How I got there:
1. I drove through a puddle of water. The check engine lights came on and smoke/steam came from the engine. The engine would start but it wouldn't idle well and or generate power to drive.
2. Diagnosed that water would have gone in certain parts (air inflow/radiator) which was causing misfire. I let the car sit and dry for a few days. And then started it again.
3. Check engine light was still there but the engine seemed to be working fine. Codes: P0300-P0306.I reset the codes and drove the car back home. I noticed a few misfires on my way.
4. Replaced the spark plugs. The engine works perfectly. I drove it for a few days. Engine seems to sound better, even better than before the puddle incident.
5. After a few days, P1399 comes up. Check engine light did not come up. And the car runs fine.
Reading online (Possible issues): Fuel injector, valve adjustment
How do I diagnose the issue properly? What are your suggestions?
@alpha_beta
as your car runs good you dont need to worry about it. something else is making you get different codes. most of the time you dont get codes at all or error faulty codes. its easy to check for fuel injectors, you can use a multimeter and check the resistance. find it on youtube. valve adjustment should be done every 200,000 miles. what has helped me troubleshoot my car easy , is by cleaning all my electric plugs with electric spray cleaner. clean all your sensors with the correct sensor type. you will see a different right away. also perhaps you put a brand new part and your car computer is having a little trouble accessing new memory, i removed my computer, put it back and even cleaned it, car runs like new no issues
Thanks @reddevil1321
I will start with cleaning the electric plugs and checking fuel injection. Any recommendations for product of youtube video?
I for got to mention that the car garaged for about 2 years before I started driving it 4-5 months back.
Another update.
I was monitoring the error codes everytime i drove and suddenly I don't see P1399 anymore. That makes me happy. But does this suggest that electric plugs are not clean or were the spark plugs not installed properly?
Since the car was sitting in garage for a long time, i suspect it is the cleaning. @reddevil1321 Any suggestions?
@alpha_beta
the computer needs to access every single part back and forth and gives signals every second every minute. if youre cables did not got wet during that puddle of water that is one less problem, wet cables or a wet computer is a NO. the computer should only be disconnected safely with a battery pack that scotty reccomends and hook it to the obd, thats when you have a fully working vehicle since the computer needs to programs hundreds of stuff simultaneously. iam posting youtbe links from scotty kilmer channel. the root problem is almost always an incorrect adjustment an incorrect computer issue, wich by the way the alternator should always be checked and since you had it 2 years garaged kept and then you went through a puddle of water, chances are your alternator got wet and thats where you should start. also youre battery and alternator work as 1 and communicates alot with your computer,. so just put " your computer is the keyboard, your alternator is your display, your 12v battery is your power source", so dont choose a category to label a computer, every other part is as important. iam 100% sure you have weird random electrical problems, unless you get codes then that makes youre life a littl bit easier. the last video shows you how to do a Parasitic Draw test by Scotty Kilmer. this will be a very good start to troubleshot your car Safely, so dont jump into buying or replacing parts, your electric system has to work. water can do the most damage specially if watter was sucked inside the cabin air filter
https://www.youtube.com/watch?v=vpag_Rf3aBE
https://www.youtube.com/watch?v=-eb244DpjGY
https://www.youtube.com/watch?v=XN4GSRObmBA
https://www.youtube.com/watch?v=Rf572ZVWZY0
https://www.youtube.com/watch?v=hKo5iJ2rH7o
@alpha_beta
i also want to add that 12v battery have small air vents, if you garaged kept for a long time, your chemical fumes have evaporated out of the vents, this will results in less power and random strange codes that probably dont exist. you get code one day another day no codes. please keep us informed of your diagnostics.