1995 306DT Bosch FI Pump

Hi

After having changed glow plugs, air filter and fuel filter (filter filled
with injector cleaner before boxing up) my 306 is running fantastically
well again and I would defy anyone to tell it has done 175K on a blind
hearing of the engine. However a small niggle still remains - on starting
from cold the engine misses slightly and gives a puff of smoke then settles
out after 5 or 6 seconds (quicker if it is revved slightly). I am confident
all the glow plugs are working OK (genuine Citreon/Peugeot ones). A
workmate has suggested it could be as simple as the cable needing adjusting
on the fast idle speed. Is this a good way to progress?

Jim

 

workmate has suggested it could be as simple as the cable needing

Might be cold start setting (needs to be done when engine is stone
cold-leave it with the man overnight).
White smoke? Unburned fuel, would usually indicate duff glowplug. Guess one
in four could be a bit iffy.
Try giving it two sessions of preheat before starting (not recommended as a
regular feature-it can harm the glowplugs apparently).
DaveK.

 

It wasn't anything to do with that - fast idle thermostat working fine -
revs around 1050rpm cold, 900 hot.

Is there another setting apart from the fast idle to aid cold starts?

Jim

 

From memory, yes there is an electrical device on the pump which alters the
injection timing when cold. the wires to this are on the front, going to the
drive end. Don't confuse with the stop solenoid.
What method do you use to start from cold? I always pu my foot down on the
pedal first. Starting at tickover might give uneven running to start with.

 

I'll have a look though I don't recall this.

Doesn't putting your foot on the pedal mean the glow plug heating is cut
short after the initial timed setting?

The more I think about it the more I put it down to one or more worn
injectors which would possibly explain the large carbon build up on the two
failed glow plugs. Haynes suggests that the injectors should be overhauled
after every 60000 miles. Mines haven't been looked at for 175000 miles! And
are unlikely to be now unless it was at a reasonable price - anybody any
suggestions on cost? Apart from the irregular and slightly smokey start in
cold weather the car is running superbly - it is probably only worth £200
so the longer I can run it the better.

Jim

 

I'll have a look though I don't recall this.

Doesn't putting your foot on the pedal mean the glow plug heating is cut
short after the initial timed setting?

The more I think about it the more I put it down to one or more worn
injectors which would possibly explain the large carbon build up on the two
failed glow plugs. Haynes suggests that the injectors should be overhauled
after every 60000 miles. Mines haven't been looked at for 175000 miles! And
are unlikely to be now unless it was at a reasonable price - anybody any
suggestions on cost? Apart from the irregular and slightly smokey start in
cold weather the car is running superbly - it is probably only worth £200
so the longer I can run it the better.

You can get them on an exchange basis for £25 here:
http://www.parts4peugeot.com/acatalog/Online_Catalogue_Fuel_System_103.html

 

Is there another setting apart from the fast idle to aid cold starts?

If you look at the top of the injector pump, you will see microswitch which
is controlled by the throttle opening. It has to be activated for quite some
time before the afterburn on the heater plugs is stopped. Putting your foot
down at the point of starting until the engine catches will certainly not
affect this.

<injectors which would possibly explain the large carbon build up on the two

Don't believe everything which Haynes tell you. They also insist that the
cam belt is changed every 36k miles, when Peugeot say 72k. PSA make no
mention of routine injector maintenance.
I know many engines which have had the original injectors for well over
100k. If one is failing, you will hear that characteristic "knock", one
cylender firing more heavily.
Injectors drip when badly worn, allowing pre-ignition.
If you have a build-up on the heater plugs, a pound to a penny, it is caused
by lubricating oil being burnt.

If you go to a decent fuel injection specialist, they will regrind the
nozzles for you, or you can get exchange units as already described.

 

Central Scotland.

Jim

 

If you got problem with Injectors its best to let some one know what
they are doing to do them,like the company in Wimbledon called Watson
Deisels,tel numbers 02088793584-02088793861 give them a call if you
live, near wimbledon. but i bet they can help you in any way..
from Chris Addlestone Surrey