DWEBB

Garage diagnosed problem as cylinder head gasket faulty. Allowing combustion gasses to flow into coolant system - hence bubbling coolant from startup in expansion chamber. I'll post a further note as to the cost and effectiveness of the repair. Would still like to know if Bosch spark plugs are gonna give me trouble and should the gap be reduced by 0.2mm because of the LPG conversion. Just to finish, apart from all this hassle, LPG is brill at 29.8p per litre!!! No change in performance at all.

I'm the unfortunate guy (see below coolant problems) who had my car 'serviced' with non Lexas garage last week. Car has gone back to same garage today because was undrivable due to previously described problem. The car was already booked in to have the new sparkplugs re-gapped. The garage fitted Bosch 'equivalent' (do I hear someone groaning!!!) spark plugs. After fitting and servicing, they noticed that my GS300 had a LPG gas conversion (2/10 for observation). They said that the car would have to be booked in again to have the spark plug gaps reduced by 0.2mm. So this is what is planned for today. Are the Bosch plugs suitable? Do they need to be re-gapped for gas? Any links between above and the coolant fault? Dave Webb

Got a problem with MK1 GS300. Coolant levels changing in expansion chamber and stream of 'bubbles` in the chamber from startup. This bubbling gets worse after few miles and is audible after parking up. Expansion chamber has just overflowed last night after short trip. Water not boiling, not steam as measured temperature. Engine temperature sometimes rises when idling. New radiator fitted recently and system pressure tested no problems. Above symptoms only started after service by non Lexus garage. Spark plugs, oil, air filter, starter motor changed. Coolant was low when I collected car. Mechanic said that a water pipe had to be disconnected to gain easy access to starter motor???!!! Are we talking head gasket here with gas entering coolant system? Or air lock? Any help would be appreciated.