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#1
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2002 SC2 noises
2002 SC2 manual transmission
When I start the car after it sits for a while, I get this brief clunking sound as I start to drive either forwards or backwards (most noticeable in reverse or whenever I don't give it much gas) . After maybe 30 seconds to a minute of driving it goes away. Any ideas? Thanks. |
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#2
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2002 SC2 noises
Does the sound happen then stop or does it continue for 30 seconds?
If it just happens for a moment, it could just be the sound of the ABS cycling - it does it every time you start the car. If it is continuous, it is likely somthing else. wrote: > 2002 SC2 manual transmission > > When I start the car after it sits for a while, I get this brief > clunking sound as I start to drive either forwards or backwards (most > noticeable in reverse or whenever I don't give it much gas) . After > maybe 30 seconds to a minute of driving it goes away. > > Any ideas? Thanks. |
#3
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2002 SC2 noises
No ABS. It continues and changes speed with the motor. It is not a
shuddering, lugging sound like trying to start out in the wrong gear, just most noticeable when in gear and rolling at or near idle RPM. It is also not a rock in the tire or something like that - most definitely a mechanical clunk. The motor also always has some of what seems like valve train noise, but that is there even when the car is warm. I have heard that an exhaust leak can sound a bit like "lifter noise" and it makes sense that it would get louder under load, but not that the deep clunk would go away quickly. I suppose thermal expansion could seal it somewhat... Oh well, I am bringing it in and I guess we'll find out. Cross your fingers. RangerRover wrote: > Does the sound happen then stop or does it continue for 30 seconds? > If it just happens for a moment, it could just be the sound of the ABS > cycling - it does it every time you start the car. If it is > continuous, it is likely somthing else. > |
#4
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2002 SC2 noises
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#5
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2002 SC2 noises
Dealer Diagnosis: Piston Slap
Recommendation: Do nothing, it is normal for the car. Idle car for a while until it lessens, then drive at low RPM's until warmup. |
#6
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2002 SC2 noises
A thought occured to me. I wonder if the "rattle" caused by this would
affect the knock sensor, causing the timing to be retarded under acceleration, and be the reason the car seems to have a bit less pep than my '96? Where is the knock sensor(s) mounted? |
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