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Engine misfire whats the cause - 1997 Mercury Mystique

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In most cases it is a spark plug wire or spark plug. But in higher milage cars it can end up being a cracked exhaust valve or broken compression ring. You need to identified which cylinder it is and test for spark, compression and if that is inconclusive check the fuel injector for fuel delivery. If this is beyond your comfort level a shop can do this for 1 hours diagnosis

Posted on Feb 06, 2017

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Oil on plug in cylinder 6 ,can that causes misfire?


IF you have a misfire you need to get a scan tool on the car to see what fault codes are being generated and what irregularities with the engine operation show up.
An oily spark plug won't be the cause of a misfire. If the plug is very heavily oiled up it may not generate a spark and you will run on one less cylinder. If you are down a cylinder on a 6 cyl engine you would definitely feel it but all the other cylinders would fire normally unless you had a misfire issue with the engine.

Jan 28, 2016 | Chrysler Pacifica Cars & Trucks

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Engine miss when cold, engine light on, new gas, air filter. fuel pump in tank. hot engine loght goes on off, when off at stop stalls out engine light off.


Diagnose Engine Misfire - Auto Diagnosis Repair Help

www.aa1car.com/library/misfire.htm
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Dec 16, 2015 | Cars & Trucks

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What is order of troubleshoot for cylinder misfire P305?


Possible causes
- Faulty spark plug 5
- Clogged or faulty fuel injector 5
- Faulty ignition coil 5
- Fuel injector 5 harness is open or shorted
- Fuel injector 5 circuit poor electrical connection
- Ignition coil 5 harness is open or shorted
- Ignition coil 5 circuit poor electrical connection
- Insufficient cylinder 5 compression
- Incorrect fuel pressure
- Intake air leak
What does this mean? What does this mean?
Tech notes
The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes"
What does this mean? What does this mean?
When is the code detected?
Engine Cylinder 5 is Misfiring.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation
P0305 Jaguar Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

Read more:
P0305 Jaguar Cylinder 5 Misfire Detected

May 06, 2015 | 2007 Jaguar X-Type 3.0 Sedan

1 Answer

Rav 4 misses under acceleration


well if engine is ok. No year, no engine stated, wow. !!!
misfire is bad combustion. (gas usa cars are my answers)
  1. never did a TUNEUP this decade? 60,000 miles tunes.?
  2. bad spark first.
  3. bad fueling next too rich causes misfire. lean bogs.
  4. misfire shakes engine hard, is it .
  5. does it misfire parked just racing engine?
  6. cause are many over 50, but if engine good way less, so what can it be (we do tests no Gue$$) bad spark plugs, leaking injectors execessive fuel pressure, bad TPS, sensor. map sensor issues, (even clogged) and others. no engine stated makes waxing smart, hard, way to hard so i quit here.

Feb 14, 2015 | Toyota RAV4 Cars & Trucks

1 Answer

2003 grand marquis with misfire code p0316


The first problem you have is assuming that the ignition coil is the only thing that can cause a misfire.

Diagnostic Test Code (DTC) P0316 is a "continuous memory only" code that indicates that there is a fault causing a misfire during the first 1000 revolutions of the crankshaft immediately after engine start-up. This should be accompanied by the regular cylinder misfire monitors (Codes P0301 through P0310) unless the misfire does not continue long enough for the regular misfire monitors to determine which cylinder is misfiring.

In order to determine what is actually causing the problem, you must have access to a scan tool that can perform Key On Engine Off (KOEO) fault testing and Key On Engine Running (KOER) fault testing as well as interfacing with the onboard engine computer to read live data and perform system tests.

Please note that generic OBD code readers DO NOT have the capabilities to do what you need to diagnose this problem. You will most likely get additional DTCs that can help lead you to find the source of the problem when KOEO and KOER tests are run. Generic OBD code readers can access only continuous memory DTCs.

Possibilities/conditions/systems that can cause this code are:
>Camshaft Position Sensor
>Low fuel: less than 1/8 tank
>Stuck open EGR Valve
>Blocked EGR passages
>Ignition system
>Fuel Injectors
>Fuel injector control circuits
>Running out of fuel
>EVAP canister purge valve
>Fuel Pressure
>Evaporative emissions system
>Base engine (mechanical) problems

Mar 05, 2012 | 2003 Mercury Grand Marquis

1 Answer

I have the code po300 multiple misfire ,the engine will have no power when first started and start driving until check engine light goes solid.I have changed the crank shaft sensor,camshaft sensor,it has...


what type/size of engine? what year model truck? several things to check for a random misfire. also , how many miles on the truck? coils are a possibility but they usually set specific cylinder misfires if it is equipped with coil on plug ignition system. a vacuum leak or low fuel pressure can cause a random misfire. also broken valve spring can cause the misfire because it effects the engine vacuum.

Aug 17, 2011 | Dodge Charger Cars & Trucks

2 Answers

2002 ford escape 3.0L DTC P0305and P0306 what would you ck


P0305 - Cylinder 5 Misfire Detected
P0306 - Cylinder 6 Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, The Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
- Engine hesitation

Possible Causes:
- Improper spark plug at cylinder #5 and #6
- Insufficient compression at cylinder #5 and #6
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #5 and #6
- Fuel injector #5 and #6 may be faulty
- Intake air leak at cyli

Possible Solution:
- Perform Injector Service
- Replaced Spark Plug #5 and #6
- Replaced Injector #5 and #6
- Replaced Ignition Coil #5 and #6

Hope helps.

Jan 02, 2011 | Ford Escape Cars & Trucks

1 Answer

ENGINE MISFIRES WHEN SERVICE LIGHT FLASHES


Hi:
engine misfires are one of the few engine codes that will flash the engine service light. Usually misfires are caused by a failing ignition module, but you can have your vehicle's codes scanned for free at an auto parts store to find out what caused the code. If multiple misfires on all cylinders are detected, it pretty much eliminates a single bad spark plug or wire, but something that effects the entire ignition system, such as a module or pick up. Hope you figure this out!

Apr 22, 2010 | 1998 Ford Windstar

2 Answers

I have a Mazda 2001 MPV, just had service for o2 sensor and now the check engine light is blinking .


blinking light means engine is misfiring. continuing to drive will severely damage the engine. The O2 should not be related to your engine misfiring

Nov 13, 2009 | 2001 Mazda MPV

1 Answer

What is error code po 304 and po316


P0304 is Cylinder 4-misfire detected-probable cause is as follows. Engine mechanical fault, wiring, ignition/fuel system, injector, ECT/MAF sensor, ECM

P0316 Misfire detected during startup-first 1000 revolutions- probable cause is as follows-Engine mechanical fault, wiring, ignition/fuel system, injector

Aug 18, 2009 | 2003 Mercury Sable

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