Stutter Issue; 2300 in 5th & 6th

Yeah, I just found the paperwork.

The dealership notes were:

"...Fuel pressure is stable after replacement of the high pressure fuel pump. Surging continues. After talking to tech line and more testing we came to the conclusion that there was a bad front fuel ratio sensor. Installed a new upstream fuel ratio sensor (H02S11). Test drive turned out to be good, no variation of throttle and no surging detectable."
 
Brought my MS6 in today with the service write up listed above, no questions asked they changed my sensor and I was good to go, hopefully no more stutters!!
 
any updates from those that have had the fuel ratio sensor changed?
 
MShreve said:
Yeah, I just found the paperwork.

The dealership notes were:

"...Fuel pressure is stable after replacement of the high pressure fuel pump. Surging continues. After talking to tech line and more testing we came to the conclusion that there was a bad front fuel ratio sensor. Installed a new upstream fuel ratio sensor (H02S11). Test drive turned out to be good, no variation of throttle and no surging detectable."
Click to expand...

Did Mazda complete any other work on your car that day?
 
I have similar problems and all the dealership could do was reflash my ECU. It helped but the car still stutters on moderate acceleration and I hear it knocking or pinging when it stutters.

I've also noticed in gear 3-6 if I give it 1/4 throttle the car accelerates great and quick, but under full throttle it picks up much much slower and seems to bog a little.

Any of you had that happen?
 
I've had that happen. As far as I know that issue is caused by a ping sensor that cuts the throttle input whenever a certain number of pings (pre-ignition) are detected. There is a reflash available to increase the number of pings before throttle cut.

Low octane fuel makes this worse. Unfortunately I'm one of the unlucky ones in that department. 92 octane is the highest available in Oregon.

I don't think this is related to what this thread is about, but I could be wrong.
 
MShreve said:
Yeah, that week anyway. They also took care of the clutch TSB and replaced both fuel pumps while troubleshooting the stutter problem. Why do you ask?
Click to expand...


so, do we believe that this sensor fixed the issue then? or was it one of the other TSBs? did you have those done first and still had the problem?

we are trying to figure out exactly which part fixed your problem, so it can be used to fix ours ;)
 
wannabe said:
so, do we believe that this sensor fixed the issue then? or was it one of the other TSBs? did you have those done first and still had the problem?

we are trying to figure out exactly which part fixed your problem, so it can be used to fix ours ;)
Click to expand...

I smell what you're cookin. :)

I was up to date on all TSB's (except the clutch) when this problem fist started happening.

Just to be clear, I was NOT experiencing the common bog/lag/throttle-cut issue under WOT in high gears, but had a low frequency stuttering/surging problem in lower RPMs in most gears (not WOT).
 
Guys, very interesting.

I have been searching around for this "stuttering" problem that i noticed after installing my Cobb SF intake. I remembered reading this post:

"Hey I am a tech for a Mazda Dealership so far I have pulled off two of these little short cold air intakes. They cause a turbulance in the intake and MAF can't read correctly it will run fine unless you are hard at it the car will jerk a bit and give you a radom cyl misfire."

What i experience is mostly in 5th or 6th when going WOT. It basically feels like i get BOOST, little boost, BOOST, little boost. And you can really hear the turbo spooling up and down with this new intake while simultaneously feeling the car "surge". I don't remember having this problem with the stock intake, but i've only had this car a couple weeks and have been in getting used to a substantially faster car.
 
liquidflem said:
Guys, very interesting.

I have been searching around for this "stuttering" problem that i noticed after installing my Cobb SF intake. I remembered reading this post:

"Hey I am a tech for a Mazda Dealership ...........
Click to expand...

When someone mentions they are a "tech" at a stealership, your first reaction should be to ignore and delete any information presented. You will be correct 99% of the time....

Ok, that said, there SHOULD be no problems associated with the Cobb SF intake, but your car may have some other issues that are aggravated when the OEM intake is removed. There are a few problems that can be attributed to the cold air intakes however. Is the car new or used?
 
liquidflem said:
Brand new. 1.5k Miles
Click to expand...


Hmmm... Ok, If it was good before and weird after, it is likely something in the install. Did you do it or someone else?

How fast are you going (engine revs) when you floor it in 5th or 6th? If the engine is loaded up with lots of boost at low revs, you will get some problems like this.... It is difficult to diagnose from afar, so one of your local smart guys should take a look. You can keep taking it back to the dealer of course, since it is a new car.
 
liquidflem,
Try putting your stocker back on. You may be driving your car a little more aggressively since you have a Cobb intake on. If the stutter goes away then put the Cobb intake back on and check to make sure that your installing the Maf correctly.
 
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