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I have a misfire on 6b and 7a on a Mercedes S500. I have replaced 4 plugs and 4 wires on those two cylinders with no change. Compression is good, injectors are firing and have not found any vaccum leaks. Any ideas?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2002 kia sedona codes reading misfire no6 cylinder

Sounds like the ignition wires,from the coilpack to the plug,or the coilpack itself

Posted on Apr 13, 2009

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SOURCE: 98 jeep wrangler 2.5L #4 misfire

check fuel for pressur and quantati to fuel rail posable fuel pump or regulator

Posted on Jun 09, 2009

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SOURCE: 2001 Galant ES-V6 DTC is P0304 - Cylinder #4 misfire

look for weak valve springs.

Posted on Jun 22, 2009

alicantecoli
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SOURCE: misfire on #6 and #8 cylinder 1996 Dodge Ram 1500

strip heads off again and remove the valves and check the seats ,regrind the valves and fit new springs and seals ,also check the cam lobes for deformation (wear)

Posted on Jun 22, 2009

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SOURCE: MISFIRING ON CYLINDER 1 VW POLO 1.4 3CYLINDER

I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.

Posted on Jul 23, 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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Miss fire


Hi Richard, I'm glad to help! Richard, there's a lot of things that can cause one certain cylinder to misfire. I would first: "Replace the Spark Plug and Spark Plug Wire for number 4 and see if the misfire goes away. If it doesn't then you need to do a "Compression Test" for cylinder # 4 and compare it to another cylinder and if its more then 25 Psi difference then you need to do a "Cylinder Leak Down Test" to see where you are loosing the compression. If the compression is good and you have new plug and wire and it still misfires. Then you'll need to check and make sure you have good spark coming from the coil. If you have good spark coming from the coil. Then you'll need to check and make sure the # 4 Injector is firing. Hope this helps and have an awesome day Richard.

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Cylinder #1 continues to Misfire


What DTC code(s) are you getting?
You performed a compression test on cylinder #1; did you test cylinder #2?
Compare the readings, if there is a significant difference in compression readings between the two, you may have a bad head gasket, a bad valve, etc.
The bottom line, the problem is internal to the engine.

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1999 mercury mystique cylinder 2 misfire ! Changed gasket, plugs, wires, and coil pack and problem still exist !!! Please help !!!


Okay kevin, the first thing is to make sure there is no vacuum leak, start the car and look and listen around for a hissing sound.if no leak is found then we will move on to the next test which would be a compression test, this test will tell you if the cylinder has compression and will help with the next step. seeing that you replaced the plugs wires and coil pack, if you have good compression then the injector would be the next step. check the connector on injector, if all looks good then the next step would be to swap injectors from that # 2 cylinder with #4 and then drive the car and if light comes back have it scanned and see if the misfire moved to cylinder #4. if it did move then you will be sure it is the injector. do compression test first , test all cylinders, make sure to have all plugs out and unplug coil pack connector when doing compression test. write me back with the results. good day

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How do i fix a misfire on a 1996 suburban


Hi Yvonne, I'm glad to help!

The first step when you have a misfire is to see what is causing the misfire. Technicians always rules out mechanical failures before moving on too Electrical issues. What you need to do is check compression on cylinder 2 and see if its good. Remove the spark plug and test it with a compression tester. It should read somewhere around 150 PSI or more. Check it to cylinder 4 and make sure the reading are close they must be within 25 %. If the compression is GOOD then you'll need to move to the electrical checks. Here's how you rule out parts. It doesn't matter if you have plug wires or coil-on-plug. SWAP the parts from cylinder 2 to cylinder 4 and start the engine and if the misfire moves from 2 to 4 then you know its either the spark plug the spark plug wire or the coil pack if you have a coil instead of a plug wire. If the misfire does not move and stays in cylinder 2 then it could be an INJECTOR, WIRING ISSUES, COMPUTER DRIVER. As you see Yvonne it can be a lot of things that can cause a misfire. Hope this helps and have an awesome day Yvonne.

Apr 11, 2012 | 1996 Chevrolet Tahoe

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I have a 1998 D1500 318 V-8 3.2L . The computer keeps tripping the check engine light and coding cylinder 4 misfire--yet the plug is good and the distributor cap is not purnt...computer problem??


Hi, there are 2 common reasons for a single cylinder misfire you have not addressed it: faulty fuel injector and burnt valve.
You need a voltmeter to test the injector:
Check the resistance across the injector terminals. It should be about 12 ohms. If open or shorted, replace the injector.
After removing an injector, apply 12 volts DC across the terminals. A "click" should be heard. If not, replace the injector.
If ok, then you need to do an engine compression leakdown test with cylinder compression gauge. if compression leaks down in that cylinder, then you have a burnt valve causing the misfire

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I have good plugs & wires,coils,new EGR.Still getting that code(P0304) do I need a new O2 sensor as well


P0304 is a #4 cylinder misfire. Swap the plug, coil and wire with a different cylinder to see if the code changes to that cylinder or stays with cylinder #4. If the code stays, the fuel injector will need to be replaced. If the code follows the components you changed then your problem is in the components and you can do further swaping of each indiviual component to determine the bad part.

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Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...


misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

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