My 3.8 has always had a slow idle compared to the 3.6 I had previously. It idled just under 1000 RPM, but the 3.8 runs slightly below the 750 RPM mark, and hits 750 with AC on. Occasionally it dips to about 600, but settles a little higher when blipping the trottle.
Since having read about weak batteries causing slow idle, I had a look at it and changed the non-stock battery which had a too low Ah-rating to a Porsche (!) battery (simply because my cousin had got it from someone, and gave it to me) which was about 80-85 Ah and performed well with a battery load tester, but the idle was exactly the same as before. Is it still likely to be an electrical problem (alternator/bad contact etc) causing this slow idle? I have at least never seen the battery charge warning light come on...
Could this idle speed be bad for the engine in any way, or maybe it doesn't matter? The engine never shows any tendency to stall when just idling, but the 3.6 was nicer to launch from standstill since the engine is quite strong already around 1000 RPM. I think the idle is pretty smooth to be an M5, just a little "weak" since running slow.
Well, maybe I'm just having to much spare looking for troubles ouich , but it's always nice to know the beast is ok.
Since having read about weak batteries causing slow idle, I had a look at it and changed the non-stock battery which had a too low Ah-rating to a Porsche (!) battery (simply because my cousin had got it from someone, and gave it to me) which was about 80-85 Ah and performed well with a battery load tester, but the idle was exactly the same as before. Is it still likely to be an electrical problem (alternator/bad contact etc) causing this slow idle? I have at least never seen the battery charge warning light come on...
Could this idle speed be bad for the engine in any way, or maybe it doesn't matter? The engine never shows any tendency to stall when just idling, but the 3.6 was nicer to launch from standstill since the engine is quite strong already around 1000 RPM. I think the idle is pretty smooth to be an M5, just a little "weak" since running slow.
Well, maybe I'm just having to much spare looking for troubles ouich , but it's always nice to know the beast is ok.