2005 MS 6 Won't Start - Please Help

Discussion in 'Mazdaspeed 6 Troubleshooting' started by MSMiata, Jan 3, 2023.

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  1. MSMiata

    MSMiata Greenie N00B Member

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    - My son totaled his 2012 Mazdaspeed3, but what a sweet car that was. We had just gotten it the way he wanted, had a good tune on it, racing seat, everything. Oh well, what are you going to do?
    - He found a 2006 Mazdaspeed 6, which I had shipped up from Florida. Of course, he wanted to add some parts, so I agreed to use the difference in the insurance money and the price of the car to get him a few; cold air intake, turbo-back exhaust, high pressure fuel pump internals, low pressure fuel pump, blow off valve, plugs, coil/wires, battery, and a stereo (which has not yet been installed). I really spent more than the difference, but it was Christmas and everything. Besides, some of this stuff is hellacool.
    - I installed most of the parts myself, but I think my son installed the cold air intake. For one reason or another, once the intake was installed, the car would turn over (crank), but would not run - it seems as if it is not getting gas. We tried adding the stage 1 tune on the access port - no luck. There was some air box like thing down in the lower, front, driver's side of the engine bay (almost in the bumper cover), which we have covered. It seems to be like an air induction you might see on an old car, but I really don't know what it is. I think my son was able to get the car to run very rough, for just a few minutes, with that thing covered with duct tape. I stuck an old gas cap in it, because thats the size of the tube that would have gone to the original air box.
    - I do not hear the pump running (under the back seat), although I replaced it with the higher capacity pump. I can straight wire it, and the pump definitely works. Even with the pump straight wired, however, the car still will not start.
    - One last thing I'll mention is that when I try to start the car, and pump on the gas pedal, I hear a vacuum sound, almost like a blow-off valve releasing. I don't know if that indicates a vacuum leak, because I don't know what this car is supposed to sound like. I have heard that certain vacuum leaks can prevent these cars from starting.
    - If you check my profile, you'll see that I am pretty darn old. I am more comfortable working on older carbureted cars than these electronic fuel injection motors with an ECM or ECU or whatever you call them. I am a little out of my depth in diagnosing this problem, so I came to this site to beg for your help. I'd really like to get my son's car running for him (and then I can get back to work on my 2005 Mazdaspeed Miata project).

    - Thank you for any help you can give me.
     
  2. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    What have you done since the last time it started?
     
    Easter Bunny, via a mobile device, Jan 3, 2023
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  3. Sho

    Sho Silver Member

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    What's the diameter of the intake? If larger than 2.5", it'll need a tune to run.

    If youre not hearing the fuel pump prime when flipping the key to the on position, you'll need to look into that as well. Check that the fuel pump resistor on the driver side frame rail in the engine bay is plugged in and operational. And also check the connector on the top of the fuel pump basket. Lastly, since you upgraded the in tank pump, did you use the orings where it mounts to the basket? If not, it will not seal and will have fuel delivery issues
     
    Sho, via a mobile device, Jan 4, 2023
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  4. MSMiata

    MSMiata Greenie N00B Member

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    Pretty much everything I described in the original post (intake, exhaust, fuel pump, plugs, wires, etc.). I probably should have done it one thing at a time, but I didn't anticpate this happening.

    I am pretty sure the intake is by Cork Sport and is 4" in diameter. I tried adding the stage one tune from the Cobb TUning access port on the web. Based on the research my son did, with the mods we were doing, that was the recommended tune. Is that not correct? Will it not start at all without the tune, or would it just run rough as hell? This car doesn't even start - turns over strongly, but won't run.

    I need to figure out the fuel pump. and will check the things you recommend. I did check the connector to the top of the basket, but will do so again. I believe I was getting power to it, but it is a sort of weird set up. There are four prongs on the connector, and only one has power. It is almost as if there is a switch, or relay, or some such in the connector itself. Is there? Also, and this may not have anything to do with anything, but why does it look like there are two of these things under the back seat? There is a similar plate and some plastic basket under the passenger's seat side of the back seat of hte car.

    In regards to the o-rings, I am pretty sure I did that correctly. I was super carefule because we had that issue when we changed out the pump on the 3 (or had someone do it). My son was driving and the car would go into limp mode or shut off completely. The mechanic who changed the in-tank pump on the 3 did not do the o-ring correctly, and the car was starved for fuel. That cost me a bit of cash, so I decided to do this one myself. I may not be the best mechanic in the world, but I knew I wasn't going to let that one particular issue get me again. Unfortunately, I did not anticipate the other issues.

    Thanks for your help - I'm going to go out to the car now and will report back later.

    If the fuel pump resistor is the part number 05677-0790, I replaced the one in this car with the one we had taken from the Mazdaspeed 3 when we thought that was the issue. I'm 92% sure it is operational, but I need to check to see if it is getting power to it. I also may take it off and bench test it to see if it appears functional.

    I checked both sides under the back seat, and both sides are getting power to one of the four prongs in the connector. The cage on the driver's side has a green connector on the hose to it, and the hose on the passenger side has a yellow connector. This thing doesn't have two in tank pumps does it?


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    Last edited by a moderator: Jan 6, 2023
  5. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    You need to figure out what intake you have and run a tune that has the right maf calibration or the car won't run correctly

    Or not at all if you have a 4 inch and stage 1 tune which is for stockish sized intakes or 2.6## inch
     
    Easter Bunny, via a mobile device, Jan 6, 2023
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  6. MSMiata

    MSMiata Greenie N00B Member

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    It is a 4" intake. Is there a specific time available, or do I need to find someone to do it? I don't even know where to start in all of this.


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    MSMiata, via a mobile device, Jan 7, 2023
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  7. MSMiata

    MSMiata Greenie N00B Member

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    Correction - a specific tune available.


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    MSMiata, via a mobile device, Jan 7, 2023
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  8. Easter Bunny

    Easter Bunny Professional Engineer Motorhead Platinum Member

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    For that size intake you will need a custom tune. Honestly if you are still stock turbo the intake is way bigger than you need
     
    Easter Bunny, via a mobile device, Jan 7, 2023
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  9. Sho

    Sho Silver Member

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    100% need a custom tune. The off the shelf tunes are for stock diameter intakes only. And typically only work well if you're using only Cobb parts

    https://www.freektune.com/

    And
    https://www.pd-tuning.com/

    Are the top mazdaspeed tuners and can tune you remotely
     
    Sho, via a mobile device, Jan 7, 2023
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  10. MSMiata

    MSMiata Greenie N00B Member

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    Thank you all for your help - I'll keep you posted.


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    MSMiata, via a mobile device, Jan 8, 2023
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  11. MSMiata

    MSMiata Greenie N00B Member

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    I cannot thank you guys enough! After fighting this car for over a month, it finally runs! I got the tune from Freektune, and I still need to dial it in, but it works. Thank y'all so much.


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    MSMiata, via a mobile device, Jan 12, 2023
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  12. jdab555

    jdab555 Greenie Member

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    Awesome! Trust your tuner and do what he says and you'll be fine.
     
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