please help me with this code, my car has ran fine for over a year now and as soon as a did an underside wash at the car wash i started it up and ran so bad, so i went home and scanned it and it threw p0300 multiple cylinder missfire. I know it has to do with washing the underside of my car because it ran perfect before with no codes and as soon as i washed it the ses light is flashing, please help!
coil? and what ignition connectors this sounds like it is what my problem is because I went to turn it over everything in the cluster lit up like normal but when i turned it over everything went blank, but if i wait long enough it will start, so what and where is the ignition connectors? thanks.
I would go thru the engine bay and unplug all large major connectors and look for water inside them. Definately check the crank position sensor plug if it wasnt working well could cause odd misfires. If you lost all power check the battery connections as well make sure they have a good connection.
I reset the code and dried everything out real good and drove it for five minutes and all was fine, we'll see if the problem happens again, this is the second time it has done this in two years. Weird.
Are your spark plug wires new, old, still the stock ones that came on the car? You might have some cracks in them that are causing your problem.
A little water isn't going to affect your spark plugs. If it runs fine now that it's dry you probably didn't blow a coil. Blowing out a coil due to water would be a secondary result of a bad spark plug wire.
I would be thinking about changing the plug wires myself.
2002 Navy Blue Metalic WS6 TA A-4. Born on 7-24-2002. I drive it every day.
My wires were fine when this happened. For me, the coil pack didn't click in all the way to the wiring harness and I was too tired to hear a problem after having been up for 27 hours (drove it home about 60 miles on 4 cylinders...yeah that was bad)
If the issue continues my steps would be
1. Check that coil pack is connected to wiring harness
2. Check wires are in good condition and tight
3. Check plugs are tight
4. At that point you may need to start replacing stuff, i.e. coils, plugs, wires.
Might as well look into as much as you can without spending money until you have to, but don't continue to drive it a lot if it's throwing those codes.
(07/01/11 - 08/12/2014): SOLD 1999 Firebird Formula A4: Stalled w/ Bolt Ons - 326rwhp 322rwtq tuned by Andrew at Complete Street
o2 sensors will not set a p300 code without setting a o2 sensor code.
did you ever replace your ignition wires? if so with what brand cause if its anything other than gm,msd or another higher priced brand your looking at about 1 year life span. plus the e3 plugs are prob the worst plugs you can buy on the shelf no offense. i worked at a advance auto for years through college (no im not the stupid **** they put behind the counter that doesnt know **** about cars). ive seen it ALL. get some msd wires and some ngk plugs and your miss fire will go away. unless you have 2 or more coil packs on their way out. but my money is on the wires even if you did do them not to long ago.
__________________ 2000 camaro, v6, auto, m90 supercharged, true duals, koni's/bmrs and misc other stuff.... low 13's. now that i can beat them im gunna join them