Misfire

Speed27

Speed27

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Greenie N00B Member
Greenie Member
When I am accelerating from 2k-3k rpm it starts shooting flames with severe missfire i have full intake and straight pipe with catless downpipe with no tune has anyone experienced this and if so what was the issue
Year/Make/Model: 2007 Mazdaspeed 3
Mileage: 128000
Location: Kutaisi georgia
Concern: engine bogs/misfires from 2-3k rpm
DTC's: u0100-ff u0101-ff u0121-ff u0151-ff u2064-ff
Modifications: chinese aftermarket intake, straight pipe and carless downpipe
ECU/Tuning Software: stock
Tuner: OEM. Is the concern intermittent? No
Can you duplicate the concern? Yes
Recent Repairs: new coil pack oil change
Correction: nothing yet
 
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Stop driving your car before you blow the engine up.

You are REQUIRED to have a tune to run anything other than stock components. No way around it.

Also you need to put more information in the post. Copy this stuff and redo your first post so we can help you better.
https://mazdaspeeds.org/index.php?threads/troubleshooting-sheet.13117/

Year/Make/Model:
Mileage:
Location:
Concern:
DTC's:
Modifications
ECU/Tuning Software:
Tuner:
Is the concern intermittent?
Can you duplicate the concern?
Recent Repairs:
Correction:
 
Also I have an ob2 reader and in live data it shows absolute load value at 150% what can that mean ?
 
Ok first things first. You HAVE to have a tune with any aftermarket parts on this car if it can change the way the engine runs. A cold air intake has to be calibrated, a larger turbo needs to be calibrated. You need to buy an Accessport or Versatune and have the car tuned by a reputable shop or e tuner. I recommend Freektune as he tuned my car and it runs well without issues.

Second thing is for misfires you need to check your spark plugs and their gap. It wont make your misfire go away completely since you have already put aftermarket stuff on without a tune. You will probably still have issues but the plugs should be gaped to 0.026 - 0.027

You have a catless downpipe going into a straight pipe? What size piping? Why a straight pipe with no resonator? It probably sounds like ass. When I got my car the PO had done the same thing and it sounded like shit. I was not proud of driving the car until I got a decent 3" system made for the car.

Last thing is you NEED to have upgraded HPFP internals. The HPFP on these cars can be a weak spot and stock internals are known to not keep up with the required pressures needed for more power.

TLDL: Check your spark plugs and their gap, get a High Pressure Fuel Pump (HPFP) Internal Upgrade kit and a tune.
 
I have a accesport v2 but need to get a new cable I will definitely check spark plugs and I am not sure if the previous owner did a hpfp upgrade but I can send you what fuel pressure the fuel rail pressure sensor is reading if that will help to identify if my car has hpfp
 
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Speed27 said:
I have a accesport v2 but need to get a new cable I will definitely check spark plugs and I am not sure if the previous owner did a hpfp upgrade but I can send you what fuel pressure the fuel rail pressure sensor is reading if that will help to identify if my car has hpfp
Click to expand...

Did you not understand what I wrote in my previous posts? You have to get a tune. Go to https://www.freektune.com/products/mazdaspeed3-6-e-tune

Pay this man some money. Get your car tuned. This is important cause if your car is misfiring like that and you put an intake/downpipe on you run the risk of causing engine damage. I know I'm coming off like a jerk but before you do any more mods or anything it needs to be tuned. Check your plugs. If you have logs post those.

Also you need to remove the HPFP and actually inspect the internals to see if they have been upgraded.
 
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Are the tabs broken on your cable at the AP itself? check this video out so you can fix the cable for cheaper than buying a new one
Template public:_media_site_embed_youtube not found. Try rebuilding or reinstalling the s9e/MediaSites add-on.
 
L337TurboZ said:
Are the tabs broken on your cable at the AP itself? check this video out so you can fix the cable for cheaper than buying a new one
Template public:_media_site_embed_youtube not found. Try rebuilding or reinstalling the s9e/MediaSites add-on.
Click to expand...
This is accesport v3 connector i have v2
 
Fixed the problem it was a faulty fuel injector got it tested and injector was always open on cylinder 2
 
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