Unicorn Won't start

Discussion in 'Mazdaspeed 6 Troubleshooting' started by Binary Assault, Jun 2, 2020.

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  1. Binary Assault

    Binary Assault Gold Member

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    Long story short, I purchased a speed6 as is (not running), put it all together and now it won't start. When I received it, the engine was 're-manufactured'. The engine was mounted to the car, but nothing was really hooked up. I installed all the hoses/wires/turbo/etc..

    When turning the key, all I get is tons of clicking but won't crank. Very rarely, I get it to turn over. I've tried cranking it for 30 seconds at a time with no success. But it's about 1 in 10 times it starts over, each attempt is usually a day apart (typically because I run out of time troubleshooting).

    Things I've done so far:
    Replaced battery
    Replaced starter
    Replaced starter trigger wire
    Verified voltage going to the trigger wire
    Verified all fuses in the engine bay and under the drivers side dash
    Verified continuity to any visible grounds I can see (including the HPFP ground).
    Swapped relays around the fuse block
    Verified continuity between the starter power wire and the battery
    Bypassed fuel pump resistor

    It's driving me nuts. Since I don't know the history of the car, I'm starting to think it's an electrical issue.
     
    Last edited: Jun 2, 2020
  2. Raider

    Raider Administraider Administrator Platinum Member

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    I would be concerned about the engine. Try to get a compression test on it when you can get it to crank. I wonder if it is in the ignition switch.
     
    Raider, via a mobile device, Jun 3, 2020
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  3. Binary Assault

    Binary Assault Gold Member

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    I started a compression test and realized I can't because it won't crank lol. Was pissed once I realized that.
     
  4. Raider

    Raider Administraider Administrator Platinum Member

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    May be frozen up. Got fuel, spark, ground?
     
    Raider, via a mobile device, Jun 3, 2020
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  5. The_big_dill

    The_big_dill Greenie Member

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    What kind of clicking are you hearing? This is with a fresh battery and a booster pack attached? What is the condition of your battery terminals?

    Define "Turn over" in terms of what you have seen, that statement can mean many things.

    1/10 times it starts and runs? or the starter motor cranks? When/if it cranks, is it uninterrupted/healthy cranking?

    Any other lights on the dash?

    Most common reasons this platform fails to crank from my opinion:

    - Poor connection to the starter motor signal wire. The single pin spade connector. Sounds like you replaced this, but have someone try to crank the car while you move this connector around. Spade connectors suck for longevity in such an environment.
    - Main Relay in the fuse box. This is more common on the 3s, not sure if it is similar on the 6s.
    - Start motor failure. Looks like you replaced this. IF this is still suspect, try to hold the key in the crank position longer than usual, but don't overdo it.
     
  6. Awafrican

    Awafrican Silver Member

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    As the big dill pointed out it could be starter motor failure if you're only hearing clicking. Check your starter

    Now my buddy had something similar when we reinstalled his engine, we remounted the started for whatever reason the gear didn't line up properly and weren't catching so a simple off and on solved the issue.
     
    Awafrican, via a mobile device, Jun 29, 2020
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  7. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

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    I just got this fixed. Remove the serpentine belt and confirm that all of the accessories turn. My alternator would not turn even with a breaker bar on it. Car would start easily with no belt installed. Obviously shut it down fast if the belt is off
     
    Easter Bunny, via a mobile device, Jul 1, 2020 at 8:47 PM
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