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Random misfires on start up

Just replaced all plugs and all new coil pack and cleaned the fuel injectors

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  • 61 Answers

If there is a distributor try to clean may be the corrosion of the distributor, or try to replace new high tension wire.

Posted on Oct 28, 2012

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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chuck943
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SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

ButtFuzz
  • 463 Answers

SOURCE: my 2000 v8 toyota tundra suddenly lost power

Does this motor have the equivalent of crank-trigger ignition? If so, is the sensor A-OK?

Posted on Mar 02, 2009

  • 5 Answers

SOURCE: 2003 Chevy Venture misfiring

The injector is a good possibility, although you should check for spark in the wire first, as the electrical is the weakest link in the system. Put a spare plug in the end of the wire with the plug resting on metal, then have someone crank the van to see if you have spark that far, test and replace spark plug, (do not get shocked!) then look into a new injector or a good cleaning.

Posted on Jul 17, 2009

  • 15 Answers

SOURCE: Hesitation and stumbling.

Before you do that, check which thermostat it has in it, if it has one that is letting it get too warm or not completely up to temp when the computer think it should be, it would cause this. My 2000 crown vic did the same thing and thats what it was.

Posted on Jul 20, 2009

roniecon
  • 6826 Answers

SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

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1 Answer

Hyundai accent1.5rsi misfiring


misfires are also from bad injectors , injector harness problems and low fuel pressure
when a misfire is there at start nut clears it is an indication that the injectors need cleaning/ replacing

Feb 26, 2016 | Hyundai Motor 1998 Accent

4 Answers

I have a 1996 chevy Corsica with a code PO300.I have tried many repairs and still cannot repair this code


code p0300 refers to random/multiple cylinder/s ---misfire detected=== causes spark plug/s--HT lead/s--injector/s---ignition coil/s--low compression --wiring
Seeing as you have covered all the electrics, now concentrate on the injectors and fuel pressures
If you will do all injectors and the fuel pressure is where it is supposed to be ( pressure test) then you will have covered all bases
Low compression will be in the one cylinder only ans will remain in that cylinder regardless of injector or plug changes
I would leave that to the last resort as if it is random, it may be a loose valve seat insert that moves randomly causing a compression problem

May 24, 2015 | 1996 Chevrolet Corsica

1 Answer

Mis fire code po300 po68


300 is random misfire and 306 is cylinder #6, I would check the coil pack on #6. If it has separate coils per cyliner, swap the coil, see if the misfire goes to that cylinder. If it does replace the coil.
If it has three coil packs you can still swap the coils. If that doesn't fix your problem, then you will have to check the injector with an ohm meter. resistance between the prongs should be between 11 to 15 ohms. check another injector and they should be relatively close. Let me know
Good luck

Oct 21, 2012 | 2004 Saturn VUE

2 Answers

Heavy idle, random misfire code 04 trailblazer


I would start with the inlet manifold gasket, these are know to break down causing vacuum leaks which can cause this issue, also check around engine for other vacuum leaks

Mar 08, 2012 | Chevrolet Cars & Trucks

1 Answer

Giving a 300 and a 301 code where do i start sounds fine when started and then when you put in gear it start misfiring


P0300 - Random / Multiple Cylinder Misfire Detected

Possible Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plugs
- Replaced Injectors
- Replaced Ignition Coils

P0301- Cylinder Number 1 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.

Jan 14, 2011 | 2002 Toyota Tacoma

4 Answers

2004 Acura MDX 3.5 130,000 miles multiple missfire how do i fix ?


Hi, multiple cylinder misfire, is when the engine cylinders do not fire in the correct order, and do not do it constantly. There is no particular pattern to it. My experience with this condition is that it is usually caused by a faulty ignition coil that is beginning to burn out. It could also be bad wires pluds rotor or cap

Causes Include.
  • 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

Possible Solution:
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. 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.

Jan 11, 2011 | 2004 Acura MDX

1 Answer

2004 Saturn, "L" series, 3 liter V-6. po300,


300 is random misfire and 306 is cylinder #6, I would check the coil pack on #6. If it has separate coils per cyliner, swap the coil, see if the misfire goes to that cylinder. If it does replace the coil.
If it has three coil packs you can still swap the coils. If that doesn't fix your problem, then you will have to check the injector with an ohm meter. resistance between the prongs should be between 11 to 15 ohms. check another injector and they should be relatively close. Let me know
Good luck
Randy

Nov 09, 2010 | 2004 Saturn L-Series

2 Answers

Hello I have a1997 xk8 runs great but my check eng. light came on and the code that it read was a misfire code were do I start troubleshooting.


If it was a specific misfire code go to that cylinder and check the following: plug, wire, and coil, if it is a random misfire code, start by checking your spark plugs(including the gap), plug wires, and coil packs.

Sep 24, 2010 | 1997 Jaguar XK8

1 Answer

Code p306 misfire on injector 6


Random misfires are usually caused by a leaking vaccum pipe, and will only be apparent at idle and sometimes at low engine speeds under part throttle.
Isolated misfires are usually caused by a faulty injector, coil pack, ignition lead, or low compression.

Well, you're going to have to check the spark plug,  spark plug wire, the coil pack, low compression, and the ignition lead, which only really leaves the injector, or even an intake leak at the offending cylinder. 

Start the engine and then spray intake spray or the like around the intake at the offending cylinder and see if the engine note changes. If it does, then you have an intake leak, otherwise, they need to check the injector in the offending cylinder. 

Good luck and hope this helps. It might just be time for a tune up: new spark plugs and wire or some fuel injector cleaner every fill up for now.

May 05, 2009 | 1998 Oldsmobile Eighty Eight

1 Answer

Random engine misfiring- fault code P0300- 1999 cutlass


Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

Dec 15, 2008 | 1999 Chevrolet Cavalier

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