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Cranks but won't start

As long as it is running! And smoothly, I’d say everything is alright. Do double check the belt tension, but I think correcting the alignment was what the problem was

I haven’t done a TB on C30, but did it on my C27 years ago and numerous K series. The old spring tensioner was simple, almost primitive compared to what are on most modern engines. The whole turn the engine anti-clockwise to get rid of any slack seems to work fine as long as all the steps are followed.
 
As long as it is running! And smoothly
"Smoothly" is questionable but I'm just not sure. It starts immediately, revs quickly, but seems rougher then I remember but that was 12 years ago. I had a friend come over who had an NSX up till a few years ago and he said it definitely doesn't have a misfire but did seem rougher than normal. That's when I remembered I put the lighter flywheel on with the SOS 275. How much different is it with that lighter flywheel? I can't drive it yet so it's only without a load.
 
Despite the off-set crank pins, the 90 deg V6 is not a perfectly even firing engine. My C32 has always had a slightly rough sounding idle that is most noticeable when in the car probably because the noise / vibration is transferred through the front motor mount to the firewall which makes a good sounding board. A lighter flywheel will definitely make this worse. Manifold vacuum is steady. If your manifold vacuum is fluctuating then you have another issue.
 
Put a vacuum gauge on it and it was rock steady. Made my day. All that's left now is taking the covers off and setting the TB belt tension one last time.

The interior is still gutted but I'm ready to paint the top so it shouldn't take long now.
 
Put a vacuum gauge on it and it was rock steady. Made my day. All that's left now is taking the covers off and setting the TB belt tension one last time.

Steady vacuum is the correct answer! You didn't mention this in the previous posts; but, if the valve covers are coming off you might want to check valve clearances.
 
Steady vacuum is the correct answer! You didn't mention this in the previous posts; but, if the valve covers are coming off you might want to check valve clearances.
I didn't mention it, but I did check them and they were all within spec to my surprise. The car/motor has 180k on it and I only put 4k on it before it was parked so I don't know the maintenance history. I belive it was maintained by Shad at Driving Ambition. I bought the car from a coworker and know he took very good care of it based on how he operates. I parked next to it for years before I bought it from him. It wasn't going to anyone else. ;-)
 
Funny, I had my first hot start failure last night. Had to feather the gas to get it to fire. Car was warm, outside temp was 40F.

I feel like the NSX just does this every few hundred starts.
 
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