The problem started yesterday out of nowhere. 03 GTI, pretty much stock. I drove to work yesterday with out any issues, but after work, before I was even out of the parking lot I noticed the idle was rough. Ive had ignition coils go out, and that as my first assumption.
As I accelerated out of the parking lot, the car was pretty jerky and hesitant, and then I noticed the CEL was blinking. Checked it out when I got home, and I have 3 new codes, PO300 - Random/multiple cylinder misfire. Misfires are on 1 and 4. I switched coils 1 and 2 and erased the codes to see if the coil was bad, started it up, and same thing, misfires on 1 and 4.
Im pretty new to this engine and its a newer car than Ive ever owned. Most of the info I found was in the 1.8T forums, and usually pointed to software issues or vacuum loss, but all the info was vague or directly related to the 1.8T.
Could anyone offer me a little direction?
I just replaced the spark plugs and still no luck. I had tried unplugging the battery before as well thinking it might be an ECU problem or something that might reset.
I honestly dont have the slightest clue this time around. Im puzzled how it just randomly started upon a startup with no prior issues.
Well guys sorry for being in and out of here. I had originally swapped the coils and reran the codes and was still getting misfires the same cylinders. I later checked manually by unplugging them and found 2 bad coils. So I replaced them and was good for a few days. Now today I start her up and have 8 faults.
doesn't seem to be running as rough, but is still pretty choppy. I'm looking for a little more insight before I get home in the morning
Sometimes i get missfire codes on my supercharged GTI, and while i replaced new coilpacks and pugs i would still get it sometimes, it happens when Im at wot, cel would blink but go away aftet a few seconds.
Now, my theory is, my timing its advanced at 1.25 degrees and while on despot 91 oct. It runs lean, or its my lwfw, giving false load reading to the ecu. I asked Jeff from at that time C2 motorsports and he asked me if i had lwfw, and that it would give ecu false load reading or someting like that, cant remember.
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