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      10-21-2019, 09:11 AM   #1
coldfish
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what is right gap for stock spark plug on ZCP

Hi,

Can someone confirm the right gap for stock Borsch ZMR5TPP330 spark plug on ZCP 2018 F80 M3 ?

I measured mine and they are 0.030-0.031 from factory, which seems to be too wide since I heard someone saying the standard gap for stock car should be 0.028, and my car is sputtering when cold start, only 7000km on mileage, car running good after warming up but the misfiring on cold start really bothers me.
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      10-21-2019, 09:34 AM   #2
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028 is the correct gap. My guess though is that the gap is not your problem. What was the condition of the plugs? Are you getting any codes? Has this happened across multiple tanks of fuel?
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      10-21-2019, 10:55 AM   #3
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Quote:
Originally Posted by Kev608 View Post
028 is the correct gap. My guess though is that the gap is not your problem. What was the condition of the plugs? Are you getting any codes? Has this happened across multiple tanks of fuel?
The plugs look fine and no code so far. Now, I move my car immediately after starting, so that the car wont have much chance to sputter. Once it is warmed up, no issue. Idling is smooth too. But if I leave it there and wait for 30s, it definitely feels not right, I can hear the exhaust "coughing".... it will become normal after cold start ends and RPM drops. So I guess it only happens in enrichment circle and when the plug is cold.

I tried both 94 and V power 91, no difference.
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      10-21-2019, 11:24 AM   #4
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Definitely sounds like plugs. Try to gap them down to .028 and see if that solves it.
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      10-21-2019, 11:38 AM   #5
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Quote:
Originally Posted by Kev608 View Post
Definitely sounds like plugs. Try to gap them down to .028 and see if that solves it.
Yeah, going to try that.

I actually tried NGK 97506 for a while, gapped to 0.022. It solved my cold start issue but still has intermittent misfire counts under mode06 report, about 20 counts across all cylinders after 2 hours highway driving.

I will see if re-gapping the stock plugs would solve my issue. Finger crossed..
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      10-24-2019, 06:58 PM   #6
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Quote:
Originally Posted by Kev608 View Post
Definitely sounds like plugs. Try to gap them down to .028 and see if that solves it.
Only cylinder 4 had misfire at cold start (30 counts in 2mins). After re-gapping all plugs to 0,027, cylinder 4 still had misfires but with much less counts (7 counts in 2 mins). Then, I replaced the cylinder 4 plug with a new stock plug. Issue solved (0 count) .

It seems that the quality of these Borsch plugs is not very consistent, all my 6 plugs were just replaced at dealer 2 weeks ago, however, it does not affect the car's performance after cold start.
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      10-24-2019, 07:22 PM   #7
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Quote:
Originally Posted by coldfish View Post
Only cylinder 4 had misfire at cold start (30 counts in 2mins). After re-gapping all plugs to 0,027, cylinder 4 still had misfires but with much less counts (7 counts in 2 mins). Then, I replaced the cylinder 4 plug with a new stock plug. Issue solved (0 count) .

It seems that the quality of these Borsch plugs is not very consistent, all my 6 plugs were just replaced at dealer 2 weeks ago, however, it does not affect the car's performance after cold start.
Happy to hear you solved it! If you aren't under warranty, I'd suggest going with NGK next round.
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      10-24-2019, 09:35 PM   #8
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Quote:
Originally Posted by Kev608 View Post
Happy to hear you solved it! If you aren't under warranty, I'd suggest going with NGK next round.

I tried NGK a while ago, but I found black spot on the white insulator.

https://f80.bimmerpost.com/forums/sh...php?p=24828080

Mine look exactly the same as his. Only about 3000 km on my NGKs. so I decided to go back to stock plugs.

I did some research. the black spot is probly towards the intake valve, getting hit by the air/fuel mixture. Since NGK 97506 is colder, it is eaiser to have carbon build up, plus iridium(NGK) runs colder than platinum (stock plug)

NGK 97506 will be better if you track the car heavily or add more boost to the car. As a daily driver like mine, I feel stock plug is the best.
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      10-24-2019, 10:27 PM   #9
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A lot of knock off plugs out there. Could be the issue
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      10-24-2019, 10:49 PM   #10
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Quote:
Originally Posted by BzsBimmer View Post
A lot of knock off plugs out there. Could be the issue
Where would there knock off plugs be sold?

I just bought some ngks from FCP euro. Hopefully it won’t matter there!
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      10-24-2019, 11:52 PM   #11
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Quote:
Originally Posted by BzsBimmer View Post
A lot of knock off plugs out there. Could be the issue
all my plugs are from BMW dealership, including NGK 97506 which BMW actually has it as plug for some car.
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      10-25-2019, 01:09 PM   #12
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Quote:
Originally Posted by jpy1980 View Post
Where would there knock off plugs be sold?

I just bought some ngks from FCP euro. Hopefully it won’t matter there!
Amazon and even some well known online auto retailers
There’s a thread on here highlighting how to tell.
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