Stuttering Issues when Accelerating
 

I have a 2012 Speed 3 with 17,500 miles on it and no CEL on. Only mods are ram intake and front engine mount. When accelerating in 2nd and 3rd gears I have been having issues with the car stuttering. If feels as though I am feathering the gas pedal in the 2,000 - 3,500 RPM range. Since I cannot have the car looked at until 7/6 I was hoping someone here would have helpful advice.

Has anyone here experienced a similar problem? While searching around I have seen issues with Speed 3's stuttering up in higher RPMs and under boost, but this is not the case with mine.

(Possibly related) When starting my engine since the car was brand new, it always sounds like it is struggling to start.

I can't help much (free bump), but I would:

Try different PREMIUM gas from a better provider
Check plug gaps
What intake? Check air straightener is in correctly
ECU may not like intake on OEM tune
You have a REAR Motor Mount

Post up a more complete list of mods please. Brand names might be helpful.

Do you have an Access Port?

Thanks, rear motor mount, I haven't been on the forums here in quite a while. I doubt it is the gas I am using, I will check the MAF sensor and possibly put my stock air box back on.

My only REAL mod is a Corksport ram intake. I do not have an access port.

I am no expert on MAF calibrations, but you should look into that.

Can you switch back to the stock air intake and verify the issue persists?

http://www.mazdaspeedforums.org/foru...el-cut-146714/

Sounds exactly like my symptoms.

But I think my problem fixed itself. I used different gas and it went from Happening 1-2 times a day to 1-2 times a week. And now it hasn't happened for several days. *fingers crossed*

You have one of the following

- A leak on your intake or around the maf sensor
- Need to gap spark plugs to 0.0026
- Severe knock
- A drop in fuel pressure.

If all you have is an sri I would look at the first two options first.

SRI? Check to see if the air straightener didn't come lose. Just pull the filter and chech to see if the plastic insert is still in place.

Sent from fastest ko4 Pu!

This looks to be the problem. I took off the filter and the air straightener was loose and could easily be pulled out.

Is there anything wrong with just super gluing the air straightener onto the aluminum MAF housing piece? Or should I go through the trouble of getting a new piece through the Corksport 2 year warranty (my SRI is less than a year old)?

I have a stutter with my set up too that I never had with my 07. I'll have to check the straightener on my intake. Good info thanks guys

Applying 4 dots of sillycone where the straightener fits in to the housing. Done.

Sent from fastest ko4 Pu!

The air straightener on your cp-e intake can't be loose. The maf housing and straightener are cnc'd from a solid block of aluminium. Corksport is the only manufacturer that's uses a plastic air straightener that falls out after the intake expands and contracts a bunch of times in the hot engine bay.

Yes but I can check the other connections anyway. There has to be a reason for it.

Maybe because you vent to atmosphere?

Thanks for the help everyone, especially to kritz for the diagnosis.

On a side note: All of the spark gap tools that I am seeing online don't even start till a .02 measurement.

No sir. It's a 50/50 but I have the plate installed and it's set to recirc. I ran the same one on my Gen1 and it was prefect.

AH, I missed that completely when I looked back through the thread. You were first on the scene and had it right, thanks to you too.

So my car has stuttered a couple times since I thought it stopped. I checked the plugs because of a tip someone else gave. And they looked fine, but I did gap them at .028 originally and not .026. Should I just go ahead and re gap? And what do you think the best/easiest method to finding a leak is? I just don't understand how everything was fine for so long and my stutter came out of no where.

I did try the 50/50 setting on my cobb bpv for about a week like 3 months ago. But I switched back and have only had stuttering issues in the past month or so.

It could be KR, as you described above changing gas stations made it happen less often, I would find a station that carries E85, put a gallon in your tank, fill it with gas, then drive around and see if it happens again.


If it doesn't, it was KR.

When it started I was on my 25% e85 tune. And it actually happened a little less when I went to my 93 tune. I don't think it's related though.

I did several logs and never saw any KR. I did 3rd and 4th gear pulls and fuel pressure was great with no KR. Like the thread starter, the stutter only happens in lower rpms when I'm just cruising.

Not to bring this thread back from the dead but i am having the same issue however, only 19,000 miles, STOCK. No mods at all. It happens every once in a while when gently accelerating. I put Quick Trip gas in it and have tried Chevron/Shell a few times too. I read somewhere else that our car has a torque limiter when the steering isn't straight? I noticed it more when turning slightly, not sure if this makes a difference or not! Thanks guys!!!