Question about 1996 Dodge Avenger

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Fouling spark plugs with black coating not oil

Suspect over rich fuel condition. No DTC in computer

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I am assuming the mitsubishi 2.5? Most likely it is an oxegyn sensor problem. If they are not reading like they should, it just floods out the car. Could also have a stuck open injector (stays on all the time).

Posted on Mar 11, 2009

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My 2003 pontiac aztek shuts off when its in idle


Could have a vacuum leak , a problem with the IAC - idle air control motor !
Rough, Unstable, or Incorrect Idle and Stalling
Inspection/Test
Action
DEFINITION: Engine runs unevenly at idle. If severe, the engine or vehicle may shake. Engine idle speed may vary in RPM. Either condition may be severe enough to stall the engine.
Preliminary
?€¢
Refer to Diagnostic System Check - Engine Controls .


?€¢
Refer to Intermittent Conditions before starting.


?€¢
Search for bulletins.


?€¢
Observe the owners driving habits.

Fuel System
?€¢
Test the fuel system circuits for proper operation. Refer to Fuel Pump Electrical Circuit Diagnosis .


?€¢
Test for low fuel pressure. Refer to Fuel System Diagnosis .


?€¢
Test for faulty fuel injectors. Refer to Fuel Injector Balance Test with Special Tool , Fuel Injector Balance Test with Tech 2 , Fuel Injector Solenoid Coil Test test procedures.


?€¢
Inspect for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .


?€¢
Inspect for fuel in the pressure regulator vacuum hose.


?€¢
Ensure each injector harness is connected to the correct injector/cylinder.


?€¢
Inspect for any items which may cause an engine to run rich, long term fuel trim is significantly in the negative range. Refer to Diagnostic Aids for DTC P0172 .


?€¢
Inspect for any items which may cause an engine to run lean, long term fuel trim is significantly in the positive range. Refer to Diagnostic Aids for DTC P0171 .

Sensor/System
?€¢
Test for conditions which cause an incorrect idle speed.


-
Throttle body tampering, excessive deposits, or damage--Refer to Fuel System Description .


-
Restricted air intake system


-
Large vacuum leak


?€¢
Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the MAF sensor and the throttle body.


?€¢
Inspect crankcase ventilation valve for proper operation.


?€¢
Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .


?€¢
Monitor the 24X crank sensor and the CMP sensor signal present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.


?€¢
Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted, they may not set a diagnostic trouble code (DTC) immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.


?€¢
Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .


?€¢
Inspect the Transaxle Range Switch input with the vehicle in drive and the gear selector in drive or overdrive


Ignition System
?€¢
Inspect for proper ignition voltage output using the following steps:


1.
Attach the J 26792 Spark Tester to engine ground.


2.
Connect the spark plug end of the spark plug wire to the J 26792 . Leave the other end of the spark plug wire connected to the coil being tested.


3.
Connect the spark plug end of the companion spark plug wire to ground. The companion spark plug wire is the wire attached to the corresponding coil tower.


4.
Crank the engine while observing the J 26792 . A spark should be observed.


5.
Repeat the above steps for each coil.


?€¢
If spark is not present at the coils, inspect for the following conditions:


-
Coils--Cracks, carbon tracking/arcing, or a resistance value outside the specified range

Coil Resistance
5000-8000 ohms (5K-8K ohms)
-
Spark plug wires--Signs of arcing, cross firing, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range

Spark Plug Wire Resistance
9 686 ohms per meter (3,000 ohms per foot)
Important: : Spraying the secondary ignition wires with a light mist of water may help locate an intermittent problem. Ignition voltage will arc to ground when a secondary component is faulty.


-
Defective ignition module


-
Ignition system wiring--Loose ignition module feed or ground connection, or damaged system wiring


?€¢
Remove spark plugs and inspect for the following conditions:


-
Fouled plugs


-
Cracks


-
Wear


-
Improper gap


-
Burned or damaged electrodes


-
Improper heat range or reach


?€¢
If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs. Refer to Spark Plug Inspection .

