Problem... ECU or Boost?

[jeffmsp]

idle control motor? did you try adjusting your idle to say 1000rpm and then seeing if the car stalls shifting from 3k to neutral?

 

[peepsalot]

Did they test for a hole in the IC?
Edit: nevermind, just read you swapped it.

 

[SpeedBeaver]

I called my dealer just before leaving work. Turns out they just checked the EGR valve by looking at it... so I pleaded my case based on your comments and I told them to test the EGR better. Since they had one in stock they are gonna try to put it in tomorrow. Hope it works cuz I'm out of patience.

 

[boostisgood]

What I did so far:
checked every vaccum line
checked all the pipes on the turbo system for leaks
took my CustomMSP SMIC out and putted my OEM smic in.

What the dealer did so far:
changed the MAF
changed the BPV
changed the TB
changed the primary O2 sensor on the mainfold
changed the ECU
checked the cats for bottlenecks
checked the mainfold for leaks
rechecked the vaccum lines
rechecked the pipes
checked the EGR (dunno at what extent they did)


And yeah, I know lots of local msps. I'm co-admin on a french canadian forum (www.mazdatuning.com)

Get your car out of that dealership ASAP. apparantly they dont know s***. FIRST, Ecu's RARELY and I mean RARELY go bad, second, 02 sensor, same thing.

It looks to me, they are just changing parts to see if they can get the problem to go away instead of really Troubleshooting it.

All they need to do is drive the damn car with a scantool and see whats going on in the data stream. Especially if it stalls, they should have a freeze frame of that very instant of whats going, and could be causing your issue.

Im sorry your having such an issue, but seriously, look for another service department at another dealership to look at your car. Also, get Mazda to pay for the tow there.

(please dont think Im flaming you because I am not. I feel for you, and it sucks that these techs cant even properly troubleshoot your issue. Thus causing you to not have your car for this ammount of time)

 

[smo0f]

dude, they owe you a new car. sounds like it's a lemon

 

[jeffmsp]

try adjusting your idle higher to 900-1Krpm to see if it stalls.

 

[boostisgood]

How do you adjust idle when its computer controlled ?

EDIT: While looking on Mitchells and AllData, I found no adjustments for idle speed.

 

[SpeedBeaver]

How to go from total happyness to totally pissed in one hour!!

1st: you get a call early in the afternoon to tell you that you car is finally fixed!!
2nd: you drive home to get your car before the dealer closes and get you car back. You give back the 2.0L mazda3 they gave you. They lock the place after you leave.
3rd: you drive home with a huge smile on your face and can't recreate the issue.
4th: you have dinner then you go shopping a little.
5th: you have to stop at a freakin red light and the car nearly stalls!!!!!
6th: you test it again: acceleration, clutch and wait until the rpms drop to a near 0.

So it's going back to the dealer on monday I guess.

I realy am pissed you can't imagine how!!

 

[Brian MP5T]

Just, wait, the ECU is probably relearning...

 

[SpeedBeaver]

Just, wait, the ECU is probably relearning...

Gonna give it a day or so. I have to drive back to Montreal tomorrow. We'll how it does on a long ride.

Plus the fact of taking out CustomMSP's upgraded SMIC is showing. I feel the difference. And I don't know if my ECU has been reflashed since they replaced it.

 

[Zhan]

How do you adjust idle when its computer controlled ?

EDIT: While looking on Mitchells and AllData, I found no adjustments for idle speed.

There's a screw in the engine bay (near the throttle body?) I think.

 

[Brian MP5T]

There's a screw in the engine bay (near the throttle body?) I think.

Do Not Ever touch that screw. It is set at the factory in Hiroshima and is not an adjustment for the idle. There is an auto adjuster built into the TB and whatever is causing it to malfunction will simply relearn the new setting and the problem will instantly manifest itself again until it is fixed..

 

[igdrasil]

changed and checked parts but no pressure test, man you may have all pipes checked ok but it may expand, leak some boost and stall when releasing the pedal. Even the intercooler may have developed a crack. Those cracks on intercooler and pipes are invisible unless you bend them or do a pressure test.

 

[SpeedBeaver]

Does anyone have the TSB for the EGR valve?

I'd like to check something. Thanks.

 

[SpeedBeaver]

Well, the car went back to the dealer this morning to the service department surprise. They FINALY agreeded to look at the freakin EGR valve. I had a call late today from the senior tech and he told me it was indeed the EGR that was defective. They are gonna replace it tomorrow since they didn't had the time to do it today.

I'm still waiting to see if this will fix the problem. (I'm still on my guard after everything they went trough to "repair" my car).

I'll update this thread when I'll have the final results.

Thank you everybody for your imput.

 

[BlkZoomZoom]

Get your car out of that dealership ASAP. apparantly they dont know s***. FIRST, Ecu's RARELY and I mean RARELY go bad, second, 02 sensor, same thing.

It looks to me, they are just changing parts to see if they can get the problem to go away instead of really Troubleshooting it.

All they need to do is drive the damn car with a scantool and see whats going on in the data stream. Especially if it stalls, they should have a freeze frame of that very instant of whats going, and could be causing your issue.

Im sorry your having such an issue, but seriously, look for another service department at another dealership to look at your car. Also, get Mazda to pay for the tow there.

(please dont think Im flaming you because I am not. I feel for you, and it sucks that these techs cant even properly troubleshoot your issue. Thus causing you to not have your car for this ammount of time)

It sounds like they have a newbie working on your car.
I will say that I have replaced 2 ecu's in the past 3weeks, all of which fixed the problems.

Good luck.

 

[BlkZoomZoom]

How do you adjust idle when its computer controlled ?

EDIT: While looking on Mitchells and AllData, I found no adjustments for idle speed.

There is a procedure to set the idle. You use the wds and jump a couple pins on the diag. port. If you know what you are doing its pretty easy. However that would be a bandaid and not fixing the actual problem.

 

[SpeedBeaver]

Should get my car back tomorrow and I'll test it hard just to be sure.

 

[jeffmsp]

i hope it works out for you, like i said i had the exact same problem with my buddies mx3, it was the egr as well. let us know how it goes.

 

[SpeedBeaver]

let us know how it goes.

Will do