Well, as I said in my other topic: My engine management light comes on. It goes a little like this: light flashes -> 40 miles later it flashes again -> 15 miles later it stays lit. When I delete the codes via OBD2, the cycle repeats itself about every 1000/1500 miles. The codes I get show misfires. Always the code for a random misfire and sometimes misfires in cylinder 1 and 4 and sometimes the faults rotate to misfires in cylinder 2 and 3. I can't really feel the engine hesitating.
Things that have been done: replaced spark plugs and changed gap to 0,6 mm, changed all 8 coils, changed knock sensor, adjusted the valves, cleaned EGR valve, replaced air filter (and interior filter, engine oil, oil filter and wheel bearing, but that shouldn't matter) It has cost me 1000 euro's so far. The problem is not solved.
So I thought, cleaning the MAF couldn't hurt. But I don't have a MAF. So I was looking for a way to clean the sonsors responsible for vacuum. I hope my story makes sense