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Piston 5 misfire - 2004 Pontiac Grand Prix

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Check your spark plugs. If that is fine it could be your coil pack.

Posted on Oct 03, 2010


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Where is the ignition module located on an BMW 325i 2001?

Failed ignition coils

The ones you replaced may not be the issue

Any coil can fail when it wants to

Have to look at cylinder misfire counts on scan tool,
use a scope,walk new coils,whatever it takes to find the
bad ones

Aug 20, 2014 | 2001 BMW 325i

1 Answer


A bad injector, piston ring blowby or a head gasket/coolant problem can also cause a cylinder to misfire.

Compare the color of that plug to one from another cylinder. If it is wet and gassy you have too much gas or not enough spark. If it is black and oily you have a piston ring problem. If it is sweet smelling, watery wet or white foamy you have a head or head gasket problem, if it is white then you have a too lean condition (plugged or faulty fuel injector).

Jan 01, 2011 | 1999 Chevrolet Blazer

1 Answer

I have a 2002 Malibu with a knok after its warm and oil light comes on and gos off also changed plugs cause of num, 5 misfire

it sounds like u have a piston problem on number 5 cylinder it would cause amissfire and a knock

Apr 16, 2010 | 2001 Chevrolet Malibu

1 Answer

Number 5 piston misfiring

It could be caused by a lot of different things, including a fuel injector, spark plug, spark plug wire, low compression, but in most cases it doesnt get to deep. I would start with checking the spark plug wire to cylinder number 5, then the spark plug. Moisture can cause a misfire so make sure the metal contact points are dry.

Jan 28, 2010 | 1999 Chevrolet Astro

1 Answer

Es, and we changed the timeing chain and belts ect. Now only piston 4 misfires at an idle, and we tested the coilover on piston four and its good. so the only thing i havent replaced is my upstream o2...

have you checked the injector a misfire can also be caused by a faulty injector try switching the number 4 coil with one of the others( if possible )if that cause the cyl that you switch with misfire youve found the problem if in do the same with the injecter but before all that check the compression it should be at least at 150 good luck.

Nov 12, 2009 | 2003 Acura RSX

2 Answers

Cylinder 5 misfire detected code l replaced coil pack,plugs.plugwires.and i still have the same problem

Run a compression test in all cylinders, if no 5 is down on comp you may have a broken piston ring or a dented valve.

Jul 16, 2009 | Ford E-150 Cars & Trucks

1 Answer

Misfire in #4 changed plug wires and both ignition coils still runs rough

It can still be fuel injectors dirty or partially plugged,and injectors also can deteriorate electrically,fuel supply,check with a gauge at the rail.Have also seen catalytic convertors stop up in the exhaust system,causing misifires and misfire codes,and also on a specific Mitsubishi truck,the powertrain control module,aka vehicle computer was bad,causing a misfire specifically on one cylinder.Then there are the mechanical causes that can be eliminated by performing a compression test for piston rings and valves,and a leakdown test that more specifically tests the intake and exhaust valve's sealing ability.Have also seen a bent rod on a running Ford engine cause a misfire,but that showed up on the compression test as that cylinder's compression was much lower than the other 5.

Aug 29, 2008 | Mitsubishi Galant Cars & Trucks

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