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Need help after changing spark plugs
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02-11-2018, 10:06 PM | #1 |
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Need help after changing spark plugs
Hi all,
Just DIY changed my spark plugs for the first time. I was getting a rough idle beforehand and thought this would fix it, but I may have screwed something up. I just got a pretty hard misfire after finishing the process, so I connected to Carly and got these two errors: Air mass meter, signal: electrical fault Code: 00277A Intake air temperature, electrical: short circuit to positive Code: 0029D0 This is on an E92 N55. Any help would be really appreciated! |
02-11-2018, 10:23 PM | #2 | |
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Looks like 0029D0 is misfire on cylinder 4 |
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02-12-2018, 12:04 AM | #3 |
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Does this mean I messed up the install on cylinder 4? BTW, I did notice some build up in the cylinders when I was changing out the plugs.
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02-12-2018, 08:19 AM | #4 | |
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Did you look at the plugs when you pulled them out? Based on the color and smell, you can normally tell what's wrong. |
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02-12-2018, 09:16 AM | #5 |
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Yeah I still have the old plugs, they look covered in carbon I guess. And the other code isn't a typo, that's the reading Carly is giving me
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02-12-2018, 01:54 PM | #6 |
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Make sure that your electrical connector is fully plugged into the coil. Don't rely on just the lever mechanism on the coil head to push the electrical connector fully in. Push on the back of the connector while closing the lever to insure it is fully seated.
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02-12-2018, 04:06 PM | #7 | |
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While I was at it, I was going to buy come MAF cleaner. I changed my oil at the same time, and I think I read somewhere that the filter can get oil onto the MAF somehow? BTW: I didn't clean out any of the carbon (I think it was carbon, definitely not oil) that I found in the cylinders. Should I have cleaned this out while changing plugs, or is this normal? |
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02-12-2018, 11:28 PM | #8 | |
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The carbon inside your cylinders is most likely from oil that has burned up during combustion leaving behind the carbon deposits. The most common source of this oil on our engines is the Positive Crankcase Ventilation (PCV) system that dumps crankcase oil vapor into the intake ports. This is why people install oil catch cans (OCC) on the PCV system. |
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02-13-2018, 06:44 AM | #9 |
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Also worth checking you didn't dislodge one of the electrical plugs to the injectors. I did that in error on cyl 6 when fitting new plugs and got a massive misfire!
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02-13-2018, 07:00 AM | #10 | |
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02-14-2018, 01:59 PM | #11 | |
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N55 does not have a MAF sensor ? what ? thats not true... ofcourse it does |
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09-23-2020, 05:56 AM | #12 | |
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help please !
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