Peugeot 306TD Starting - pug306td
I have recently purchased a 1997 306TD. It had a cambelt change last year. over the last few weeks starting it is becoming more of a problem. i have already replaced the glow plugs but have noticed that the voltage at the last one is 10V (a trustee well known manual advises to check the voltage but oes not say what it should be) is a 2V voltage drop normal? also even when the engine is warm/hot I still have to use the glow plugs. The problem seems to have got worse since I changed the thermastat housing gasket and water ran down the front of the engine, however this may be completely coincidentdal. finally when changing the gasket, i took a "loose" tube off the front of the (i think its the diesel heater) which has a needle type valve on the end for ease of undoing the yop bolt.
Any ideas would be great. It does start eventually with clouds of white smoke which very quickly clears.

Thanks
PEUGEOT 306 TD STARTING - thomp1983
the valve you refer to is for bleeding the water from the diesel. this sounds like your getting air in the system. first place to check is around the fuel filter housing. did you fit a new filter when you did the thermostat housing? the seal on the top of the fuel filter can be a pain at times. try squeezing the black bulb on the left until it's hard then start the car should find it will start alot easier, if so it's definately air in the system just need to trace where

chris
PEUGEOT 306 TD STARTING - pug306td
i did not replace any filters, all i had was a slight water leak from the housing, so replaced the thermastat housing seal. i have had a good look around all the pipes and cannot see any obvious leaks (ie visable diesel) i have tried pumping the black buld it goes hard and then about 10 seconds later goes soft agian? is that normal? is it worth trying to bleed the system? if so should i bleed it with the engine running and loosen the top of the injectors?

thanks
PEUGEOT 306 TD STARTING - thomp1983
the problem with diesels is they tend to suck air in rather than leak diesel out so you generally can't see the leaks. the black bulb will stay solid until you start the engine then it will go soft as the fuel pump sucks the diesel from it. there is generally a bleed point on the fuel pump for bleeding the system. did you disturb the black fuel filter housing at all during the job for the thermostat? if so id suggest taking the top off it again and trying to reseat the seal. the other way to find the fault is to fit a clear fuel line from the primer bulb to the filter housing and one from the filter housing to the fuel pump that way you can see where the air is and diagnose it

chris
PEUGEOT 306 TD STARTING - pug306td
I guess that as i don't know when the fuel filter was replaced i might aswell start there, replace the filter snd seal and see what happens from there.
PEUGEOT 306 TD STARTING - David Horn
You can expect to use the glowplugs every time you start the engine, even if it's hot. The only occasion they're not necessary is if the engine has stalled and you're immediately restarting.
PEUGEOT 306 TD STARTING - pug306td
That makes sense, the reason i questioned it was before this i had a mondeo TD which when the engine was up to temp it started fine without glow plugs, i guess i'll have to be more patient!!!
PEUGEOT 306 TD STARTING - track
try replacing the injector leak off hoses, these are prone to leaking and in ideal place for air leaks in the diesel system. Halfords do the hose for a few pounds.
PEUGEOT 306 TD STARTING - pug306td
Sounds like a plan, but what are the "injector leak off hoses"? are they the pipes which run between all the injectors?

thanks
PEUGEOT 306 TD STARTING - thomp1983
yes there the ones they go brittle and hard

chris
PEUGEOT 306 TD STARTING - autumnboy
try replacing the injector leak off hoses, these are prone to
leaking and in ideal place for air leaks in the diesel
system. Halfords do the hose for a few pounds.


If your fuel system is Lucas/CAV then these leak off hoses are not your problem. As these, if leaking do not effect the Lucas system in Starting.

But if you've got a Bosch system, then these will cause your bad starting as air will get into the lines and give you grief. Although they may not be signs of any leaks, but if you disturbed them while doing your thermostat, they'll crack if they have been on the engine awhile, not only the pipes between the injectors, but any pipe from the filter or pump etc.



