Date registered: Apr 2005
Vehicle: 2002 CLK430
Location: Southern California
Mentioned: 2 Post(s)
Quoted: 3 Post(s)
No, it won’t stall and refuse to start. Not immediately at least. Your engine has knock sensors. When the knock that’s caused by low octane fuel is determined, typically Bosch systems will retard the timing and enrich the air/fuel mixture. Retarded timing and rich mixtures result in poor fuel economy, and reduced power levels. The long term effects of allowing knock to persist (if your knock sensors are faulty or the fuel is too cheap for the retarded timing to make a difference) are hammered valves and seats (corrected by a valve job) or, the always delightful holed piston (depending on the worth of the vehicle, that’s corrected by junking the car and starting over). In either instance, the false economy of saving $1.60 per tank becomes painfully obvious the owner. On the other hand, they did save a whole buck-sixty, which is almost enough to enjoy . . . . . uh . . . . . never mind that last point. A $1.60 won’t buy anyone anything.
If you’re asking because you use regular fuel AND your car constantly stalls and then won’t start, it’s probably caused by something else. How old are the plugs, the cap, the wires, and the air filter?
Last edited by MarcusF; 01-26-2007 at 08:49 AM.