misfire

Hello all, I’m running into a huge problem on my speed 3. I’m having a cylinder 1 and 4 constant misfire. It will randomly stop and run fine then go back to misfiring. Recently it has not stopped misfiring. What I have done: Spark plugs replaced and gapped MAF replaced Set of fresh injectors...

Hello all, I’m running into a huge problem on my speed 3. I’m having a cylinder 1 and 4 constant misfire. It will randomly stop and run fine then go back to misfiring. Recently it has not stopped misfiring. What I have done: Spark plugs replaced and gapped MAF replaced Set of fresh injectors...

2008 speed 3. Bnr s3, jbr 3.5" intake, hks bov, front mount intercooler, auto tech hpfp internals, ngk 3787 plugs, brand new itfp. Hpfp pressure dropping at wot only 1 cell. Being tuned by Justin at freektune he suggested new plugs. Didn't help. I replaced itfp and filter, didn't help. Hpfp has...

Year/Make/Model: 2011/Mazda/Mazdaspeed3 Mileage: 105k Location: Washington, US Concern: Rough cold start and P0300 DTC's: (please include descriptions): P0300 Modifications: Stock ECU/Tuning Software: None Tuner: None Is the concern intermittent? No Can you duplicate the concern? Yes...

Year/Make/Model: 2007 Mazdaspeed 6 (imported from U.S. -09) Mileage: 103,000mi Location: Finland, Northern europe Concern: Cylinder 2 misfire. Rough idle, but doesn't seem to misfire every cycle. Normal idle RPM. Very rough stuttering under acceleration, and blinking engine light (P0302). Engine...

About 2 weeks ago I bought a 2008 Mazda speed 3 with 184xxxkms. Test drove it and all went well. On the drive home the bov came out of the hose, tightened back up and it has been misfiring in hard boost ever sense. The car has mishimotto front mount Cts4 turbo Hpfp internals Exhaust 3.5 intake...

Hey guys! So ive been dealing with this misfire for a while now and cant seem to find whats causing it. Symptoms are lots of backfiring and hesitation under load about all rpms after 2000. We've checked coil packs, spark plugs, compression (which is good), mass airflow sensor, and swapped the...

Hey guys, I am new here, so I apologize if I'm not doing this right... So, a while ago, I was driving around and punched the throttle, car overboosted to 30psi and hit fuel cut, tried slowly easing into boost and heard the EWG open a little bit, but not nearly as much as normal, the next pull...

Ok so first off will start by saying I am far from an expert but also not a complete noob so like to tell people I know just enough to know I don't know enough lol Ok so couple weeks back while driving and the engine light comes on and can feel a pronounced miss. Using Torque app see it is...

Hey guys, so I've been having some issues with my speed 3 lately and I'm struggling with figuring out what it is. So the car runs smooth at idle and during regular driving but as soon as I hit peak boost it breaks up really hard i also had a cylinder 4 misfire code pop for only a small period of...

ENGINE/DRIVABILITY Year/Make/Model: 2013 mazdaspeed 3 Mileage: 141000km Location: montreal, QC Concern: No power, enters limp mode(flashing CEL) when trying to accelerate into boost DTC's: p0401(egr is deleted), p0300, p0442 Modifications stock sized intake(sure and cobb), autotech hpfp...

My MS6 has developed a misfire on cylinder three and threw both p0300 and p0303 codes. The spark plugs are all good and gapped within factory spec, I tried checking the coil packs. But after clearing the code to see if the cylinder switched along with the coil pack, the check engine light has...

Just bought my first speed about two weeks ago so Im sorry if I come off noobish in this post Year/Make/Model: 2008 Mazdaspeed 3 Mileage: 123000 Location/Alitutude: Meridian, ID (2,605' sea level) Concern: Misfire on cyl 3. Weird idle during startup. Overheats and burning electrical smell (might...

Howdy Today I got my 2006 MS6 from the shop as I left it for a lookup and cause in 4th and 5th gear mostly, on high boost, ie under high load, would start lurching. Initially I thought it might be something to do with the awd, but thats all good, and it is the same regardless DSC on/off. So...

I had a random misfire on stock hpfp internals, so I figured I needed better fuel flow, upgraded that everything is fine with it, still having the high RPM random misfire and it only misfires when Im done accelerating(slowing down) , Im going to change the spark plugs and clean the vaccum lines...

Okay, I have done a lot of research and posted on multiple forums but I am stuck. Preface: 2007 Stock Mazdaspeed3 with short ram intake. Bought at 108,000 miles from the original owner, currently has 120,000 on the clock. The Head gasket blew and burnt a valve at 112,000 miles. Replaced the...

For the longest now ive been having a cylinder 4 misfire that will come and go out of random. Ive gone through and replaced a ton of hardware( spark plugs/coil packs/wiring harness/fuel injectors and seals/ fuel rail and injector harness/) only time I've noticed a difference of the problem...

Hello all! I've had my speed3 for some time now but I'm new to this forum specifically because I could use some outside advice. My car has developed a cylinder 3 misfire (p0303) while under boost around 3.5k-4k. The car runs perfectly fine under normal driving circumstances and the idle is...

Hey guys - just created an account on here, but I was a member on the mazdaspeedforums for quite some time. I'm trying to see if anyone would have any advice on how to best approach the P0204 injector circuit malfunction and P0304 misfire. The two CELs only come up during cold starts...

Hey there, I’m having a problem with my 2008 Speed 3. When I’m travelling along the highway with cruise control on and I go on a slight incline, the engine begins to burble/misfire after that slight load is introduced. It doesn’t seem to do it under full boost conditions. Only just at low rpms...