Engine is misfiring?

Good afternoon,

It sounds like a spark plug problem this guide can help us fix it.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

If the plugs are not gapped correctly, it will do this.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Was the oil cleaned out of the wells?

https://www.2carpros.com/articles/engine-surges

Please run down these guides and report back.

it turns out one of the spark plugs was cracked, thanks for the guides they helped me.

Nice work, we are here to help, please use 2CarPros anytime.

Roy

my car was put on the machine and advised that it has random multiple misfires. could you tell me the problem?

If it is misfiring, the machine that told you it was having issues should be able to tell you which systems are having a problem. Sounds like the MAF needs to be replaced

I replaced two ignition coils and all spark plugs and engine keeps sending misfire code.

Misfires can be a real problem to track down. They can be caused by ignition problems, fuel problems (dirty or failing injectors) intermittent wiring faults, bad crankshaft position sensors, rodent damage or mechanical problems like a sticking valve or low compression.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

As a quick rundown this guide will give you some tests to run to track it down.

i have a nissan altima 2006 2.5s with 115kmiles on it. car is slightly shaky in drive mode than in park mode...service engine light for the misfiring cylinder 3 is on...is there any correlation between these problems....what could cause these problem and what would be the approx repair cost for this problem?

thank you

yes, it is the issue.

miss fires come from bad plug/wire/coil. it could also be a vacuum leak, bad injector or wiring. compression is also a possibility

Roy

Hi, I would really appreciate any suggestions on what could be wrong with my car. So it all started couple weeks ago. Started my car to go to work, was fine, stopped at gas station to get gas. I was on E for a little while now. so I got some gas (not much I was already in a rush so figured I'll get more later) so I only got 1/4 tank of gas. As soon as I started the car at the gas station to leave, I noticed something was not right. Car was shaking hard and it smelled like smoke from inside. I was actually scared to drive to work wasn't sure if it was safe to drive. But I ended up driving it. it was down the street from gas station. A friend brought over seafoam and put it in the gas tank. He said I could have got bad gas or sucked something up from being on empty? (When I started it before he even put in seafoam, it was running fine now) this was fifteen minutes after parking at work. So anyway, he put in the seafoam and drove my car to gas station and filled up the tank to full. Drove around, said it's fine now. It was good for a couple days, then issue started happening again. car shaking when turn it on, sounds very rough like it's about to break down, sputtering sound , worse when I change gear to drive from park. Engine light blinking. No smell. So I took it to a mechanic to get checked out, but it wasn't acting up for them so they couldn't diagnose the issue. they said they drove it around couple times and it's running fine.no engine light on, no shaking, etc. Took the car home. Was fine again for a while. Then started happening again! Now more frequently but still only sometimes. Now I'm realizing it is usually like this: I start the car in morning, and it's running fine, then I drive for about ten to fifteen minutes . Car is off for either couple hours or few minutes, then go to start car and the issue comes up. So it seems like it's happening after the car is fully heated up and I start it. When I change gear to drive, the shaking and noise gets worse and engine light is blinking . Sometimes the issue goes away after I continue driving for about ten minutes. But now I am not driving my car anymore because I am scared I'll make it worse and I don't feel safe! Any idea what could be the issue? Thank you!

Hello,

It sounds like you have a blown head gasket. but to be sure lets run down this guide to confirm the issue.

https://www.2carpros.com/articles/head-gasket-blown-test

and

https://www.2carpros.com/articles/white-smoke-or-steam-coming-from-the-exhaust-pipe

Please run down these guides and report back.

Hi, I have the listed above model. When I start the car it cranks sometime during self start. The car pick up is really slow when accelerating. If I drive the car more than 100 kms/hr , the car misfires and jerks or say vibrates. Also, when I stop car it jerks and shakes too much until I make the gear on N. And again if I put the gear on D, it jerks and misfires and picks up real slow. Sometimes it just sops when I put the gear on D and starts after five minutes. I had changed coils and spark plugs and battery as well three months back.

Hi and thanks for using 2CarPros.com.

If the check engine light is on, have the computer scanned to determine diagnostic trouble codes. Here is a quick video showing how to use a scanner. If you do not have one, most parts stores will do it for free.

https://youtu.be/YV3TRZwer8k

Next, if the check engine light is not on (and based on the description it should be), I suggest checking for engine vacuum leaks, a plugged catalytic converter, and if the mileage listed is correct, check engine compression. Rings/valves may be worn causing low engine compression. Here are links that show how to do each of the aforementioned tests as well as symptoms:

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

I hope this helps. Let me know if there are trouble codes stored and what they are. It will help me to focus you in the right direction.

Take care,
Joe

2004 nissan altima 2.5L jerks with acceleration, then runs fine for a few seconds then jerks with acceleration....idles fine until you give it gas car will then rev up for a few seconds then idle fine then ev again, no check engine light. it all started when i stopped on the highway in traffic..went to give it gas and started jerking...any idea's?

This sounds like you have a coil or spark plug failing but to be sure here is a guide to help.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.

but wouldn't you get a code froma misfire?

Not always I have had plenty of times where there was never a codes set.

there are no plug wires there are only individual coil packs...the car idles perfect until you press the gas

There is still a short boot/spark plug wire that connects the plug to the coil they do go bad sometimes as well.Do a fuel pressure test a back pressure test on the exhaust wouldn't hurt ethier.

2003 Nissan Altima 4 cyl 127000 miles

The engine service light is flashing which indicates a misfire, I took the car and had it scanned and it scanned to confirm this. I have changed the plugs as the first step, I am starting to think that the ingintion pack or individual Direct Ignition systems are bad. Is there a way to test these packs to determine which one is bad?

An intermitant or "random" misfire condition is one of the hardest things to isolate without a performance testing unit. The only way a layman came really do it is by using the "shotgun approach" wich is change parts one at a time until you hit the problem, but this can get expensive. Most American and some import computers will isolate the problem down to a couple of cylinders which helps. I would take it in and have the engine load tested, and go from there. Hope this helps.

Engine Mechanical problem
2003 Nissan Altima 4 cyl Automatic 170000 miles

I have a cylinder misfiring and it is making my drives a real pain. I want to get it fixed, so what do i need to know so that I don't get ripped off by the mechanic?

The most likely cause is a bad coil. Is your check engine light on? If so, find out which cylinder is misfiring by having the codes scanned.

P0300 (multiple cylinder misfire)
P0301 (1st cylinder misfire)
P0302 (2nd cylinder misfire)
P0303 (3rd cylinder misfire)
P0304 (4th cylinder misfire)

You can verify that the coil is bad by disconnecting the electrical plug/connector that connects to the coil one by one. As soon as you start pulling the connector off the coil, the engine should start studdering. When you come across a the coil that makes no change to the engine when you disconnect it you've found your culprit. The coils will set you back about $70-90 each. I would advise changing the spark plugs out at the same time, just in case any of them were fouled out by the misfires. FYI, Nissan uses NGK PLFR5A-11 plugs. (The 11 at the end means that they're pre-gapped to the manufacturer's .043mm, so you won't need to regap them.)