Stutter Issue; 2300 in 5th & 6th

On my SPD6 I now have this happening also. My boost was staying fairly low at the first changes I had made, SRI, muffler delete, and Forge BOV. I keep track of it with a Dashawk and now after about 500 miles the boost is creeping up some in spikes. Used to be around 17-17.5 and now closer to 20. When the higher gears are used this over boost last longer than in the lower gears and I think it is triggering boost cutout. I don't know what to do to prevent this but may try the lightest spring in the Forge to help relieve the excess pressure.
 
Hey I'm Lucien and this is my first post, I'm experiencing the same stutter problem, I first nocited when my car was reflashed. It seemed the non brand gas made it worst. Since then I've been putting brand name gas (chevron, shell, etc..). When my car does it, it also pops black smoke. It happens sporadically and I haven't been able to figure out what the problem is. I took it again to the dealership and they reflashed the car again but didn't fix it.

Any leads?

Thanks.
 
I have this same stutter and I'm relatively stock. Its been more pronounced the last few months. I figured it was me getting used to a turbocar and the lag more severe however I can also do it at will its almost frustrating "rolling" onto the throttle in a high gear.

I remember buying the car thinking wow you can really step on it in 6th and the car goes now it "hiccups" There's another thread on hear subject line "hiccuped this morning" or something like that.

Wannabe... do the service depts correct/check these items on their own? I've been complaining about a rough idle which seems to be getting worse which correlates to the power hesitation getting worse. I'll have to ask about this.
 
Zimmer said:
I have this same stutter and I'm relatively stock. Its been more pronounced the last few months. I figured it was me getting used to a turbocar and the lag more severe however I can also do it at will its almost frustrating "rolling" onto the throttle in a high gear.

I remember buying the car thinking wow you can really step on it in 6th and the car goes now it "hiccups" There's another thread on hear subject line "hiccuped this morning" or something like that.

Wannabe... do the service depts correct/check these items on their own? I've been complaining about a rough idle which seems to be getting worse which correlates to the power hesitation getting worse. I'll have to ask about this.
Click to expand...

it doesn't hurt to bring the TSB with you. i had spoken to my service dept a while back on it, and mentioned the rough idle etc, and they "couldn't replicate" i gave them the TSB and they flashed it without question. it seemed to help, but i think i need the new fuel pump...i'm just too lazy to make another appt...
 
thanks. I'll bring it wasn't sure if I could. scheduled maintenance in about 500 miles so that'll be next week I hope. I'll check my VIN too to see if I fall in. new pump would be nice.

I'm not sure what goes on in the service dept. Not knockin them but a similar example I have a problem starting the car almost every other time. It stutters trying to start. and they tell me they can't replicate that so that one boggles me.
 
Thank you Wanabe, this is great information and I will definetly take this TSB with me when I take it in for maintenance.
 
I finally solved the stuttering problem on my car which has plagued me since I bought it. A friend of mine owns a performance shop and he told me that the gap of .051 with the stock plugs is excessive. He told me to regap them to between .028 and .030 for a starting point. THE STUTTERING IS GONE! I installed cobb ap and reflashed a new map and I'm in love with my car again.
I hope this works for you guys. Good Luck!
 
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wow. Did you get new plugs like one-step colder? I was going to get some new plugs! This is a great find! I'm giong to try it out. I think the aftermarkets are gapped at ~.032?

Were they the original plugs? Was there any carbon build up/ sludge that could cause a crappy spark?

Just wondering if it was the cobb AP that fixed it or dirty plugs...
 
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Yeah nice discovery! I might have to try this.

As far as 1 step colder plugs, is it bad to go 1 step colder with only a CAI?
 
I just reached 30,000 on the odometer and I decided to change my plugs. I replaced them with OEM, but I did not check the gap before installing them. The car seemed to have more pep and I was content with the tune up. The car would still stutter with quick shifts and wot, but overall it was acceptable. I then installed the cobb ap. I have a cpe downpipe and fujita cai. So I installed the map that used the fujita cai. The car felt like it had lost a few hundred pounds and it pulled hard. The stuttering however got exponentially worse. I could take off well if I pushed the accelerator like there was an egg under my foot, but any time I tried to get on it, the stuttering returned. I then uninstalled the AP and it drove acceptably. Then I removed the new stock plugs and there was carbon all around the ceramic and around the electrode like it was fouling. I checked the gap on the 1st plug and it was .061! I will always check the gap on plugs from now on. I regapped all of them to .028 and went for a test drive. The car drove beautifully, and I could not get it to stutter. I reinstalled the AP with the new map and ........ WOO HOO!!! Very smooth, much better boost pull, hard to drive slow with reservation. The car begs you to go faster. I will give the car more testing tomorrow, but at this point I'm a very happy camper.
 
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wow man this is great info. The carbon build up was something I was wondering because I had mine cleaned and the car ran great and the stuttering has been progressively coming back. Keep us posted on the plugs with the smaller gap.
 
the stock gap on these cars is .028-.030. so its a no wonder you were stuttering so badly without gapping them. should have gone 1 step colder with some denso's
 
I appreciate the advice bova80. In fact the Densos were on order before I discovered the gapping problem. I went to autozone and they told me that the stock gap was .051. They even wrote it on the box. I'm wondering if the computers have the wrong plug in the system. I did see him look under mazdaspeed 6, but they originally gave me a short plug and I brought back the original to get the right ones. BTW has anyone been having idling problems with the Densos?
 
Hey guys, first post here.

Doesn't happen often, and my 2007 MS6 doesn't blow smoke or anything, but it does stutter pretty badly in 5th grear, and sometimes very lightly in 3rd.

So, do we recommend having the TSB fixed AND replacing the spark plugs?
 
Did you get this problem figured out?

Not sure if anybody mentioned this yet (I only skimmed the thread), but I just went through a similar issue with stuttering. My MS6 had just about the same symptoms as yours...stuttered hard while accelerating or decelerating in the lower RPM's. My car sat at the dealership for a week while they tried to figure it out (apparently they weren't getting any diagnostics info). After replacing both fuel pumps they finally found that a sensor (don't remember the name) between the low pressure and high pressure fuel pumps had gone bad. Once they replaced it the stutter dissapeared.

Hope that helps.
 
BTW, the stutter that I experienced was a slow stutter (low frequency). It almost felt like the DSC was wigging out and pulsing a brake.
 
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