Sep 27, 2015 | Pontiac Cars & Trucks

1 Answer

My s10 4cyl. i checked the relays ok could the surge be caused by the ignition?


Someone was having fun with you I think, You should have a scan tool hooked up , check the map sensor , O2 sensors . coolant temp. fuel pressure .I don't know what year your S-10 is but , this will work for any year !
1999 Chevrolet S10 Pickup - 2WD ' Blazer, Bravada, Envoy, Jimmy, S10 Pickup, Sonoma (VIN S/T) Service Manual ' Engine ' Engine Controls - 2.2L ' Diagnostic Information and Procedures ' Document ID: 320398
--------------------------------------------------------------------------------
Surges/Chuggles
Surges/Chuggles Checks
Action

DEFINITION: Engine power variation under steady throttle or cruise. Feels like the vehicle speeds up and slows down with no change in the accelerator pedal.

Preliminary
• Refer to the Powertrain On Board Diagnostic (OBD) System Check .
• Refer to Symptoms .
• Search for service bulletins.
• Be sure the driver understands the transmission torque converter clutch, and the A/C compressor operation as explained in the owners manual. Inform the customer how the TCC and the A/C clutch operates.
• Check the PCM grounds for being clean, tight and in their proper location.

Sensor/System
• Check the Oxygen sensor (O2S 1) and the Heated Oxygen Sensor (HO2S 2). The O2S 1 and HO2S 2 should respond quickly to different throttle positions. If not, check the O2S 1 and the HO2S 2 for silicon or other contaminants from fuel or the use of improper RTV sealant. The sensors may have a white powdery coating. Silicon contamination causes a high but false O2S 1 and HO2S 2 signal voltage (rich exhaust indication). The PCM will reduce the amount of fuel delivered to the engine, causing a severe driveability problem. Refer to Oxygen sensor and the Heated Oxygen Sensor in the Information Sensors/Switches Description .
• Check for proper operation of the MAP sensor.
• Check for proper operation of the TP sensor.
• Check for proper operation of the ECT sensor.

Fuel System
• Check the fuel pressure. Refer to Fuel System Diagnosis .
• Check for contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
• Check the fuel filter for being plugged or restricted.
• Ensure each injector harness is connected to the correct injector/cylinder. Refer to Engine Controls Schematics .
• Check items which can cause an engine to run rich (long term fuel trim is significantly in the negative range). Refer to Diagnostic Aids for DTC P0172 Fuel Trim System Rich .
• Check items that can cause an engine to run lean (long term fuel trim is significantly in the positive range). Refer to Diagnostic Aids for DTC P0171 Fuel Trim System Lean .

Ignition System
• Check for proper ignition voltage output with spark tester J 26792 or equivalent.
• Check the spark plugs for the following conditions:
- Check for wet or fuel fouled spark plugs.
- Check for cracks on the spark plugs.
- Check for wear.
- Check for improper spark plug gap.
- Check for burned electrodes or heavy deposits.
• If the spark plugs are fuel or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.
• Check the Ignition Control Module (ICM) for proper ground connection.
• Check the ignition coils for cracks or carbon tracking.
• Check the spark plug wires forproper resistance and condition.

Additional Checks
• Check for proper operation of the TCC. Refer to Torque Converter Diagnosis in Automatic Transmission 4L60-E.
• Check the exhaust system for a possible restriction:
- Inspect the exhaust system for damaged or for possible collapsed pipes.
- Inspect the muffler for heat distress or for possible internal failure.
- Check for possible plugged three-way catalytic converter. Refer to Restricted Exhaust System Check or Exhaust System Inspection in Engine Exhaust.
• Check the vacuum lines for kinks or leaks.
• Check the generator output voltage. Repair the generator if the output voltage is less than 11 volts or more than 16 volts.
• If all procedures have been completed and no malfunctions have not been found, review and inspect the following items:
- Visually and physically inspect all electrical connections within the suspected circuit and/or systems.
- Check scan tool data.
This is information for the professional TEAHNICIAN That has a capably scan tool ! If your not familiar with OBD2 an electronic fuel injection systems I suggest very strongly that you take it to a certified technician !
This

