» Site Navigation | | » Recent Threads | | 1999 M3 Swap 09-07-2023 10:10 PM 05-02-2024 08:18 PM 6 Replies, 405,290 Views | | | | | 01-27-2018, 11:52 PM | #1 | Junior Member Join Date: Apr 2017 Location: Maryland Posts: 27 | Misfires So I have been dealing with some misfire codes on all cylinders recently. The car has always had some minor engine rough idle, although the rpms are steady. A new valve cover gasket was put in, a module for the spark plugs, the only other thing I can think of is the spark plugs. But the ones in there aren’t that bad. Never had a ck engine light come on till today. And sure enough it says misfire in 1,2,3,4. Any ideas?? Sent from my iPhone using Tapatalk | | | 01-28-2018, 01:39 AM | #2 | Senior Member Join Date: May 2013 Location: Seattle Posts: 513 | Vacuum leak? Have a look at intake boots, Sap stuff, then hoses under intake manifold. Spraying brake cleaner in spots and listening for revving may work to find a leak too. | | | 01-28-2018, 03:03 AM | #3 | Junior Member Join Date: Apr 2017 Location: Maryland Posts: 27 | Quote: Originally Posted by BRADESTAR Vacuum leak? Have a look at intake boots, Sap stuff, then hoses under intake manifold. Spraying brake cleaner in spots and listening for revving may work to find a leak too. | Thanks man, will ck it out. I thought I did a good once over but will go back. Guess it was enough to throw a ck engine light. Sent from my iPhone using Tapatalk | | | 02-02-2018, 06:14 PM | #4 | Junior Member Join Date: Feb 2018 Location: Houston Posts: 12 | It could be a Camshaft Position Sensor. These tell the ECU when to fire the injectors and spark plugs in relation to where the intake camshaft is in the four cycles of engine operation. A bad one will not be able to time the components properly and eventually blow the engine because none of the parts are firing in the correct sequence. | | | 02-03-2018, 02:04 PM | #5 | Junior Member Join Date: Apr 2017 Location: Maryland Posts: 27 | Quote: Originally Posted by SlowBimma It could be a Camshaft Position Sensor. These tell the ECU when to fire the injectors and spark plugs in relation to where the intake camshaft is in the four cycles of engine operation. A bad one will not be able to time the components properly and eventually blow the engine because none of the parts are firing in the correct sequence. | Did not think to ck that, of course I’m pretty new to these cars. Need to see what that looks like on line. Thx for the tip Sent from my iPhone using Tapatalk | | | 02-03-2018, 02:33 PM | #6 | Junior Member Join Date: Feb 2018 Location: Houston Posts: 12 | Quote: Originally Posted by newto318 Did not think to ck that, of course I’m pretty new to these cars. Need to see what that looks like on line. Thx for the tip Sent from my iPhone using Tapatalk | It's the black sensor right on the from of the engine just below the valve cover. It's not too hard to replace, just remove the top intake manifold and unplug it basically. New ones are a bit expensive but replacing a cylinder head is even more expensive. | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |
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