While surfing other Volvo boards I came upon an S40 owner with the same loud "Crack/Cracking" noise. It comes from the engine compartment/firewall area. It started when the real cold temperature set in! The sound happens from a dead stop.....press the gas pedal/car starts to move and "CRACK"! Sort of a plastic sound but loud...and its the same sound all the time! It lasts until the engine/engine compartment warms up, then if you press on the gas from a dead stop....no noise! I don't recall this happening in warm temperatures!!!! Someone has suggested that the engine mounts might be the culprit. I have 94k on my yucky Blackberry Volvo that otherwise is running fantastic!!!! Bill
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