Sep 08, 2015 | Cars & Trucks

1 Answer

Scott, 95 GMC 5.7L keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


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Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

95 GMC 5.7l keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

I have a 4 cyclinder fuel injected vortec engine in my accord ,my car is dumping to much fuel which fouls out my plugs n black fumes is coming from the tail pipe.there is plenty pressure coming from the...


You need to check that the spark plugs are in good condition and check the spark (spark should be blue = good, yellow = weak spark ) Is there an engine light on? if the plugs are black this is a rich condition (to much fuel, or fuel not burning) the spark plug wires could be bad, weak ignitor,

Aug 23, 2011 | 1997 Honda Accord

3 Answers

1995 GMC JIMMY Runs rouph, P0306 stored rich condition, blck smoke out tailpipe


Prob needs a o2 sensor or oxygen sensor they are called

Sep 17, 2009 | 1995 GMC Jimmy

1 Answer

Bad idle


It's probably not the throttle position sensor, but rather the wiring that goes to the sensor. Also your plugs or plug should not be black unless it is oil fouled or carbon fouled. Carbon fouled would indicate an over rich mixture problem. Wet and black would indicate oil fouling. You need to check the oxygen sensor also. A false indication from it would could cause a rich fuel condition. Start with the wiring to the TPS switch. Last but not least check your map sensor and the vacuum hose running to it. All these items contribute to the overall fuel delivery system and how it functions.

Aug 17, 2009 | 1993 Ford Ranger SuperCab

2 Answers

Cyl#3&5 foul plugs 97 suburban good compression all cyl new cap rotor distributor wires plugs module


Fouling occurs when the spark plugs' firing tip becomes coated with excessive fuel, oil, or combustion deposits so that it is unable to produce a spark. A plug can become fouled from continuous low speed driving, improper spark plug heat range (too cold), improper timing (over-retarded), too rich an air/fuel ratio or an oil leak into the combustion chamber. A variety of self-cleaning features are designed into most plugs to reduce fouling.

Jul 17, 2009 | 1999 Daewoo Nubira

2 Answers

Weak spark from dist cap to plugs. spark from coil primary is as it should be. Plugs were carbon fouled from rich condition. this is a 92 bronco 5.8 windsor motor.changed out plugs,cap,rotor,and remote tfi...


The engine is definitely in an over rich fuel condition if you are blowing black smoke. I would suspect a bad 02 sensor, but the flooding condition you describe at starting could be other things. I would check the codes and proceed from there.

Jul 13, 2009 | 1992 Ford Bronco

1 Answer

Runs fine when cold , when wamed up , spits and sputters, at low rpm. blows black smoke, wont ldle?


Sounds like an oxygen sensor problem. O2 sensors have to be warmed up to around 900 degrees to properly operate, so until they're up to temperature, the ECU ignores them and fuels the engine on preprogrammed fueling maps stored in the ECU. Once they're up to operating temperature, they provide feedback to the computer for properly fueling the engine. Blowing black smoke indicates a rich condition (excessive fuel), which usually is the result when and oxygen sensor is defective. The computer realizes the O2 sensor isn't working right and goes to a rich-fueling map for the engine. Rich running is not damaging, other than it can foul spark plugs and (if untreated for a long enough period) could clog the catalytic converter. This is better than a lean condition (too little fuel) which superheats the cylinders and causes them to detonate, which can fatally damage the engine. I would change out the primary oxygen sensors and see if your problems go away. You may need to get new spark plugs as well, especially if this has been going on for awhile - they may be carbon-covered and not firing efficiently.

Jul 27, 2008 | Lincoln Mark VII Cars & Trucks

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