▲ 6 r/mk6gti
Cold start problems
My MK6 has been acting weird, If i try to turn it on in the morning it just stalls, I gotta wait and try like for 30 minutes to make the car run. But this only happens in the morning, after 11 am my car starts normally .
u/legardasobelooo — 7 days ago
GTI MK6 cluster problem
I’ve got a 2012 MK6 GTI that’s been doing something really weird. Most of the time, the issue only starts after I’ve been driving for about an hour, but today it started happening immediately after a cold start. The cluster keeps rebooting, the door locks lock and unlock by themselves, the radio takes a while to turn on, the RPMs drop, and I get a bunch of random warnings like ESC, brake system, etc. The car is still drivable at first, but eventually it’ll stall and I have to restart it. Usually the problem goes away after cycling the ignition, but this morning it kept happening over and over. I already scanned the car and I’m attaching a picture of the codes. Battery voltage is 12.9V with the engine off and 14.05V while running, so it seems to be charging normally. Has anyone dealt with something like this or know where I should start looking?
Pd: the engine is running in the picture
u/legardasobelooo — 19 days ago
2002 Celica GTS (2ZZ-GE) - P0301, low compression on cylinder 1, very slow revving, possible clogged cat?
I've got a 2002 Toyota Celica GTS (2ZZ-GE, 6-speed) with 216k miles on it. Recently, the car became really weak and I discovered that cylinder #1 was oil-fouling its spark plug. After digging deeper, I found a broken valve in that same cylinder. So, I took the head to a machine shop where it got a rebuild, including a valve job and resurfacing, and they properly seated the valves too.
Post-repair, the compression in cylinder #1 shot up from around 20 psi to 120 psi. The other three cylinders are at about 160 psi. While the car is drivable now, it still pops P0301 and occasionally P0300 codes, and the spark plug in cylinder #1 is a bit oily.
Taking the car out isn't great; it hesitates when I accelerate from a stop, has trouble on hills, and revs super slow above 3000-4000 RPM. It sounds like the engine is struggling and makes this deep, muffled noise rather than the usual high-revving 2ZZ hum. Plus, there was this loud backfire from under the hood during acceleration.
All the coils, injectors, and timing have been checked already. Before the valve failed, the car was already running kinda sluggish, and once a few months ago, although it never came back.
What has me confused is that the engine doesn’t really smoke much anymore. It only smoked once on a cold start recently and then didn’t smoke again for the rest of the day. The engine bay also gets extremely hot after driving, and the car feels like it can’t breathe. If I floor it, it takes forever to get past 3000-4000 RPM, even in lower gears. It almost feels like something is choking the engine.
At this point I’m trying to figure out whether I’m dealing with a clogged catalytic converter, damage to the piston/rings/ring land in cylinder #1 from when the valve broke, or possibly both. Has anyone seen a clogged cat cause this kind of severe lack of power and slow revving on a 2ZZ? Would a cylinder with 120 psi compression and an oily plug really make the entire engine feel this weak, or does this sound more like an exhaust restriction? I’m considering removing the upstream O2 sensor as a quick test to see if the engine revs more freely. Any thoughts would be appreciated.
u/legardasobelooo — 3 months ago