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Misfire on cylinder 4&6

Replaced all spark plugs and #4 coil pack stil lhas misfire on cylinder 4&6

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 69 Answers

SOURCE: P0304=misfire in cylinder 4. coil?

not coil coil it wouldnt fire at all it is either a plug or a wire replace the wire and plugs and that will fix it

Posted on Oct 06, 2008

  • 1 Answer

SOURCE: cylinder 5 misfire

you need to replace all 8 coil packs.

Posted on Aug 03, 2009

  • 82 Answers

SOURCE: ford e 150 4.2 Misfire cylinder 6

do a compression test, you may have a bend valve , I'm assuming its not getting overheating so I don't think its the head gasket..a compression test can give you the answer..hope this was very helpful...thanks

Posted on Aug 08, 2009

  • 534 Answers

SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.

Posted on Aug 18, 2009

  • 1 Answer

SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

did you check the injector pulse on that cylinder and it also could be the pcm , i had a taurus and a sable with good coils stop firing 2 cylinders and it was the pcm ,the code it gave was secondary coil but changed the pcm and it worked fine

Posted on Aug 29, 2009

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2003 sorento 3.5 cranks won't start code 300 302 304 306


The code 300 is a Random/Multiple Cylinder Misfire....a 302 is Cylinder # 2 misfire detected. ..and the same for 304 and 306..being 304 is cylinder 4 misfire and 306 is cylinder 6 misfire...All these at the same time normally is a faulty coil pack..,and or faulty coils...spark plugs.,plug wires.....It should be running horribly or barely ....However it could be internal losing compression.....It could just need a good tune up.....Disconnect battery before changing coils,wires..,or plugs in order to clear the fault codes.....

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Can catalytic converter on 98 Pontiac grand prix cause misfire on cylinders in car


No, a plugged converter would cause the engine not to breathe properly. Too much back pressure would stall the engine or make it run very poorly. It would not be local to any one cylinder-all of them would be affected.

To diagnose a misfire in one cylinder, well, you start at that cylinder. It could be ignition related- the spark plug and spark plug wire for #6, possibly the ignition coil for #6 in the coil pack for the engine. (A v-6 would have 3 coils in the coil pack, one coil for 2 cylinders.) It could also be fuel related, so the fuel injector for cylinder 6 should be considered. And the last reason for a misfire is usually the most expensive repair: low compression in #6. This may be a head gasket problem, or a piston ring problem, or one of the valves for #6 may not be sealing well, causing low compression and the resultant misfire. The engine computer codes a misfire when it senses low power output from that particular cylinder. The misfire causes a lag in crankshaft rotation, and the crankshaft position sensor senses it.

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DOES THIS VEHICLE USE COIL PACKS? MOST LIKELY (3.)....1 THAT FEEDS CYLINDERS 1&5 ....1 FOR 2&3 AND 1 FOR 4 AND 6......OR SOMETHING SIMILAR TO THAT. CHECK FOR A BAD COIL THAT FEEDS 4 & 6 TRACE PLUG WIRES TO INSURE THAT SAID COIL FEEDS #'S 4 & 6

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On most Honda's when you get a misfire happening across the whole engine like that there are a few likely issues. the ignition coil if it's a single coil style or the connector at the distributor. They also have some issues with EGR's and plugged ports which can mess with the fuel trim numbers. It's important to check the fuel pressure and if possible a timing offset spec from the scanner whenever you're dealing with misfires on any vehicles Honda or not and determine correct pressure and flow whenever possible.


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Misfire code#306


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