Hello All,
2002 S60 T5, 150 K miles. Car came with a lite tune of local origin.
In the Netherlands we have ££££ty gas, base is 95 octaan and then to get to 98 additives are used. One of the few imported original 98 octaan gasolines (assumed through several forums) is BP Ultimate. I thus always get BP Ultimate. For a while I have suffered a minor issues at idle, the car will idel fine and then drop a beat somehow... as if it wants to stall...but only very briefly and it never actually stalls...well the engine doesn''t, my heart almost every does.. :-)
The other day I ran low and stopped at a Gulf station, they advertise something called Challenger, I went inside and asked if that was a 98 octaan. The boy at the cashregister said that it used to be a 100 octaan but the had understood that by now it was also a (souped up 95) 98. So I filled up.
After driving for a while I noticed that he sound of my engine quieted down, idle was stronger and the dips during idle were much softer or not there at all. RPM''s above 4000 where less noisy also. It didn''t have the kick on full throttle but boost built up nice to 17 psi anyway. Drove around for 2 days wondering whether this challenger is not a near 98 octaan (97 octaan such as the shell V power is in the NL) and that the lack of heavy kick in the but was caused by a less aggressive advance ( or retardation) of the ignition, driving on a lower octaan fual then before. To test this I bought a wynns octane booster and added the bottle to a half full tank... drove around for a bit to give it time to mix with the gas and to let the ignition get used to it....didn''t really feel any difference but the idle drop is back...with a vengeance.... nice steady idle and the for 1 second a heavy drop and near stall.... more aggressive then before.
Does this sound like ignition behavior? Or familiar to any one at all? I thought that our T5''s really liked as much octaan as possible....whereby 98 octaan can not really be considered something special....I have fairly new candles (Volvo original) new coils (IPD heavy duty) and the ETM has been cleaned recently.
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