noise at cold start

90 red sc

Registered User
90 SC. Knocking/rattle at cold start, then when warms up will have a slight rattle when brake applied in Drive. slight acceleration (while holding brake) sound goes away. If in park and gun trottle, rattle back then stops as RPM comes down. Most previlant at cold start and when warm at stop light. Any suggestions.
 
Did you pop the hood and get out and rev it by the TB and listen for where the sound is coming from? Long screw driver or a crow bar and put it to your ear and it could probably be found at idle.
 
appears to under and just in front and under drivers side. Have lost not power nor does it act up when the sound is there.
 
Exhaust is what should probably be checked first. Heat shield(s) and Cat, but the cat may be rattling from the inside.
 
Transmission mount would be the next thing. Without being there to hear/see it..........

There isnt much to "rattle" under the car other than exhaust, heat shields and the cat.
 
When you have it in park, and you push the accelorator, it rattles and reves with the engine, when you take you foot off, then the sound does not match the rpms when the engine comes down. It is slgihtly behind.
 
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