Question about 2002 Hyundai Santa Fe

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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 or vice versa

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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.

Posted on Jun 05, 2010

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Check head gasket, running acompression test will show if it is blown

Posted on Oct 07, 2011


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I guess its not so much a back fire but bad misfire. will not go up a hill keeps lurching ahead under the misfire...

Often it takes a load to bring out the misfire like hard acceleration or climbing a hill, did you check the spark plug boots on the coils for signs of burning or other damage of any kind.

Dec 29, 2016 | BMW Cars & Trucks

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Engine died while driving, no spark, replaced coil, now starts, idles, runs well at low rpm, but misfires when accelerating. No check engine costs thrown. What should I check next.

Change your ignition module. The distributor is a weak point of the Honda, I will always change out the whole thing than just try the coil.

Jun 05, 2015 | 1996 Honda Civic

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1989 Honda Accord started misfiring on number 4 cyl. I was tuning it up at the time.

No, if the advance was not working, the main symptom would be very poor acceleration. All cylinders would be affected, not just one.

Pull the spark plug on #4 and check its condition, it may be defective. Check the gap and if wrong, like too wide or narrow, gap it to correct specification. Is it oil fouled so spark is hindered? A good plug in a healthy cylinder will be gray or light brown with very little deposits on it. See how that plug compares with the others.
If the plugs look good, check the plug wire for #4-if it is cracked or old looking, try another plug wire to see if the wire was the problem.
If still not found, you may want to have the compression in #4 checked. See if it matches (close) to the other cylinders. Low compression can cause a misfire.

Use the timing light to check the advance, see if it is working right. At idle you will have your base timing, like say at 8 degrees BTDC, At 2500-3000 RPM, the advance should be between 20-30 degrees Before.
If the plugs are too new to read them, you still may have a defective plug, or the wire was not snapped down good at the plug. Also check the distributor cap for any defect (carbon tracks indicate shorting of the spark). Check for corrosion where the plug wire snaps into the distributor cap.

Aug 26, 2014 | Cars & Trucks

1 Answer

Chevy beretta

I guess I'll start by saying a 22 yr old car could be reaching the end of its life, so I would keep the RPM under 3000 to help keep it on the road a little longer.
You did not say the plug wires have been replaced, and they could also cause the miss. Also, one of the coils or plugs could be faulty even if they have been replaced.
The check engine light is not on, right ?

Jan 19, 2014 | Cars & Trucks

1 Answer

03 Monte Carlo no power

You have a vacum leak. It is going to be ya intake manifold. Best way to check it is to use some starting fluid and start the car and spray a very little around the intake. If the motors rpm goes up you know you have a bad intake gasket. If it doesnt then look for a vacum leak in the rear of your motor. There is about 4 vacum hoses there and one could be dryed out from the fire.

Nov 25, 2012 | Cars & Trucks

1 Answer

I am working on a 1998 honda accord ex 4 cylinder. it keeps throwing a miss fire code for all cylinders when you get on it at about 60 mph and won't accelerate past this until you let off and hit

Hi there:
First I suggest scanned the ECU. The misfire counter function can help you determine which cylinder is behaving badly. Clearly this is not an option for all people and vehicles though.
NOTE: Even without engine scanners you can identify which cylinder is causing a dead misfire. Carefully disconnect one spark plug at a time. If the cylinder you are disconnecting is operating properly you will hear a change in RPM. If the cylinder you disabled is the bad cylinder you will see no change in engine behavior.

Check your ignition system. There are several steps to this.
- Remove spark plugs and check to see if the electrodes look worn down or contaminated. Check your spark plug gap with a plug gapper to see if the electrode has worn down.
- Use a multimeter to check your spark plug wire resistance. They should read roughly between 2,000 - 12,000 Ohms. What you are really looking for is an open circuit in one of the wires. Bend the wires around and see if you lose continuity.
- Check cap and Rotor. Look for carbon tracking or extremely worn down rotor.
- On newer vehicles with distributeless ignition systems coils are prone to failure. If you know which cylinder is misfiring try swapping that cylinder's ignition coil with another cylinder and see if the misfire moves with it.

If you know your ignition system is operating properly you may want to check compression. You may already have the spark plugs out from your ignition check so it only takes a minute to check engine compression.

Fuel injection Service - The motorvac service works miracles. It is available at most repair facillities. Adding a can of fuel injector cleaner to your fuel tank is not ecnough to clean out a severely plugged injector. The motorvac solvent is much more potent and should only be used with a fuel injection cleaning machine. It is a good place to check with a hard to find misfire.

Vacuum leaks - A vacuum leak will cause a misfire. If the leak is near a certain cylinder that cylinder will misfire. You can try to find a leak by spraying down the engine carefully with carb cleaner. If you spray the location of the leak the RPMs will rise. You can also inject the intake manifold with smoke from a smoke machine and look to see if it leaks out anywhere it is not supposed to.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 17, 2012 | 1998 Honda Accord

1 Answer

WHICH IS MY # 4 PISTON ON MY 06 F150 TRITON 5.4? Also my motor clicks when I get past 3000 RPM's and I lose power. Any help please???

The # 4 piston is on the passenger side last one to the firewall. Your getting a misfire past 3000 RPM and the engine is detecting the knock and is powering down so you wont hurt the engine any more then it is. If there is an Auto Zone around your area, have them scan the truck for any DTC codes free of charge. This should help us address the issues so we can get your F150 running 100% again soon. Good luck and keep me posted. 

Sep 02, 2009 | 2006 Ford F-150

2 Answers

Doesn't want to accelerate

check spark plugs wires!!

Jan 21, 2009 | 1996 Buick Skylark

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