Perkyp

Is it like a violent jerking back and forth while not picking up much or any speed? Does it backfire like crazy at this point to?

Similar to what I had mate and it turned out to be blown headgasket. Could be the thermostat if you are lucky, but get the test done for gasses in coolant before spending any money!

I recently had overheating and loss of coolant, not a major amount but noticeable. No milky oil either! Rad hose blew off to while testing. Turned out to be blown headgasket unfortunately caused by age deteriation, dodgy thermostat and a notchy water pump.

Cleaning the maf again wont fix it. Just had the same issue on my hawkeye. Reading the maf with a proper tester not just a scanner will most probably show an irregular reading. Test dont guess!

It turned out to be a failing maf sensor which didnt throw any codes and 2 small boost leaks!

Thanks for the reply. Yep have reset the ecu. A strange thing with the plugs is that when I purchased the car it had just been serviced and ran perfectly fine until the next service. When pulling out the plugs they were the shorter plugs for the 2.0 engine which was odd. I checked a few specialists which explained they should be the long reach plugs for the 2.5l so put them in and they came out white after 3k. I have tried the short reach again but same problem still persists. When the short plugs were removed they were no where near as white after 5k miles. I believe this is a seperate issue unrelated to the problem now but still confused by the plug choice. I have found a video which shows an exact copy of my issue which is coil packs, so that is the next test. Any feedback for the plugs also will be greatly appreciated

Hi guys I have owned my impreza sti since december last year without performance issues. A couple of weeks ago the eml came on for front o2 sensor. After checking and clearing the code I now have jerking and hesitation around 10psi and a large loss of power but then goes to 20psi but feels shakey and still low power. Both sensors were changed and still the same but no eml. Spark plugs were inspected and show alot of white on the tips, they are only 3k miles old. Compression shows 135 on all 4 cylinders. I found a hole in the turbo inlet hose which I changed for a mishimoto silicone hose. Still having same issues along with overheating after a long run. Head gasket test was done and did not change colour. Vaccuum is stable at just over 20inHg. It has a decat exhaust, and valve delete and should be hittin around 350bhp. Please can someone help with this we are running out of ideas and I have searched everything!