HI Chaps. So riddle me this.
I've a 2003 Renault Laguna 2 dci(120). About 50k on the clock. Mechanically sound, starts and runs just fine- has done since I bought it two and a half years ago and all regular servicing done by me.
Just for kicks, last night I went out into the garage and put my multimeter across the glow plugs. Every one of them was open circuit. Took a couple out- sooty on the end but mechanically solid. Checked again- open circuit. As sanity check put them across a battery- nothing.
Bought a set of plugs (NGK was all the shop had) this morning and checked them out before I slapped them in. Half an ohm, nice cherry-red tip when put across the battery. Now installed.
So, revelation. With four defective glow plugs, how come the car started fine- even when left outside to freeze in the snow recently, and threw no idiot lights on the dash. I know direct injection needs less heating than indirect, and that heating on this machine is three phases for emissions and cold drivability, but I am flabbergasted it has worked reliably as is. Any thoughts?
Rich.