Hi all. I'm new here. I inherited my husband's 2010 Mazdaspeed3 last year to be my winter driver. It has about 98,xxx miles and he babied it the whole time he drove it. Was his dd for years. He said it's always had a very mild stutter in the acceleration at certain RPMs, and he mentioned it to the dealer when he first bought it but they never found anything wrong. Well, it seems to have gotten worse. We've spent tons at the dealer, they had it three separate times. The last time I was certain it would be fixed (they replaced the EGR) but the misfire came back a few weeks later. We can't spend any more money on this car but I want this fixed. I hope to drive it another 100,000 miles. So I'm hoping you guys can help.
I did a bunch of searching and found lots of threads on misfires and stuttering, but each one is a little different and most said the EGR was the issue. Well, not here.
Here's what happens:
At completely random times, when I hit the gas, not crazy hard, but hard enough to push the engine a little, sometimes it will stutter or slip. Sometimes a little, sometimes hard enough to jerk the car a little. I'm pretty sure this always happens before the turbo kicks in. It's almost like I've caught the car off guard and it stumbles before it moves. After one or maybe two slips, full power will kick back in and it's all good. At first it seemed worse on rainy days. I learned to expect a few stutters on my commute. But sometimes it happens on dry days too. It could be my imagination but it also seems worse when the tank is at 3/4 or lower.
Here's what we've had done:
visit 1: computer update
visit 2: replaced spark plugs, coils, fuel injectors
visit 3: EGR
The dealer mentioned that the engine has a lot of carbon build-up. They suggested fuel additives. They said everything passed the final diagnostic they did. The EGR was failing tests which is why they replaced it. Everything else passes now. When they drive it, they never feel the misfire. But every time I brought it in there were misfires logged so they knew I wasn't making it all up.
Weeks went by after the EGR was replaced with no misfires. But now they are back.
My husband is going to clean the mass air flow sensor and see what happens. I think we're also going to try some fuel additives but we both think that's such a weird fix for something like this. It can't really be that simple.
What do you guys think?
I did a bunch of searching and found lots of threads on misfires and stuttering, but each one is a little different and most said the EGR was the issue. Well, not here.
Here's what happens:
At completely random times, when I hit the gas, not crazy hard, but hard enough to push the engine a little, sometimes it will stutter or slip. Sometimes a little, sometimes hard enough to jerk the car a little. I'm pretty sure this always happens before the turbo kicks in. It's almost like I've caught the car off guard and it stumbles before it moves. After one or maybe two slips, full power will kick back in and it's all good. At first it seemed worse on rainy days. I learned to expect a few stutters on my commute. But sometimes it happens on dry days too. It could be my imagination but it also seems worse when the tank is at 3/4 or lower.
Here's what we've had done:
visit 1: computer update
visit 2: replaced spark plugs, coils, fuel injectors
visit 3: EGR
The dealer mentioned that the engine has a lot of carbon build-up. They suggested fuel additives. They said everything passed the final diagnostic they did. The EGR was failing tests which is why they replaced it. Everything else passes now. When they drive it, they never feel the misfire. But every time I brought it in there were misfires logged so they knew I wasn't making it all up.
Weeks went by after the EGR was replaced with no misfires. But now they are back.
My husband is going to clean the mass air flow sensor and see what happens. I think we're also going to try some fuel additives but we both think that's such a weird fix for something like this. It can't really be that simple.
What do you guys think?