That could be alot of things. Where under the hood do you hear the noise? Oil pan, valve cover, by the pulleys, etc.

 

I only her the noise when it is first started after that nothing.

 

Check the motor mounts?

 

ahhh i have the same problem and i have yet to figure out what it is....i cant recreate it because it happens so randomly...hasnt happened in weeks...but it could just happen next time i start my car...but it feels like a slamming thud just really quick...like something hit somewhere underneath

 

That is exactly the same thing if you find it out let me know. I am going to change my motor mounts if it helps Ill let you know.

 

Don't change them unless they're broken. Check them 1st by trying to move the engine around by pushing or prying. You can put it in gear with the hood up & parking brake on, reverse and drive, and see if it moves alot.

 

i had the same noise. turned out to be my exhaust hitting my trans crossmember which sits right under you. get under there and check the rubber thing that is atatched to your exhaust hanger right there. mine was rotted and broke off so my exhaust was able to bounce up and down. and it only did it when i was starting my truck

 

i had the same noise. turned out to be my exhaust hitting my trans crossmember which sits right under you. get under there and check the rubber thing that is atatched to your exhaust hanger right there. mine was rotted and broke off so my exhaust was able to bounce up and down. and it only did it when i was starting my truck

Mine does the same thing(very rarely) and I haven't checked it out cause it sounded like the exhaust so I figured it was.

:dunno:
​

 

mine will clunk like someone put a wrench in my flywheel, and its the starter, when i had an electrical problem and my battery got low. when the battery was low the starter turns a bit then CLUNK and spins again and starts. just a heads up, if it does it one morning throw a multimeter on it and check the battery voltage. just my 2 cents.

 

mine will clunk like someone put a wrench in my flywheel, and its the starter, when i had an electrical problem and my battery got low. when the battery was low the starter turns a bit then CLUNK and spins again and starts. just a heads up, if it does it one morning throw a multimeter on it and check the battery voltage. just my 2 cents.

having the exact same thing...feels like somebody jamed a rod somewhere...but the engine doesnt actually stop (obviously)