What kind of pop? Where's it coming from?
Hey,
I got a 540i... it makes a "Pop" sound upon startup... well... 4 seconds after startup. It will only do this after extended shutdown... like first thing in morning... or hours after you come back from work to start it up.
What can it be? Ignition coil in oil?
What kind of pop? Where's it coming from?
Only mine makes a "pop" or couch upon first crank or so on a cold start. If you hold key on it will go ahead and start. Seems as if the sound is near the induction system airfilter area. It seems random.
Originally Posted by Tiger
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment
it sounds exactly like there's an ignition coil in oil or at least a bad boot in oil. can you smell anything when it does the pop? i'd leave the vents on open and take a smell (inside and out) when it does it.
In the hood area... I was never there when started...
you'd do well to get the person driving it to smell, i guess. always gives off a kind of ozone mixed with lit match put to motor oil smell if it is oil on coil.Originally Posted by Tiger
could be a vacume leak or a coil/boot/plug issue. I would do a visual inspection of the electrical end, read the plugs to see if any are a little different. Do a careful inspection of the intake system too. It could be intake gaskets too but Id go electrical first.
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Intake gasket was done by BMW not that long ago...
it was done right! start with the plugs and stuff.Originally Posted by Tiger
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy
Of course, they could still be leaking. Almost time to change plugs again. This time I was going to check plugs as an indication that coils and connector could be bad. I have has an idication of misfire with ssome fuel dilution issue on used oil analysis.
BTW, several of the previous plugs has a touch of oil. The previous owner never changed the plugs in 76,000 miles. They only followed the SI lights and fix things when they were broke by BMW dealers. The POP is random on my 525i and only on long soak starts.
Thanks
Originally Posted by ryan roopnarine
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment