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05-20-2014, 01:15 PM | #45 |
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I checked the gaps (2 electrodes per plug) on all of mine when I installed them. Two of the eight NGK plugs had one electrode with the gap too large by a few thou, but nothing unexpected for typical mfg. tolerances.
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05-20-2014, 06:15 PM | #46 | |
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05-20-2014, 08:58 PM | #47 |
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I see a lot of ppl change spark plugs every 10K miles
You should only do it if s65 is supercharged. I changed mine at 27k miles, and my plugs looked ok, didnt even feel any difference at all. Changing every 10k miles is a complete overkill IMO. Unless you are SCed of course. |
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05-21-2014, 07:51 AM | #49 | |
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At 27k, did you check the gap? Visibly ok looking plugs don't mean they're "ok" and not worn to some degree to lose some power.
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05-21-2014, 09:40 AM | #50 |
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I put my car on an every third oil change (22,500 mostly highway light throttle miles) schedule. I figure it costs $200 in parts doing it myself, $110 for the plugs and $90 for the coil pack I will inevitably snap the top off of with the puller. Last time it was #7
I did notice a difference in midrange after the last change so I think the ecu is less aggressive with timing as they age
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05-21-2014, 09:43 AM | #51 |
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05-21-2014, 09:51 AM | #53 | |
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05-21-2014, 11:12 AM | #55 | |
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Ever change a plug in a toyota aluminum head that has gone 100k on the plugs? <snap> is not uncommon.
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05-21-2014, 11:59 AM | #56 | |
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05-21-2014, 12:01 PM | #57 |
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I think you're right, my indie is a little proactive when it comes to these plugs and the S54/S62 plugs.
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10-29-2014, 05:13 PM | #58 |
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Engine runs rough after plug change
My car was running perfectly when I took it in for an oil change at 23K. Momentum changed the plugs while it was there and the car has run horribly ever since. I was getting motor shake to where it sounded like the pipes were hitting inside the tunnel. It threw an error code for #3 and the dealer replaced that coil pack. The motor shake went away and there has been no CEL, but the car stumbles off idle and is down on power to where it feels like it is running on only 7 cylinders. I took it back to the dealer but they could not find anything wrong with it and told me to come get it because there was no code to tell them what was wrong and they never would listen to me about all the things that I had read online about misfires. So I took it to my tuner who could not find anything wrong either because there was no code. So the tuner took the tune off, then put it back on, and then took it off again because the car still stumbled off idle. So I took it back to the dealer which is where it is now. The service foreman drove it and immediately could feel the stumble and said it was a misfire. But now my service advisor is telling me that his tech says it must have been something with the tune. But it ran like a top with the tune before I brought it in and the plugs were changed and the tune has been taken off, put on and taken off again and it still runs bad. This morning I told them to clear the adaptation values and then install the latest factory tune, but I have not heard back from them yet. What else can I do, should I try Advantage BMW? I have read everything I could find so if there is a link just tell me but don't call me a dumbass. Thank you.
Last edited by TXE90M3; 10-29-2014 at 05:15 PM.. Reason: Additional info |
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10-29-2014, 05:54 PM | #59 |
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TXE90M3: People used to troubleshoot engine problems before there were codes. Over-dependence on them is a problem. From reading this, it sounds like your problems began after a sparkplug change. The front six plugs can be changed in 30-40 minutes, might be worth doing. Check the gaps and keep the old plugs in case of no improvement. You could also buy one new sparkplug coil/cap and cycle it through one-by-one to see if the problem goes away.
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10-29-2014, 07:27 PM | #60 | |
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I bet they broke one of your coil packs during the spark plug change. |
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10-29-2014, 10:14 PM | #61 |
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Thank you for the advice. The car is still under warranty, so I will push them harder to go old school on the diagnosis. I do not think it is humanly possible to program a code a code for every eventuality, especially if it involves a partly failed component.
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10-30-2014, 10:15 PM | #62 |
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Yesterday the dealer replied that the tune needed to go back on for the car to run right. Then today they said the cats needed to go back on to clear the CEL. I am going over there first thing Friday morning to ask WTF, it ran fine without the cats, why would they need to go back on now?
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11-01-2014, 10:08 AM | #63 |
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Well, I may have put my foot in my mouth. I went to dealer on Friday morning and met with the tech. In speaking with him I am confident that they have tested everything and confirmed that the plug gaps, coil packs, etc... are correct snd working. The tech said he had seen this exact same thing before with another M3 with a tune on it from a non-major league tuner. So I have opted for the Dinan tune figuring it was on sale and that the dealer could not blame anything on the tune if they were not correct in their diagnosis. I will find out when I get the car back.
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11-01-2014, 11:08 AM | #64 | |
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Cheers Nik |
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11-05-2014, 02:35 AM | #65 |
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Just changed spark plugs at 33,000 miles, had my car supercharged 2,000 miles ago and I just started getting some nasty blowby/backfire engine power loss.
Took car for a nice drive after putting in the new ones and it was HUGE difference, smooth power/more power and no blam blam kblam! when I punch it lol. Got to say those back coil packs on each side are a pain, left off the spark plug covers as well to make it easier in the future since I got to change them so often now that im SC
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11-05-2014, 08:14 AM | #66 | |
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Changing those back coils and plugs is a big PITA, i agree. Not looking forward doing it, but with a SC, its every 10K miles |
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