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

[Reaper]

Or he forgot to put the ground on top of the bellhousing back on and the di computer isn't on.

[bren5279]

Yeah those were all the first things I figured (like I said I do have a decent car background).
No I'm not cranking it for 30 seconds that would drain the battery or even possibly burn up the starter. Yeah I cranked it multiple times for up to 10 seconds.
No I wasn't quite that careless haha all grounds and all plugs are back in their places double triple n quadruple checked.

Almost off, just got the clutch to go, can't remember but I'm pretty sure the rpms didn't show but not positive (can't check now that the starters off but ill check again after its back)

[bren5279]

Originally Posted by Ozzman

You sure you don't have that disk 180 out of phase or something like that?

Think I may have found it, The timing disk behind the flywheel appears to have rotated a bit, so that may be slightly in the realm of what was causing it. going to put it back now.

[Tcoat]

Well????
The suspense is killing me!

[bren5279]

Ok well I'm not sure what it was but something along the lines when I redid it worked. I have a feeling it was the timing disk. Thorpedo ill shoot ya a pm.

Unfortunately now I have the problem of a grinding noise when decelerating between 2800 and 2200. Not sure if its the fact that I used redline MTL or what. And the struggle continues >.<

[zkv476]

Did you get a lightweight flywheel? It could just be gear chatter, I have a similar sound on deceleration. It's common with lightweight flywheels.

[bren5279]

Yuuuuuup Just found that out. Glad to know its normal. Wish there was a way to fix it

[bren5279]

Going to start a separate thread to see if anyone knows of any way to fix that.

[Reaper]

To fix what? Gear chatter from a lightweight flywheel? The stock flywheel is engineered to be as light ad absolutely possible without causing gear chatter. Some manufacturers use a dual mass flywheel in an attempt to go even lighter without causing chatter. A lighter than stock flywheel WILL chatter no matter what you do. It's physics.

[Thorpedo]

Originally Posted by Reaper

To fix what? Gear chatter from a lightweight flywheel? The stock flywheel is engineered to be as light ad absolutely possible without causing gear chatter. Some manufacturers use a dual mass flywheel in an attempt to go even lighter without causing chatter. A lighter than stock flywheel WILL chatter no matter what you do. It's physics.

Ugh.... No

OP just do some searching, there is lots of evidence out there that Reaper is incorrect. I know of two cars locally that run lightweight flywheels without gear chatter.

"It's physics"..... come on man.

[Reaper]

? Good luck. Gear chatter is caused by a flywheel not holding enough inertia and on deceleration. This is well known and the purpose of dual mass flywheels.
I'm not arguing this. Let the world know if you find a fix. Because BMW couldnt.

[shiro]

Originally Posted by bren5279

*** 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.

You beat me to it!!! That was the issue I had when I replaced my first clutch. That damn disk behind the flywheel LOL! I'm glad you figured it out


As for the other questions on chatter. I'm getting some pretty good chatter between 2-3K RPMs on acceleration and deceleration. I'm not 100% sure it is the clutch but it is quite possible. I'd love to troubleshoot it but I haven't found much on alternate possibilities than the clutch creating that noise. I'm currently using an Exedy Stage 4 clutch.

- Exedy Forged Chromoly Flywheel
- Exedy 6 Pad Cerametallic Friction Disc
- Exedy Hyper-single Forged Aluminum Cover

I'll have to check out the new thread when created.

[blown]

how did you have the disc installed incorrectly? it was flipped over?

[BRZnut]

glad to hear you figured it out. Do you need my address to send be the $50? From my post:


flywheel not lined up or backwards.


LOL