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Old 03-20-2016, 05:07 AM   #1
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Angry 2000 Miata won't start after head gasket change

Overheated Miata but it still ran sorta OK. No real compression. Pulled head and had it professionally rebuilt. Reinstalled head and now car cranks fine but won't even try to start. Ran scanner on it and it gives a P1345 code. Looked up code and it seems to indicate a bad camshaft position sensor or a diagreement between camshaft position and crankshaft position.

Should I just replace the cam sensor or how would you approach the problem?

Thanks.
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Old 03-20-2016, 09:44 AM   #2
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Post pictures of the crank at TDC (I want to see the mark on the cog lined up with mark on the engine), Then post a picture of the 2 cam gears, then a picture of the front 2 cam lobes. This way we can verify timing is correct.
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Old 03-20-2016, 09:45 AM   #3
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if the cam sensor wasn't bad before, what makes you think it is now?

dont you think the most logic thought is you forgot to hook you cam sensor back up? or did the timing belt wrong?
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Old 03-20-2016, 10:06 AM   #4
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P1345 says something is wrong with cam sensor.
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Old 03-20-2016, 10:09 AM   #5
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did you plug it back in?


I know this is crazy, but im assuming you unplugged it to remove the head.
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Old 03-20-2016, 07:37 PM   #6
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How do I post photos? I get a message about "token missing"?
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Old 03-20-2016, 11:01 PM   #7
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tone ring is in the wrong orientation,
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Old 03-21-2016, 03:13 PM   #8
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So I figured out this is my Friend up near KC, he swapped some heads around but didn't keep cam sprockets with the block, only the heads.

So, long story short, there's no cam nubbins to trigger as he's got it together now. I expect it should work alright after swapping those back around.

Not sure if that'd be considered a tone ring, but that's a damn good guess blkmkiii...
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Old 03-21-2016, 03:52 PM   #9
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Did he swap from a 94-97 head to the 99/00 head? Then keep the older cam gears? Those are just an odd thing not to swap, but would without a doubt cause the issue he is having.
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Old 03-21-2016, 03:59 PM   #10
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I'm not entirely sure what's happened. His car is a 99 or 2000 and the head we swapped over was supposed to be a 99. The manifold fits, so it must be right...

I can't find the cam sprockets from the old protege 1.8 I bought from him though, I wonder if they didn't accidentally get switched at some point?





Oops, at least the intake manifold doesn't have to come off again
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2000 Miata won't start after head gasket change-zwtjwrd.jpg   2000 Miata won't start after head gasket change-hx6rw1k.jpg  
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Old 03-21-2016, 04:01 PM   #11
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lol. important details you shouldn't leave out of posts:

Quote:
I replaced the head with a used, but rebuilt head that I bought from a spec racer.


Quote:
Pulled head and had it professionally rebuilt. Reinstalled head and now car cranks fine but won't even try to start.
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Old 03-21-2016, 04:04 PM   #12
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Quote:
Originally Posted by Braineack View Post
lol you got ripped off. enjoy your 94-97 head.
What are you rambling on about now? 94-97 heads do not bolt up to NB intake manifold....

Someone closer whack brain for me, he needs a reboot
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Old 03-21-2016, 04:35 PM   #13
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DEEZUMS fixed it! It runs great now. Thanks.

Problem was that I thought all sprockets were identical. Now the Intake sprocket has the "bumps", but I left the exhaust alone since the cam position sensor only looks at the Intake sprocket.
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Old 03-21-2016, 04:35 PM   #14
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Quote:
Originally Posted by deezums View Post
What are you rambling on about now? 94-97 heads do not bolt up to NB intake manifold....
I'm pretty sure that the manifold will physically fit onto the head, but with the caveat that the ports don't line up.

This image is of an NA intake gasket on an NB head:



Source: Project Miata Streetfighter: Vol 3 "Getting our Head straight"
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Old 03-21-2016, 06:03 PM   #15
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Quote:
Originally Posted by Joe Perez View Post
I'm pretty sure that the manifold will physically fit onto the head, but with the caveat that the ports don't line up.

This image is of an NA intake gasket on an NB head:



Source: Project Miata Streetfighter: Vol 3 "Getting our Head straight"
Good to know, not something I've ever dealt with personally.

Glad to hear it's running again!
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