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Had a misfire replaced all 6 plugs and Cylinder 1/3/5 coils. Still misfire on cylinder 1 I checked all the connection and all seed good I can't figure this out and rilly need some help plz

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Misfires can be from plugs , HT leads ,coils. They can also be from low fuel pressure, dirty injector tips ,faulty injectors and injector wiring. Have a fuel pressure test done to determine the pressure and go from there.

Posted on Nov 12, 2014

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2 Answers

Po306code?


Misfire in cylinder #6. Could be bad spark plug, spark plug wire, cop coil, bad intake/exhaust valve, clogged fuel injector or piston/cylinder problem. What's the year, make, model, engine and have you been following the recommended maintenance schedule for new plugs?

Oct 12, 2017 | Cars & Trucks

1 Answer

2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


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DTC P0301 Cylinder 1 Misfire Detected


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DTC P0302 Cylinder 2 Misfire Detected


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DTC P0303 Cylinder 3 Misfire Detected


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DTC P0304 Cylinder 4 Misfire Detected


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DTC P0305 Cylinder 5 Misfire Detected


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DTC P0306 Cylinder 6 Misfire Detected


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DTC P0307 Cylinder 7 Misfire Detected


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DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

1 Answer

Ford freestar 2006, cylinder 6 code po301 cylinder 1 misfire


Standing on the passenger side.looking at the engine. Number 1 is the first cylinder on your left. Follow the wire to the coil. unplug it at the coil, lay the end of the plug close to the tip of the cap and start the engine. If there isn't multiple sparks, replace the coil. If there is , replace the plug and or wire. If you still have a misfire after that, do a compression test on number 1 cylinder.

Jul 07, 2015 | 2006 Ford Freestar

2 Answers

Why won't my car start?


P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Apr 25, 2015 | Cars & Trucks

2 Answers

P0302 cylinder 2 misfire detected


the problem is a sparkplug or wire you must be replaced

Apr 22, 2014 | 1999 Toyota 4Runner

1 Answer

Misfired cylinder 6, replaced coil, plug Misfired cylinder 5, replaced coil, plug Misfired unsure which yet, all of these happening within a week. It will run fine for a day or so after rep


change all plugs with proper ones - they are picky for some reason - do not change number or brand from original - coils were probably ok, - get some injector cleaner and run through it but check for exhaust leak at e g r tube - is a common over looked cause of misfire - a thing to keep in mind is misfire isn't always spark issue. hope I was of some help

Apr 20, 2014 | 2003 Lincoln Town Car

1 Answer

95 toyota t100 3.4L extended cab check engine light


Hello, this engine has 3 ignition coils on the passenger side cylinder head, each coil fires two spark plugs, the spark plugs on thew other side have plug wires connected to one of the coils on the other side, the #6 cylinder wire connects to the #3 coil, try replacing the spark plug wires

Jun 10, 2017 | 1995 Toyota T100 Xtracab

2 Answers

Code p0301 and p0316


P0301 - Cylinder 1 Misfire Detected
P0316* - Engine misfire detected on Startup (First 1000 Revolutions) Could be a Bad Coil or bad spark plug or a bad wire on cylinder one. Check the plug and the wire first then move to the coil. Good Luck.

Sep 23, 2010 | 2002 Ford Explorer Sport Trac

1 Answer

I got several error codes on my 07 Toyota Avalon, codes P0352,P0300 and P0301-P0306. Does any one one know what could be causing it or how to repair it.


p0352
Ignition coil B primary or secondary circuit malfunction
p0300
Random/multiple cylinder misfire detected
p03001
cylinder no.1 misfire detected
p0306
cylinder no.6 misfire detected
check you coils and spark plugs
make sure they are in good shape. check you spark plug wires also.

Aug 26, 2010 | 2007 Toyota Avalon

3 Answers

Misfire code#306


cylinder #6 is misfiring check plug(if gap incorrect can cause misfire, fouled etc) , coil on plug (or Wires) poss spark plug coil pack (check for cracks and heat damage in insulation of pack)

Oct 20, 2009 | 1996 Ford F150 Regular Cab

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