deegaw11

Owned my current s2000 for about 7 years now and it recently developed a sound on a cold start that will last till the vehicle warms up. During the sound the engine vibrates really bad that you can feel it throughout the whole cabin.

I went ahead and did a valve adjustment and followed the DIY step by step and noticed while I was doing the intake side it was much tighter than the exhaust side. It would also take ALOT less movement to adjust compare to the exhaust side. For instance on the exhaust side I can turn it 1/4 turn check clearance and it’ll be close to the clearance I’m trying to set but for the intake side of I turn it a 1/8 of a turn it’ll be too much. I literally have to turn it 1/16 to set the clearance.

Does that seem normal? I’ve done valve adjustments a few times before but this is my first time on a s2000. It still runs great but the noise and vibration on a cold start has me worried.

thanks in advance.

Slowcrash_101

The intake valves have tighter clearance than exhaust. The intake valves have intake air, and fuel to cool them so they expand less. Exhaust valves need more clearance because they only get contact cooling with the guide and seats. As a result they expand more.

You could have bad injector seals. They don't seal well in a cold start allowing unmetered air into the engine.

Billman250

Broken retainers show no symptoms. Not even noise.

deegaw11

thanks Bill that makes me feel better. It’s been a long time man, if I still lived in NY then I would definitely have you take a look at it. Nobody out here I trust with my S.

deegaw11

Will that cause it to have a noise and vibration from the engine? It completely goes away when the engine warms up tho.

Slowcrash_101

Maybe the seal expands and limits the unmetered air, when everything is cold during start up, you get unmetered air.

deegaw11

the sound does happen right after you hear that winding down sound that comes on a couple seconds after a cold start. But would the leak cause it to sound like piston slap?

RolanTHUNDER

Can you take a video and post it here?

Slowcrash_101

Piston slap gets louder with revs.

deegaw11

here’s a video I posted on YouTube. You can hear what sounds like marbles in the engine.