two seconds at key on .

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Can't get my 96 chev s-10 to pass inspection due to Not ready codes. I recently change the battery and have driven the veh about 200 miles. Autozone checked and said it was all good but the state...


Here is the drive cycle procedure for that vehicle, and let me know if you require any further assistance.


Running an OBD-II Drive Cycle

The purpose of the OBD-II drive cycle is to run all of the onboard diagnostics. The drive cycle should be perfomed when any trouble codes are erased from the PCM or if the battery was dis-connected. Performing the drive cycle will reset the monitors so that any further trouble codes can be detected.

The OBD-II system drive cycle begins with a cold start with the coolant temperature below 120 degrees F. and the coolant and the air temperature sensors within 10 degrees of each other. (The ignition key must not be "on" or in the "Run" position until the cold start or the heated O2 sensor diagnostic might not start)

1. As soon as the vehicle starts up, idle the engine in drive for two and a half minutes with the AC and the rear defrost on if equipped with a rear window defroster. The OBD-II will check the O2 sensor circuits, the air pump, and the EVAP purge.

2. After the two and a half minutes turn off the AC and the rear window defrost, and then accelerate to 55 mph at half throttle. OBD-II checks for any ignition mis-fires, fuel trim, and canister purge.

3. Hold steady at 55 mph for three minutes. OBD-II monitors the EGR system, the air pump, the O2 sensors and the canister purge.

4. After the three minutes decelerate down to 20 mph without using the brakes or the clutch. OBD-II checks the EGR and the purge functions.

5. Accelerate back up to 55 mph at half throttle. OBD-II checks for mis-fires, fuel trim, and purge functions again.

6. Hold steady at 55 mph for five minutes. OBD-II will monitor catalytic converter efficiency, for any mis-fires, EGR function, fuel trim, O2 sensor operation, and purge functions.

7. Decelerate to a stiop without using the brakes or the clutch. OBD-II makes a final check of the EGR system and the canister purge functions.

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1 Answer

Missing and cutting out


A fault code reader would be a huge help in diagnosing general problems. It plugs in under left side dash and gives specific failure codes (this is what mechanics use).
You can buy an OBD-I code reader (for cars before 96) online for $79.95 or a OBD-II which reads all cars from 1996 on. It will also reset faults or engine trouble lights.

You may want to check your fuel pressure with a gauge.

or do a simple Fuel pump test:
  1. remove the gas cap.
  2. have one person listen in the gas tank at the gas cap opening.
  3. the other person turns the ignition switch to the ON position ONLY (so the dash lights come on.) Do NOT crank or start up the engine.
  4. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.
If it does NOT run for the 2 seconds every time, the fault is either the fuel pump or fuel pump relay

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OBD II DTC P0172


p0172 is not a volvo code so may not be correct but converted to volvo is code 250a long term fuel upper limit (lean vac leak) ck all vac hoses and replace the canister purge valve mounted on the radiator (about $40.00 part) then reset all codes

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