Question about 2004 Mercury Mountaineer

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No compression in cylinder number 3

Took it to a shop and had a machine hooked up it read that there was misfires in cylinder 1, 3 and 5. Then done a compression test on cylinders 1 and 3. There was no compression in 3. The guy at the shop said it was to big of a job for him. What should I chek first?

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Broken or worn compression rings and faulty valves are normally the cause of low compression. I would suggest you take the vehicle to a larger reputable company for a second opinion to start with.

Posted on May 05, 2013

Testimonial: "I've also been told it could be a leak in the vacuum hose or timing gear and chain! I'm trying to check everything that is easy to get to before getting into the motor! "

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1 Answer

What causes misfires?


If the misfire is on one a particular cylinder or perhaps 2, these issues need to be addressed and checked...
1. Power to the spark plug.
2. Coils and spark plug condition.
3. Fuel supply to the cylinder
4. Air supply to the cylinder
5. Correct fuel/ air mixture to the cylinder
6. Cylinder compression. Low compression or a cylinder compression level below spec will result in a misfire. If the compression tester shows low compression in a cylinder the causes of the poor compression reading then need to be addressed.

The fault codes generated by the computer and read by an appropriate scanner will tell you which cylinder or cylinders are misfiring.

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Misfire on Cylinder 3 swapped plugs between 3 and 4 on Pontiak Aztek 2003. Misfire remained on cylinder 3. Swapped ignition coil 3 and 6 with ignition coil 1 and 4 misfire still on cylinder 3


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2002 toyota tacoma reading code 300 random misfires, took it to a mechanic he says cylinder #1 is low on compression and i need a new motor


Well, I would probably get a second opinion next.
A random miss code is just that, the computer is seeing a loss of power on different cylinders at random times. If cylinder number one had a dead miss you should get a code 301.
It could be something mechanical such as a burnt valve or bad rings, but that is usually on one cylinder.
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Number 3 and 4 are not firing from coil on 2002 subaru outback 2.5


its faulty coil.

Get the compression test done on each coil.these will let you know if its faulty coil or not.

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It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Ford Explorer 5.0L: Engine Miss?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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2004 Ford F150: Engine Misfire and Lean Code?

http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html

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1995 Toyota LS: Misfire at idle or low RPM

http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Toyota Corolla: Random Misfire?

http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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2006 Ford Freestar: Misfire on Cylinder Number 2?

http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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This will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

After putting gas in my car, why did it start shaking really bad and idling real high?


After a fill up, the fumes in the gas tank are very concentrated. If problem with evap system, it could cause problems after a fill-up. Just a thought.

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1 Answer

My 2005 Chevy Equinox LT has a number 1 cylinder misfire. I already had the spark plugs and wires changed. I also had the coil changed and it still misfires. I checked it with my OB2 computer, and it reads...


Have you done a compression check? I had the same problem on an S-10 Chevy pick up. Found that # 3 cylinder had low compression due to a burnt exhaust valve. No more problems after having valve job done on the engine.

Feb 16, 2011 | 2005 Chevrolet Equinox

1 Answer

I have a '03 Toyota Celica GT-S with a annoying mis-fire. Started small by replacing all spark plugs - nothing. Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked...


Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?

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I have a 2001 chevy cavalier z-24 2.4L twin cam.....their was a misfire reading in cylinder #3. The first shop I took it to replaced the spark plugs,,ignition cover, and ignition coil cover. It ran fine...


If you are getting a misfire from cylinder #3 your check engine light should come on and read this code: P0303 which is Cylinder 3 Misfire Detected. Below I have listed what causes this and a few solutions that may help you out.

Causes:
- Improper spark plug at cylinder #3
- Insufficient compression at cylinder #3
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #3
- Fuel injector #3 may be faulty

Solutions:
- Perform Injector Service
- Replace Spark Plug #3
- Replace Injector #3
- Replace Ignition Coil #3

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My engine light came on. I went to Autozone to get a reading. It read PO301 3rd cynlinder misfire. So I put new plugs and wires. The engine light never went off. I re check the plugs and wires. But I kept...


Low compression can be caused by different things. And NO YOU DON'T need a new engine yet. You need to take the car to a repair shop that you trust and have them do more tests. A bad Valve will cause low compression and thats a lot cheaper than a whole new engine. A bad head gasket can cause low compression and that's cheaper than a new engine. You need to have the repair shop do what's called a "leak down" test. This is where the cylinders are pressurized one at a time and if they are losing pressure, the mechanic can pretty much tell you the problem. For example if air is coming out the exhaust, then the exhaust valve has failed, and if air is coming out of the intake, the the intake valve has failed. If it bubbles out of the radiator then the head gasket has most likely failed. Take it in and let me know..

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1 Answer

99 buick Lesabre


hey thanks for bringing me up to speed. ive been working on many other problems but with your great explanation i remember.
we need to check the compression on that cyl. and compare it to the compression on 2 other cylinders your choice.
but before you do this get a can of carb cleaner . and with the car idling spray around the intake manifold in the area of #6 cyl. what we are looking for is a small vacuum leak that would also act like this. with the engine idling and spraying around the intake the engines idle sould not change and if it does when you spray you have an intake leaking.
let me know how it turns out.
later
paul

Sep 22, 2008 | 1999 Buick LeSabre

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