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2007 hummer h3 #4 cylinder mis fire causes - Hummer Cars & Trucks

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Ignition (no spark ) , Fuel (faulty injector) ? Video's on youtube Misfire P0304

Posted on Dec 27, 2016

Testimonial: "I have spark it starts and idols ok then it seems to kick out and the check engine light blinks"

  • Jeff Armer Dec 27, 2016

    Does your hummer have a coil for each cylinder ? coil on plug or near plug ? Change the coil for that cylinder with another and see if the problem follows . The check engine light flashing means there is a Catalytic converter damaging misfire happening . For starts switch # 4 coil with another cylinder .

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Mis fire on cyclinder one and overheating for an 2005 Chevrolet equinox


You are describing the classic symptoms of a blown head gasket from the cylinder into the water jacket. This causes loss of compression in the affected cylinder and also injects hot gases into the cooling jacket resulting in overpressure and overheating of the coolant. Perform a compression check of all cylinders and if any are appreciably lower than the others, you are looking at some major engine work.

Aug 02, 2014 | 2006 Chevrolet Equinox

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Fireing order


four cylinder 2.9 litre 1-3-4-2
five cylinder 3.7 litre 1-3-5-4-2

Number one cylinder being at the harmonic balancer end, 5/4 being at the flywheel end.

Jan 23, 2011 | 2007 Hummer H3X

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At idle the engine misses, off idle very smooth and runs normally computer code multi cylinder misfire. have changed plugs and wires did not help. could it be the coil packs of a fuel problem?


This sounds as if you have a vacuum leak, check all the lines and check the intake. There are a lot of things that will cause mis fire. mis fire code is triggered when the ecm reads a very slight difference in the time the crank sensor picks up a signal. Mis fires can be from electrical, vacuum, mechanical, and eletronic sources. If you can get it to a person/shop that read which cylinder are misfiring this helps alot, narrows the field. Let me know I can help. Also it helps to know what engine we are dealing with

Nov 11, 2010 | 1998 Oldsmobile Aurora

1 Answer

Cylinder mis fireing


2001 Ford Expedition 4.6 liter V-8 VIN "W"

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2001 Ford Expedition 5.4 liter SOHC V-8 VIN "L"

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Hope this help (remember comment and rated this).

Jul 30, 2010 | 2001 Ford Expedition

1 Answer

Dodge obd code p0305


The DTC (Data Trouble Code) P0305 is the generic OBD-II DTC for "Cylinder 5 Mis-fire Detected", and it means that the OBD-II control unit has detected a problem with the #5 cylinder.

The problem could be a faulty spark plug, or a spark plug wire for the #5 cylinder, or the coil for that cylinder could be faulty (2.7 liter), or the distributor or distributor cap could be faulty (3.0 liter), or the fuel injector for the #5 cylinder could be faulty.

Before you look for any electrical problems causing the mis-fire on the #5 cylinder, first do a compression check to be certain that the mis-fire is not caused by a mechanical problem.

Here are the firing order diagrams for the 2.7 and the 3.0 liter enginesto help assist you.


2.7 liter

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3.0 liter

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Jul 03, 2010 | 2002 Dodge Stratus

1 Answer

Check Engine Light on Yr2001 Ford Escape V-6 2wd. Code says: Misfire on cylinder #5. Dealer said compression is low in cylinder #5. This Escape needs to pass smog. What can we do?


If the engine has a P0305 DTC (Data Trouble Code) for a "cylinder 5 mis-fire detected", then the first thing to do is to do a compression test to determine if the mis-fire is actually being caused by a mechanical problem, or an electronic problem.

If the engine really does have low compression on the #5 cylinder then that is caused by a mechanical mis-fire and nothing electronic will repair it, and the most common causes for a mechanical mis-fire would be a burnt or bent intake or exhaust valve, a warped cylinder head or damaged head gasket, or a damaged piston. You can call around and find a repair shop that will do a "compression leak down test" if you want to know exactly what is causing the compression leak without any dis-assembly to the engine.

May 25, 2010 | 2004 Ford Freestar

2 Answers

I keep getting a misfire in cyclinder 4? the car also now will not accelerate past 3000 rpm's i pulled the plugs and only 4 looks like its not firing i replaced it last week... there is no oil in the water...


The very first thing that you should do next is to take a compression reading especially the #4 cylinder, to determine if the mis-fire is caused by a mechanical problem or an electrical problem. If you are looking for an electrical problem when the problem is actually a mechanical one, you could wind up wasting a lot of money and time.

A mechanical problem that would cause a low compression mis-fire in the engine could be a burnt or bent intake or exhaust valve, a worn out or broken piston or compression ring, or even a warped cylinder head.

An electrical mis-fire would most likely be caused by a faulty ignition coil, a worn out or cracked distributor cap, worn out ignition wires, worn out spark plugs, or a faulty fuel injector.

Jun 05, 2010 | 2002 Hyundai Santa Fe

1 Answer

Reads codes of po300,po302,po303,po305


Hi these are mis-fire codes ,
P0300 is a general mis-fire detected code the others relate to specific cylinders,
P0302 is cylinder 2 misfire
P0303................3........
p0305..................5........
I would check your spark plugs first if Ok you need to make sure the coils are working ok for this you need an osciloscope to check output voltage if your not sure then take to a qualified mechanic with Cadilac experience it could be caused by an air leak,bad ECT sensor or even Mass air flow sensor ,codes only tell you the result not the cause

Jul 24, 2009 | 2003 Cadillac CTS

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