Help!! Car Wont Start After Clutch Swap (25$ reward for solution!!)
 

*** SOLVED****

Out of all the cars Ive ever worked on Ive never been so stumped…. Just swapped a clutch in and now it won't start, yet it turns over just fine???
I officially have no ideas where to even begin… so Im offering 50$ to anyone who can lead me to the solution because I REALLY dont want to have it towed to a stealership.
2015 manual brz with prox key

Symptoms:
-wont start
-cranks perfectly fine
-key worked fine the night before
-no CEL
-all plugs plugged back in
-Doesnt even sputter or try to ignite…



What I did:
Swapped the clutch just exactly as the DIY says (including unplugging the battery), and changed the fluids with it.

Things Ive ruled out
-Battery is fine
-Starter turns it over fine
-Checked all fuses
-can hear fuel pump working
-rechecked all grounds
-has half tank of gas and started perfectly the night before
-(turns over, eliminating clutch switch, any jams, key, etc)


*** SOLUTION: Make sure the timing disk behind the flywheel does NOT rotate at all. Not 100% sure it was what caused it but after reinstalling everything and repositioning the disk it now starts.

Did you forget to plug something back in? Check any harnesses.

Also see if there are any codes set

No codes and there were only 2 plugs unplugged plus the battery, all are fine

Sounds like the anti theft system to me.

You sure you didn't pinch any wires between the block and bellhousing?

Absolutely positive.
Would the anti theft system allow it to still turn over?

I tried starting mine with the two plugs on top of the transmission unplugged and it fired right up (just fyi).

Does the exhaust smell like raw fuel?

Watch this.

[ame="https://www.youtube.com/watch?v=4uwZpFu8Z10"]https://www.youtube.com/watch?v=4uwZpFu8Z10[/ame]

I know his wasnt turning over. But it might be worth a watch.

Nope doesn't smell like fuel at all, I HIGHLY doubt its flooded

Yeah my key light goes green and it turns over fine so idk…?:iono:

Do you have the ability to scan for codes?
Have you tried disconnecting the battery again?
Perhaps check the owners manual under antitheft.


Is there a crank position sensor that reads off the flywheel? Because if the ECU doesn't see the crank position signal it won't fire the injectors or the coils.

No but there also aren't any codes being thrown…
Yeah twice
Going to do that, but wouldn't that cause that to not turn over at all?

Yeah thats my main idea, however theres a sensing disk behind the flywheel that senses the position and its on the right way (as I can see from the opening at the bottom of the trans.

Awesome, dealership is closed. Upping it to 50$

You sure you don't have that disk 180 out of phase or something like that? If you can pull the #1 coil put a plug in it and reconnect to the harness and watch if it fires, that can narrow down problems. If you get one spark, and one spark only the problem likely lies with the crank sensor or the tone wheel. My money is on the tone wheel not being installed correctly or damaged.