2007 mazdaspeed 3 hesitation issues.

[Fobio]

5.41 and 10.87. Basically I lift off throttle when I experience it.

At the instances you've refered to, at the throttle position you were at, you are running really lean...into the 12's and 13's. As you have indicated, this is not from the relative leaner AFR's commanded at boost onset, since you're well into 14 - 15psi. Without physically inspecting, it's hard to say what is mechanically wrong with it. Assuming not leaks, which is usually the culprit to a whole range of MS3 issues, it's possible that something is amiss or damaged with the MAF. Also possible to have a post-MAF leak...Your fuel trims seems ok, so it's likely not a tuning issue.

Have you unplugged your battery after the MAF cleaning?

[branavank]

Thanks for you help. The mechanic who cleaned my maf said he did a ecu reset, might do another just to be sure. I also had the air filter on the CAI replaced recently. Just maintenance thing. I wonder if they messed it up some how.

At the instances you've refered to, at the throttle position you were at, you are running really lean...into the 12's and 13's. As you have indicated, this is not from the relative leaner AFR's commanded at boost onset, since you're well into 14 - 15psi. Without physically inspecting, it's hard to say what is mechanically wrong with it. Assuming not leaks, which is usually the culprit to a whole range of MS3 issues, it's possible that something is amiss or damaged with the MAF. Also possible to have a post-MAF leak...Your fuel trims seems ok, so it's likely not a tuning issue.

Have you unplugged your battery after the MAF cleaning?

[breakfasteatre]

Thanks for you help. The mechanic who cleaned my maf said he did a ecu reset, might do another just to be sure. I also had the air filter on the CAI replaced recently. Just maintenance thing. I wonder if they messed it up some how.

do the ecu reset anyway, i wouldnt trust anything a mechanic has said

[branavank]

Ok I did an ecu reset. No change in hesitation.

I did flash stage 0 on for now and I have a appointment with Jim on Tuesday.
I am thinking I should look into changing the the maf and fuel pump anyway. Are there an aftermarket options that is cheaper or better?

[branavank]

Just an update guys. Installed a new MAF and the issues has pretty much disappeared. Car is idling and running really smoothly now, I might start push it past half throttle now

Just want to thank every one for the help and feeback.

[dreadlock]

Just an update guys. Installed a new MAF and the issues has pretty much disappeared. Car is idling and running really smoothly now, I might start push it past half throttle now

Just want to thank every one for the help and feeback.

How much did the new MAF cost you? You did it with Jimmy?

[branavank]

Maf was 400 bucks. i didn't do it with jimmy. Car is running well now. Thanks for all the response.

After all this work, money and effort spent to fix it i am going to post it for sale now. We just upgraded to a new car.
OH well. Wife wants something bigger and newer.

[SomeGuy]

$400!?!?!

They're $140ish from Rock Auto for the Denso which is OE anyway.

[branavank]

Fark!!!!! Farking dealer ships.


anyway they car is for sale $4500 hope it goes fast. new one is on a freight.

[loki]

Fark!!!!! Farking dealer ships.


anyway they car is for sale $4500 hope it goes fast. new one is on a freight.

How much did you pay for the car in the first place? $5000?