406 diesel turbo ignition problems

Hi, Apologise for re-posting this, but I didn't get any response first
time round?

I've just returned from a trip tp South of France, and since I've got
back I've noticed a problem with the glow plug light taking longer than
usual to go out when I start up and engine takes
a while to "catch" on cold start, and the exhaust blows out a plume of
black smoke on
ignition. The glow plugs were replaced a couple of months ago and
everything was going fine before the trip (although I did notice the
black exhaust in France after the journey down). Has anyone got any
idea what the problem might be?


Any help appreciated.


Thanks


Paul

 

First of all, make sure all the glowplugs are actually working. Did
you fit Peugeot ones? Then disconnect the feed wire to the plugs and
see if the time on is the same. You may need a new control box
(adjacent to the battery).

 

Check with a bulb that there is a voltage at each of the glow plugs when
they are heating. This should be present for about 20 secs after the
ignition is turned to start the car.
This will prove the glow plug relay and the connecting wiring to the plugs.
Make you contact on the thread of the plug not the wiring spade terminal to
eliminate dirty contacts here.
Each glow plug should draw 12 amps aprox when working. With a clip on
ammeter you can look for 48 amps when starting. This will prove the glow
plugs.
If you dont have a clip on meter disconnect the lead to the glow plugs and
place an in line ammeter here again you should be measuring about 48 amps.

You went on a trip to Fance you may have had dirty fuel and got a lot of
soot around the glow plug preheat chambers. Would be worth running some
injector cleaner through the system
Mike

 

Mando
It may also be worth checking the battery voltage when using the glow plugs
and cranking the engine.
My 406 1.9 TD had a sudden battery failure today when it went down to 10 V
it has been producing some black smoke at start-up this week for the first
time.
Mike