a leak in a head gasket could cause coolant to go into only one cylinder.
Bad Plug or coil pack.
Trust me your 1/4 coil is junk. you dont need all three
Any sudden brake loss can be the cause of 1. brake line damage 2. master cylinder disfunction
under cylinder #1 intake runner in the cylinder head apparantly is a PITA to get to might have to take the intake manifold off
Bad plug? Bad wire? Bad piston or valve (do a compression test)
I had the same problem on my car. turned out to be a blown head gasket. the no. 1 cylinder was pushing hot gasses into the coolant jacket.
well one thing i would cheak is you muffler it could be leaking out there if so you have a craked block --- I had a '93 Passat with a bad head gasket. The water was leaking into cylinder #1 and evaporating into the exhaust, completely bypassing the oil. The VW mechanic said this was not uncommon. The car passed the coolant pressure test, but when the mechanic pulled the spark plugs he could see the coolant in the cylinder using a flashlight.
The top uppermost cylinder would be the no. 1.
This is listed in your owners manual. Purchase 1 gallon of the correct antifreeze and 1 gallon of distilled water. Mix them 50/50 and this should be enough. Or purchase 2 gallons of premixed coolant.
I WOULD LIKE TO GET AN ANSWER ON THESE DETAILS ABOUT AUDI A4 1.8T 1 = REPAIR PRICE IN SOUTH AFRICA ON CYLINDER HEAD GASKET INTAKE AND OUTTAKE VALVES AND ALL THE FAN BELTS ? I WOULD LIKE TO GET AN ANSWER ON THESE DETAILS ABOUT AUDI A4 1.8T 1 = REPAIR PRICE IN SOUTH AFRICA ON CYLINDER HEAD GASKET INTAKE AND OUTTAKE VALVES AND ALL THE FAN BELTS ?
Cylinder #1 would be the one closest to the radiator.
It means that more than one cylinder has a misfire history. PO301 would be cylinder number 1 misfire. PO302 would be number 3 cylinder misfire.