Glow plug timer relay - 300tdi

In message , ChrisG writes

If the cloud really lasts for five mins then it will be nothing to do with the heater plugs!

I would be looking at valve stem oil seals or turbo.

Is that 10.5 open circuit or with the plugs in line? With plugs in I'd expect a voltage drop which may account for that but otherwise 10.5 seems low. I could on;y suspect a connection problem in the latter case, maybe engine to earth strap?

TonyB

.......And if it's just on start up only it's normal!! TonyB

In general terms (no 300tdi experience) it sounds fine - there's plenty of engines out there using glow plugs rated as low as 9 volts. If nobody else come sup with an actual voltage take a glow plug out and read what voltage is marked on it.

Have you measured the relay input voltage when the glow plugs are on? It may be showing 12V with the plugs off, but it will probably drop when the plugs are energised, due to voltage loss in the cables. If you realy are loosing 2 volts or so across the relay contacts then the relay is duff.

Nothing to do with glow plugs that mate! If it only does it for 5 minutes, and does not smoke the rest of the time, then you have no problem, pretty normal for a diesel engine.

It is only on startup, and the longer it sits the worse it is - but only ever a problem if the temp has dropped to 5 degrees overnight. I agree , valve seals are a strong possibility. At first theres enough smoke to cover a house, after about 1/2 mile its considerably better, after 5 mins its clean .

ChrisG

In message , SimonJ writes

Blue smoke for five mins is not normal at all for a 300 tdi.

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