Question about 2001 Ford Windstar

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Missing in all speed ranges no spark at plug 3,, codes po171,174,

Po171,174,301,303,401 found no visible vac.leaks changed plugs 2 were fouled ..should I change coil pak???

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  • Marvin
    Marvin May 11, 2010

    sounds like u have engine problems. what is the cylinder compression? does the car smoke out the tail pipe?



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  • 3,267 Answers

Most advisable and hope u changed all the plugs too..........sodeep

Posted on Jun 18, 2009


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I have dodge stratus 2004 engine light keeps coming on I have change all spark plugs cables and ignition coil and it still says miss fire 2

Check that spark plug to make sure it isn't getting fouled inside the cylinder. Also, make sure the boot on the end of the ignition cable is intact and doesn't have any oil on it. You can check for a spark leak by driving into a dark area and, with the engine running, spray water on the spark plug cables. You'll see sparks if there are any spark leaks.

Mar 22, 2017 | Dodge Cars & Trucks

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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
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.
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 .

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:

Attach the J 26792 Spark Tester to engine ground.

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.

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.

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

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



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

3 Answers

#2 misfire fouled spark plug in sunfire

yes bad leads will be one of the faults
run the motor in the dark raise the bonnet look for sparkle trails
on the leads

coil pack could be faulty

compression test will tell if it is a leaky valve

back fire can be running lean or timing



Mar 31, 2017 | 1997 Pontiac Sunfire

1 Answer

Fouled plugs in #2 and #8 . Changed all plugs and still have a miss and the smell of raw fuel

ignition wires is agood start , check all wires for spark out put with spark tester saves a lot of time.

Oct 29, 2012 | 1997 Chevrolet Tahoe

1 Answer

Spark plug settings honda jazz 1.4 2006


Inspect the electrodes and ceramic insulator.

  • Burned or worn electrodes may be caused by:

    • Advanced ignition timing

    • Loose spark plug

    • Plug heat range too hot

    • Insufficient cooling

  • Fouled plug may be caused by:

    • Retarded ignition timing

    • Oil in combustion chamber

    • Incorrect spark plug gap

    • Plug heat range too cold

    • Excessive idling/low speed running

    • Clogged air cleaner element

    • Deteriorated ignition coils


Check the electrode gap (A). If the gap is over the standard, adjust the gap with suitable gapping tool.

Electrode Gap

Standard (New):

1.0-1.1 mm (0.039-0.043 in.)


Replace the plug at the specified interval, or if the center electrode is rounded (A). Use only the spark plugs as listed.

Spark Plugs





Apr 09, 2012 | Honda Jazz Cars & Trucks

2 Answers

Miss fire but no lights on changed the plugs and fuel filter also changed dist cap also checked for a good spark

A lean fuel mixture will not yield poor fuel economy but a misfiring cylinder will.You have already replaced the coils and the plug leads to the cylinders in question so they should not be an issue.Do the codes still indicate a misfire on cyls. 2 & 3? If so have you looked at the plugs? Has the oil leak around the plugs been stopped? Are they oil fouled? Could the pooling oil around the plugs be shorting the spark discharge to ground?or Valve Cover gasket is leaking. That's why you see some motor oil in the sparkplug sleeve (tube). removed the spark plug and My suggestion is to remove the sparkplug in cylinder 2 & 3 or whichever ones that the scanner indicated as "misfiring". Take a look at the sparkplugs and see if there's any oil around it. If you see any traces of oil, that means your gasket is worned out and need to replace.Good Luck in getting your problem fixed. If you need any further help - I'll try to help you the best of my knowledge and skills. You can repost on this

Oct 17, 2011 | 1996 Toyota RAV4

1 Answer

1999 Land Rover Discovery II engine miss

Observe the engine running in the dark to see if there are any spark jumps from the wires or coil, you may have a carbon track.....

Feb 16, 2010 | 2001 Land Rover Discovery Series II

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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.

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1988 GM 4.3 V6 Using about 3 quarts of oil in 75 miles.

the intake gasket is your proublem it is very comman it lets oil into the cylinders and it burns the oil witch fouls ur plugs

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