How I fixed Mazda 3 rough idle / missfire 

Trying to help my brother out with his mazda 2008 3, was it because you had bad plugs? When turning car on it jumps up to 2000 rpms & stays there until a couple seconds as the car cools down.

@@daniellucatero-jimenez.1440 no I have no idea what that is if it idles at 1,500 or so I would say it’s a bad idle air control valve but if it jumps to 2000 off the start that sounds like something isn’t pulling enough air into the engine right away meaning it’s delayed and that can either be a blown circuit a grounded wire or just a bad mechanical part I would try to start the engine with the hood open and listen for any areas that don’t sound normal in terms of air being pulled into the engine that would probably give you a better idea of where the problem is and then you can go off that

@@daniellucatero-jimenez.1440 jumping rpm is related to too much air actually try checking the throttle body and the idle air control valve both of those can get all kinds of grease in them and cause them not to flow properly

@@parkerlong808 you think I’d have to check a fuse for this 🤔 Id assume I have a vacuum leak going on somewhere within my car maybe it’s intake or could it be the PCV valve? I’ll definitely check that tomorrow I once ran my own car with a PCV but not one of the hoses it connected to & it gave me a high idle than normal.

@@parkerlong808 I’ll check out the throttle body tomorrow do you know where the Idle air control valve is at on the Mazda 3?

bill blyth where’d you learn to do this?

@@onixtheone is it true?

@@rayneedaebluz that resets the ECU (computer). It basically makes the computer go back to mile number one. Think of it this way: as you drive your car, the ECU learns a few things. For example, it learns driving habits- when you speed up, when you slow down, highway and surface street driving etc. it also learns when to adjust things like air/fuel ratios and timing advances and retarding. After tens of thousands of miles, the ecu adjusts for components that start to wear as well. Things such as O2 sensors, MAF sensors, etc. When you reset the ECU (BTW every car is different when resetting), you refresh the ECU back to factory settings. If your car has an issue, resetting is ONLY a temporary fix. Look up "how to reset my ECU on my (enter your make, model and year" and you'll find how to reset it specifically for your vehicle. Good Luck!

@@e.g.5806 w

OMG! The sh*t did work when I read it i though this has to be a joke you just save me a lot of money thanks.

Youbaraj Sharma the Mazda mounts are total shit

If I go to a Mazda dealer will they change these out for better ones?

How can you tell if the coils are going out? Mines throwing a p0101 a month after a new MAF. did EGR a year ago. Neither fixed stalling and rough idle. Ideas? Would Love to eliminate the engine rattle too lol

Why???

@@luisperez3187 Brake cleaner will eat seal's and makes the plastic parts very brittle.

yup theres specific maf sensor cleaning😊

What if you don’t know who the mafs censor is?

@@o0kilabot0o the same goes with carburetor cleaner too it does the same as brake cleaner that's why some mechanics mentioned to remove gaskets before cleaning with them cleaners that I have found out I found that out the hard way Lol 😂

Rebel Scum That rough idle can be solved by disconnecting the negative battery terminal and pressing brake pedal for 30 second! Reconnect battery and start the car and let it idle run for 30 then turn on Air conditioner then let it idle for another 10 min! Then drive it as you would normally for 20 min on highway and local street! The "shift shock" from 1st to 2nd gear still has me baffled!

Here in australia mazda offer a tcm update to get rid of that clunky 1st to 2nd gear change it has something to do with the plates in the gearbox

Oh ya your engine light blinks. Very serious issue . i had it on my mazda p5 and i changed spark plug wires and coil boots . its usually coils or plugs

You can usually hear a misfire.Its not hard.If its surging listen carefully and if you hear it chopping you likely have a misfire.

@@TesNRad did it last? How was the car

@@KollynJ 2 years later I still have the same car, She runs great. Coils are still the same since I changed them before my original comment .

@@TesNRad how far did you drive with misfire? Wondering how far you can go before it’s detrimental as a guy is selling one w a p0300

tune what up

@@soundsandambientvideos380 UMMM THE LAWNMOWER ??? SMFH HOW ABOUT MAYBE THE ENGINE SEEN THROUGHOUT THE ENTIRE VIDEO LMAO

Tune up the piano he means. You need to turn up your piano and that might help

No he didn’t

Oh yes, a great way to mess up things. Depending the make and model of your car, you always want to disconnect the battery first before working under the hood.

...useless cryptic RU-vid comments....

he used brake cleaner. thats is not recommended. what you need is Throttle cleaner. its 10 bucks

Carlos Araujo this is happening to me on a mazda 6 2003 three care to share how to go about it.

nunca use eso pa limpiar el maf sensor

purge control valve

I had same problem,mine was from alternator.Check that first.

It is normal for the engine rpm to go up when you turn on the AC. It takes HP to run the AC, because of the compressor. If you do not notice any idling or performance issues, I feel there may be no issue. I hope that helps.

Normal it happens with all cars not a problem at all

I hand A/C and engine code problems although I didn’t know the A/C was involved changed lots of things that didn’t work but changed the 02 sensor and fixed it

It's absolutely normal in japanese cars. In this form, the engine never stalls with AC on.

You have to let run 20 minutes, turn AC on and run another 20 minutes to reset/relearn after battery has been disconnected or runs like crap. 😬

Its the 2.3L the 2.0L have the dipstick in the middle.

@@romandunka6235 And the cosmetic cover is smaller.

I have the same engine. That's the 2.3

Looks just like my sister's.Hers is a 2.0 I'll look Monday and see for myself.

smoke test engine & never fill gas tank to top

bikego alex I found a vacuum leak on my 07 Mazda 3. It’s right on the Intake manifold itself I’ll try to link a video that helped me. I know the years are off but it could be very similar or practically identical. Anyways what the guy shows fixed my problem after struggling forever to figure it out. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YvEih6yhqfM.html

that would be a stretched timing chain my friend.

Ya where is the rest of the intake... that is only part of the K&N cold air intake... and he doesn't have the bracket on....

I guess

Same I need a new one. I heard it was a recall. Im going to look my vin up and see. Im planning to do all of them with high quality mounts.

Thats the first thing I always do with a suspected misfire and I inspect the wires and coils.Ive literally seen walmart destroy my aunts coil pack in her 2001 beetle by spraying cold water on a hot part! Thank god they didnt crack the block that day!

землянин точно

@Benjamin's Universe misfires on specific cylinders has to do with either coil packs, fuel injectors, spark plugs, or spark wires going to the coil pack on that cylinder. Check these first. Absolute worst case scenario is loss of compression on cylinder 4, however that isn't the cause 99% of the time so don't freak out unless none of the above had fixed it previously

While it is cold!!!! I have seen people dump cold water on a block and destroy their engine.......Dont do it.