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Random multi miss fire, I have replaced MAF sensor, can shaft sensor, plugs, wires, fuel filter, I checked coils, I checked fuel presser; reset computer, cel keeps comming on for random multi miss fire, and idles good, but as soon as you accelerate it miss fire's, what am I missing?

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  • Cars & Trucks Master
  • 21,873 Answers

Some general thoughts - -
when you try to accelerate, a couple of things happen. The engine shifts sometimes, and you put it under a load unlike when it is idling.
Is it possible a wiring harness or a hose is moving when you accelerate ? Is it possible the fuel pressure or ignition module is not good enough to handle the engine under load ? Is the EGR opening early or something causing a vac leak and a lean fuel mixture ?

Posted on Jul 23, 2013

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Posted on Jan 02, 2017

  • 1632 Answers

SOURCE: multiple random miss fire

Now change the distributor. Get one from salvage or e-bay. Did the timing belt jumped a tooth or is it new. Vitally

Posted on May 12, 2009

  • 8 Answers

SOURCE: coil pack keeps going bad,

Your problem sounds like an intermittent short in the power feed to the coil pack from the EEC module

Posted on Nov 03, 2008

txkjun
  • 409 Answers

SOURCE: Honda Misses.

Pin point the dead hole and check that injector.

Posted on Dec 24, 2008

cognac222
  • 4 Answers

SOURCE: 89 Corsica: no power, hesitates in drive, idles

Check your fuel pressure, and or injectors. You may have too much fuel getting into the engine causing it to burn rich and overheat the converters.

Posted on Apr 26, 2009

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2 Answers

What else could this code mean code p0300 random misfire


A miss-fire could be ignition problems that are easily missed.
There is a sensor in the crank shaft that starts the ignition process. So the sensor could be bad or the other part of it called the reluctor ring (depending on the year, make and model.) Then you have the wires from it to the ECM and it could be wires, The ECM then sends the signal to the coil packs to fire, the coil packs then generate the high voltage that goes to the spark plugs.
Besides the Ignition system you could have a problem with the fuel system. If the fuel system has an injector problem then it is not sending the right fuel amount at the right time and it could cause the mis-fire.

Aug 18, 2014 | Cars & Trucks

2 Answers

Why the loss of power and po300 code?


HARD TO SAY WITH OUT BEING THERE BUT THIS MIGHT HELP .
Crankshaft sensor Was the trouble with my 99 Chevy truck after replacing many components like coil cap rotor wires and so on .
http://www.obd-codes.com/p0102 Code P0300 Causes and Fixes Code p0300 is a code that is generated when your engine has a misfire that is not related to only one cylinder. Sometimes this code will be set in addition to other codes such as p0301 which means that there is a misfire on cylinder 1 (cylinder 1 is the number one cylinder when looking at the firing order. It is generally the forward most cylinder on the engine.). If these engine codes are present as well the you should diagnose those first as they are probably causing code p0300.
This code will set your check engine light and needs to be fixed as soon as possible. If it is not then you will probably need to replace your catalytic converter as well as the problem that is causing your misfire.
There are many causes for this obd code. Since it is a "random misfire" or "multiple misfire" this means that the misfire is on different cylinders and not just one all the time.
Common Causes
  • Low Fuel Pressure
  • Vacuum Leak
  • EGR system malfunction
  • Internal Engine Problems (such as low compression)
Less Common Causes
  • Faulty Coil
  • Faulty Spark Plugs and/or Wires
  • Camshaft or Crankshaft sensors
  • Ignition module
  • Computer

Jun 12, 2014 | 1998 Chevrolet Tahoe

2 Answers

Kia rio 2003 errorcodes 1166,102,1505 1507,300 found on the scan what is the reason


Hi there:P1166 - HO2S11 Heater Circuit Fault (Bank 1 Sensor 1)


P0102 - Mass Air Flow (MAF) Circuit Low Input

A code P0102 may mean that one or more of the following has happened:

  • The MAF may be disconnected, or a wiring connection may be bad
  • The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF).
  • The MAF sensor may be faulty
  • The vehicle computer may be faulty (very rare)

Possible Solutions

The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:

  • Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
  • Inspect for any air leaks near the MAF sensor.
  • Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
  • Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
  • Replace the MAF sensor.




P1505 - Idle Air Control System At Adaptive Clip


P1507 - Idle Air Control Underspeed Error



P0300 - Random/Multiple Cylinder Misfire Detected
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.


A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable).
Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.



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Aug 20, 2012 | 2003 Kia Rio

1 Answer

Multiple ramdom miss fire


RANDOM MISFIRE CAN BE CAUSED BY FAULTY SPARK PLUGS AND WIRES.CLOGGED FUEL INJECTORS AND FUEL FILTER.MAF SENSOR CONTAMINATED CAUSE LEAN FUEL CONDITIONS.

Nov 20, 2010 | 2006 Chrysler Pacifica

1 Answer

1999 Lincoln continential will not start


I would first,change the spark plugs only if they were in the motor,say three years and 50,000. Not just to fix a misfire
Second you can only change a COP Coil, if you have a code or a way of knowing which one is bad. Again,why would you change all of them, when they all now work?
Crank Sensors rarely fail,so what test did you do to determine that was necessary?
Also.how would you know ,you had a missing coil, if you had no crank signal?
Now lets go from where you are now
Did you check fuel pressure,key-on ,eng off,with a pressure gauge?
Fuel filter fairly new?
Do you have all the ducting from the air cleaner to throttle body on and no vacuum leaks?
Do you have the MAF sensor connected. No signal,no start!!

Let me know what help you need

May 08, 2010 | 1999 Lincoln Continental

2 Answers

Check engine codes 97 ford exp v8 codes:0358 0171 0174


P0171 and 174 System Too Lean
Basically this means that an oxygen sensor in banks 1 and 2 detected a lean condition (too much oxygen in the exhaust).

These codes may mean that one or more of the following has happened:
•The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
•There could be a vacuum leak downstream of the MAF sensor.

•In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling.
•Inspect all vacuum and PCV hoses, replace if necessary
•Check for a dirty fuel filter and proper fuel pressure

P0358 Ignition Coil H Primary/Secondary Circuit Malfunction
Code P0358 is for cylinder #8.

Inspect the spark plug, coil, and coil boot on that cylinder for signs of damage. Replace as needed.

If no problems are found with the components, check the wiring harness from the coil to the Powertrain Control Module (PCM).

Potential Causes: Failed coil or boot
Failed spark plug
Harness problem

Feb 09, 2010 | 1997 Ford Expedition

3 Answers

Check engine light


A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Jul 02, 2009 | 2004 Dodge Ram 1500

3 Answers

2003 Ford Crown Vic Misfire


usaly plugs & wires but I would get that coil tested before I do wire and spark plugs! if coil is good wire and plugs! hi milage???

Jan 08, 2009 | 2007 Ford Crown Victoria LX Sedan

1 Answer

Honda Misses.


Pin point the dead hole and check that injector.

Dec 23, 2008 | 1995 Honda Accord

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