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Why is my 1991 Mazda RX6 engine noisy when cold ?

Front engine whine and rattle when cold then smooths out when warm .

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 99 sl rattle in front when engine warms, not a rod knocking.

The solution is simple and easy, if not cheap. You have a defective upper motor mount. If you open the hood and look for the motor mount on the left hand side near the accessory belt, you will notice that the rubber has shrunk. THAT is the problem.
This will only make noise at idle at a stoplight and doesn't do it all the time.
I have a 1999 Saturn SL and have fixed this problem once by replacing the motor mount. The first time, it was just out of warranty and only had about 60,000 miles on it. It has manifested itself again (started a while ago - now has 114,000 miles on it) I am the only owner of the car and it is now 10 years old. I won't change it again unless they redesign the motor mount.
You can replace the motor mount yourself if you are somewhat handy - it will cost around $100 for the part if I recall correctly. Make sure you prop the motor up; it should take about 30-60 minutes.

Posted on Dec 06, 2008

  • 32 Answers

SOURCE: rough idle, surges when cold

have it scanned,ck' tps sensor,mass air sensor,idle air sensor for output...kev-mn.

Posted on Dec 10, 2008

  • 2692 Answers

SOURCE: Noisy rattle in engine compartment of 2003 Impala on cold start.

Take a broom handle(with the broom removed) or long heavy dowel rod , start the engine when cold and place one end of handle to your ear and the other to different parts non-moving parts of the engine compartment,including the engine to narrow down  the location of the noise. 

Posted on Dec 22, 2008

  • 7353 Answers

SOURCE: 2001 2.2 sunfire engine will start rattling after warming up

Timing CHAIN tensioner you mean? Better have that noise checked ASAP. It may be a problem with the timing chain.

Posted on Nov 02, 2009

wracefans24
  • 1985 Answers

SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm

you need to have the codes checked to know what direction to start repairs,Autozone does this for free

Posted on Jan 20, 2010

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