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M-Series (M1, M3, M5, M6) General M-Series Discussion - If it does not fit into a more specific M Category above, please place it in here. In addition, previously archived M-Series discussion is located in this section.

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Old 10-22-2004, 11:43 AM   #1 (permalink)
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I've got a problem with my 1995 30L M3 in that at low speeds high torque situations, ie climbing a steep hill neer me with speed humps the size of small mountains on it, I get a very unplesant "Pinking" noise from the engine. I know this could be in the worst case cenario "piston slap" and an enginr ready for a re-build but at only 87,000 mls this should not be the case as yet. Iv'e checked for air leaks pre air volume meter, can find none and the check engine light is not lit and never has been.

Any ideas anyone?

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Old 10-22-2004, 03:45 PM   #2 (permalink)
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OBD1 cars do not deal as well with pinging as OBD2 cars.

What Kind fo Fuel are you using ?

Our cars have something called a knoc sensor, its a microphone that picks up these "knockign sounds" and when its picks it up it lets the computer know and reduces the power and screws up the timing.

Also, do you have a performance chip in your car? if so which one ?
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Old 10-22-2004, 05:34 PM   #3 (permalink)
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Quote:
Originally posted by M3WKY@Oct 22 2004, 10:43 AM
I've got a problem with my 1995 30L M3 in that at low speeds high torque situations, ie climbing a steep hill neer me with speed humps the size of small mountains on it, I get a very unplesant "Pinking" noise from the engine. I know this could be in the worst case cenario "piston slap" and an enginr ready for a re-build but at only 87,000 mls this should not be the case as yet. Iv'e checked for air leaks pre air volume meter, can find none and the check engine light is not lit and never has been.

Any ideas anyone?


[snapback]216176[/snapback]
What happens alot of times is your combustion chamber gets all "carboned-up". I recommend using a product called "seafoam". Just make sure you read the directions carefully.
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Old 10-23-2004, 07:06 AM   #4 (permalink)
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Quote:
Originally posted by ///M3 FX@Oct 22 2004, 09:45 PM
OBD1 cars do not deal as well with pinging as OBD2 cars.

What Kind fo Fuel are you using ?

Our cars have something called a knoc sensor, its a microphone that picks up these "knockign sounds" and when its picks it up it lets the computer know and reduces the power and screws up the timing.

Also, do you have a performance chip in your car? if so which one ?
[snapback]216291[/snapback]
useing shell Optimax with a min octane rateing of 98.

My car has these Knock sensors too, and they should if faulty, bring on the engine check light.

just orderd from your neck of the woods a fault code reader, so maybe that may help. I know I can read on a pre 1996 model useing the trottle pedal but thats way too fidley.

Actually hopeing it does show a fault with a sensor or somethin cos that sounds cheaper than the re-build option.

will try some fuel addatives after that, see if that has any affect.

Not had car since new so don't know if it's been chipped or not, (is there an easy way to tell)?

Thanx for your reply.
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Old 10-23-2004, 04:33 PM   #5 (permalink)
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Quote:
Originally posted by M3WKY+Oct 23 2004, 06:06 AM--><div class='quotetop'>QUOTE(M3WKY @ Oct 23 2004, 06:06 AM)</div><div class='quotemain'><!--QuoteBegin-///M3 FX@Oct 22 2004, 09:45 PM
OBD1 cars do not deal as well with pinging as OBD2 cars.

What Kind fo Fuel are you using ?

Our cars have something called a knoc sensor, its a microphone that picks up these "knockign sounds" and when its picks it up it lets the computer know and reduces the power and screws up the timing.

Also, do you have a performance chip in your car? if so which one ?
[snapback]216291[/snapback]
useing shell Optimax with a min octane rateing of 98.

My car has these Knock sensors too, and they should if faulty, bring on the engine check light.

just orderd from your neck of the woods a fault code reader, so maybe that may help. I know I can read on a pre 1996 model useing the trottle pedal but thats way too fidley.

Actually hopeing it does show a fault with a sensor or somethin cos that sounds cheaper than the re-build option.

will try some fuel addatives after that, see if that has any affect.

Not had car since new so don't know if it's been chipped or not, (is there an easy way to tell)?

Thanx for your reply.
[snapback]216615[/snapback]
[/b][/quote]


Does it have a rev limiter. Where you the first owner? usually its beacuse a previous owner decided to use less then 91 octane which is why it was doing it. However if your car is chipped the chipped cars have been known to have this problem alot more then others. Dinan and JC chips have offered to customize your chip to minimize the ticking sound.
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