[xupthree60]

I have an 06 2.3l with 118k miles. This problem isn't constant but is becoming more common. It will run fine and then start kind of hesitating under acceleration, it will make the car start bucking as the rpms rise and drop while trying to accelerate. When it gets really bad the car is hard to accelerate past 10mph (about idle speed), and will eventually stall out. If it does stall out it will run a little better afterwards for about a minute and go back to being very bad, turning the engine on and off doesn't have the same effect.

I can not figure out what makes this come or go but it comes and goes on its own.

There is no check engine light on.

I'm starting to lean towards the TB being bad, do those symptoms make since to anyone else? Is there a way to check the resistance on the TB?

 

[MonoxideChild]

have you checked your PCV hose?

 

[xupthree60]

I'm going out to look and see if i can figure out where it is on this damn car. Would a bad one really make the car run as bad as i described?

 

[Robbgt]

I'm going out to look and see if i can figure out where it is on this damn car.

See here http://forum.mazda6club.com/2-3l-i-4/231527-how-pcv-valve-removal.html

 

[xupthree60]

See here http://forum.mazda6club.com/2-3l-i-4/231527-how-pcv-valve-removal.html

Thanks I did find that on my own though.
So my hose was cracked and I did replace it, but it did not fix my problem.

the car does run better and idle better now, when it does start acting up its not nearly as bad (so far) but the problem is still there. Under acceleration it just keeps dropping RPMs, almost like surging. You have to drive it for at least 15 to 25 minutes usually before it starts acting up.

if it matters I live in FL and its still like almost 90 today, I was sweating with the fan on me when i was changing out the pcv valve and hose.

 

[xupthree60]

Okay I take back what I said about it being better. I just tried to run to the bank and only made it probably 2 or 3 miles before it became undrivable, wouldn't let me get above 10mph, and had to turn around. I got to a very very busy Orlando intersection that's up hill turning left and it stalled on me and wouldn't turn back on till after the light turned red. It finally started back up and when the light turned green it started to go and then stalled again in the middle of the intersection! On the 3rd try it started back up and ran fine the rest of the way home.

I really need some help guys!

 

[rysbrnr]

I'm just gonna throw this out there, but are you getting a good spark or enough fuel? If the spark plugs are pretty old you could try some new plugs, they're cheap and easy to put in. Or maybe the fuel filter needs replacing. Both items are pretty cheap to buy.

I would also check for any vacuum leaks.

Any of the above can contribute to hesitation or stumbling under load. Does the car idle normally and only miss during acceleration (load)?

 

[xupthree60]

this morning i changed the positive cable from the battery to the fuse box because it had a lot of corrosion thinking that could be the problem... It ran fine around the block a couple times but as soon as i left the neighborhood it started falling on its face again.

I'm just gonna throw this out there, but are you getting a good spark or enough fuel? If the spark plugs are pretty old you could try some new plugs, they're cheap and easy to put in. Or maybe the fuel filter needs replacing. Both items are pretty cheap to buy.

I would also check for any vacuum leaks.

Any of the above can contribute to hesitation or stumbling under load. Does the car idle normally and only miss during acceleration (load)?

spark plugs have been replaced once, but if it was spark plugs wouldn't it throw a misfire code? besides i dont think thats it because it runs okay sometimes for a little bit before it starts acting up.

it idles perfectly fine and only does this after driving for a few minutes and under acceleration. when it is acting up the idle is still fine. it gets progressively worse till it wont let you accelerate above 10mph, then if you keep driving it will stall. after the stall sometimes it starts right up but sometimes it wont and you have to wait a couple minutes before it will let you start. once it does start back up after a stall it runs okay again for a few minutes and then the cycle starts over again.

 

[forsakenmazda6]

hey, this happened to me a while back. I checked everything from fuses to spark plugs and coils and alternator. Even thought my fuel pump assembly went bad. Before I was going to invest $700 on a fuel pump, I went to the auto parts store purchased "water in fuel treatment" and a 103(or maybe it was 109) octane booster, went to Shell and poured the entire contents into my tank, filled my tank up with 93 octane fuel. Boy was I a happy camper, my car didn't act up like that again, and never shut off on me. Was a quick an easy fix for me. Try that! I saved $700, hopefully you can too! Let me know how it goes for you

 

[xupthree60]

hey, this happened to me a while back. I checked everything from fuses to spark plugs and coils and alternator. Even thought my fuel pump assembly went bad. Before I was going to invest $700 on a fuel pump, I went to the auto parts store purchased "water in fuel treatment" and a 103(or maybe it was 109) octane booster, went to Shell and poured the entire contents into my tank, filled my tank up with 93 octane fuel. Boy was I a happy camper, my car didn't act up like that again, and never shut off on me. Was a quick an easy fix for me. Try that! I saved $700, hopefully you can too! Let me know how it goes for you

did your car idle fine and also drive fine for a few minutes before acting up?

 

[forsakenmazda6]

yup, it would drive without symptom, and then out of no where, be it on the highway or down the street.

 

[twright1781]

I'm currently having similar issues. My 2006 mazda6 bucks/lurch's in every gear if I accelerate hard. if I drive like my grand mother I see no issue. It's not throwing any codes, I inspected the vacuum system and intake system and found no issues. I also cleaned the O2 sensor. I did discover that the valve cover gasket was leaking oil onto the spark plugs. I replaced the plugs and repaired the gasket, but it had no effect on the problem. I had my car looked at by both a local mechanic as well as a Mazda dealer mechanic. All it did for me is lighten my pockets.

To my point, this seems to be a common Mazda failure.

 

[fr3akaz01d]

I've got a similar issue happening to my mazda, only it doesn't seem to be bad enough to the point where my engine will completely shut off. It hesitates/stalls though on occasion after driving it for a while, and it also doesn't throw out any codes. I don't think I noticed that this happened until after I changed out my spark plugs a few weeks ago, but I'm not 100% sure about that. I think the problem occurred prior to that, but now it's become much more frequent.

I'll try adding that tank cleaner in my car and see if it works, but I'm not so sure that it'll help. - Hope it does thoug

 

[habidigeeshmaw]

hey, this happened to me a while back. I checked everything from fuses to spark plugs and coils and alternator. Even thought my fuel pump assembly went bad. Before I was going to invest $700 on a fuel pump, I went to the auto parts store purchased "water in fuel treatment" and a 103(or maybe it was 109) octane booster, went to Shell and poured the entire contents into my tank, filled my tank up with 93 octane fuel. Boy was I a happy camper, my car didn't act up like that again, and never shut off on me. Was a quick an easy fix for me. Try that! I saved $700, hopefully you can too! Let me know how it goes for you

sooo

 

[habidigeeshmaw]

I've got a similar issue happening to my mazda, only it doesn't seem to be bad enough to the point where my engine will completely shut off. It hesitates/stalls though on occasion after driving it for a while, and it also doesn't throw out any codes. I don't think I noticed that this happened until after I changed out my spark plugs a few weeks ago, but I'm not 100% sure about that. I think the problem occurred prior to that, but now it's become much more frequent.

I'll try adding that tank cleaner in my car and see if it works, but I'm not so sure that it'll help. - Hope it does thoug

did it work

 

[Candymtzz90]

I have an 06 2.3l with 118k miles. This problem isn't constant but is becoming more common. It will run fine and then start kind of hesitating under acceleration, it will make the car start bucking as the rpms rise and drop while trying to accelerate. When it gets really bad the car is hard to accelerate past 10mph (about idle speed), and will eventually stall out. If it does stall out it will run a little better afterwards for about a minute and go back to being very bad, turning the engine on and off doesn't have the same effect.

I can not figure out what makes this come or go but it comes and goes on its own.

There is no check engine light on.

I'm starting to lean towards the TB being bad, do those symptoms make since to anyone else? Is there a way to check the resistance on the TB?

Did u ever figure the problem out?? Im having the same issue i even replaced that expensive fuel pump and still does it!!!