Check engine

MATTANDASH14

MEMBER
2003 AUDI A4
1.8L
4 CYL
TURBO
MANUAL
140,000 MILES

The check engine light is on (sometimes blinking). Got autozone to put the meter on it, says random misfire #2. I changed out the second coil pack, & the spark plugs. I also had to change the valve cover seal bc it was bad and oil was everywhere. Now, the car still idles rough, and check engine light is still on and also blinking at times.

Thursday, April 14th, 2016 AT 6:32 AM

1 Reply

CARADIODOC

MECHANIC
34,330 POSTS

You can tell the severity of the diagnostic fault code by how the Check Engine light acts. The most severe problems are when the light is flashing. That means stop the engine right away because too much unburned fuel is going into the exhaust system where it is going to burn in the catalytic converter and damage it.

Rather than replace random parts, a better approach is to swap the coil for cylinder # 2 with one of the other ones, lets say cylinder # 3, and the injector with the one from cylinder # 4. Erase the fault code, drive the vehicle, then see if a code sets for cylinder 2, 3, or 4. That will tell you if the coil, injector, or something else is suspect.

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Thursday, April 14th, 2016 AT 6:36 PM