PEUGEOT 306 TD STARTING - pug306td
everything seems to be pointing towards an air leak, is there any easy way of finding the leak? would the leak definatley be on the pipework, or could it be an injector seal (if there are any)? the bulb when pressed goes firm for probably 10secs, would this indicate a problem with the priming bulb? the glow plugs are only a month old, is there any way of testing them with a home voltmeter to see if i have a duff one, as it seems to start fine if i leave it about 10secs after the light has gone out or if i keep cranking the engine (which my neighbours love at 6am)

Thanks agian for all your advice.
PEUGEOT 306 TD STARTING - thomp1983
cheap plugs can fail very quickly. can be tested by removing them, putting a negative jump lead to the body and a positive to the base where nut goes, they should light up white hot. when you say the pump goes hard then soft, is that for hard for 10 seconds without starting the car then is soft if squeezed again? if so id imagine you should probably be able to hear the leak if you listen carefully. common leaks are, at the join from the primer bulb pipe to the fuel filter, injector leak off pipes, fuel filter seal there the most common three, 2 are easily fixed, replace leak off pipes and fuel filter seal then see where your at, after that id suggest fitting clear pipe to and from the fuel filter housing as this will show if air is getting in before or after the filter

chris
PEUGEOT 306 TD STARTING - autumnboy
everything seems to be pointing towards an air leak, is there
any easy way of finding the leak? would the leak definatley
be on the pipework, or could it be an injector seal
(if there are any)? the bulb when pressed goes firm for
probably 10secs, would this indicate a problem with the priming bulb?
the glow plugs are only a month old, is there any
way of testing them with a home voltmeter to see if
i have a duff one, as it seems to start fine
if i leave it about 10secs after the light has gone
out or if i keep cranking the engine (which my neighbours
love at 6am)
Thanks agian for all your advice.


Ok, But do you have a Bosch or Lucas/CAV system. As I said before if its a Lucas system you could waste your time and money tracing the fault on the fuel system, But if its Bosch then as already said you can get a kit from Halfords or a local Motor Factor and this will be enough to replace the small pipes, which is normally at fault.

If you pump your bulb till its hard at first thing in the morning with the ignition on, does it start any easier. If not then your fault lies elsewhere such as your Glowplugs or Relay.

As far as testing the plugs with a meter, the best way without removing them would be to remove the existing interlink wiring from the plugs. Get a Headlamp bulb with wires attached to it and connect one end to the + on the battery and the other wire to the small thread on the plug. If the bulb lights up then the plug is OK, if not then its duff. This way is a more sure way where the bulb give resistance to ensure connectivity and the meter may not.

You can use your meter to check that the relay is working, where you should see approx. 10DCVs for approx 10secs, if none at all, then this maybe your fault.

Good Luck

PEUGEOT 306 TD STARTING - pug306td
it is a lucas pump, from what you are saying is it not likely to be an air leak, after pumping i still have problems starting, if not worse, almost as if it is flooded (if deisels can) i will test the glow plugs, can the relay be tested or does it either work or not work? when i have checked the voltage on the glowplugs it shows about 11 volts for about 15 seconds, this seems to be the same as a freinds. can the relay have an intermitent fault?

Thanks
PEUGEOT 306 TD STARTING - autumnboy
can the relay have
an intermitent fault?


It could, but doubtful.

If you've got any jump leads. When its not starting, you could clamp a lead to the a Glow plug with the inter-connecting wiring intact and the other end to the + on the battery. Then see if any difference in starting.

When starting, try leaving the starting about 5 or 8 secs after the light goes out.

It looks if as if it could be a duff plug or two.

PEUGEOT 306 TD STARTING - pug306td
if i leave it for 5 to 8 seconds after the light it seems to start ok unless i have already tried to start it without waiting long enough. the glow plugs were bought from peugeot under 2 months ago, but they could be dud. i'll get them checked out.
any recomendations for decent glow plugs?
PEUGEOT 306 TD STARTING - autumnboy
It sounds if you a couple of duff plugs.

I use NGK or if you go to GSF Car Parts they supply the Original Plugs "Beru" that Citroen and Peugeot use at the factory.


www.gsfcarparts.com/
PEUGEOT 306 TD STARTING - thomp1983
try turning the ignition on, let the light go out, turn ignition off, turn it back on let light go out again then try starting if it's any better then it's definately the plugs

chris
PEUGEOT 306 TD STARTING - pug306td
it looks like i will have to get the plugs checked out. i think there must also be an air leak as the priming bulb does not stay hard after it has been pumped. but i will do one thing at a time.

thanks
PEUGEOT 306 TD STARTING - autumnboy
i think there must also be an air leak as
the priming bulb does not stay hard after it has been
pumped.


Mine don't either, but it starts easily a few secs after the light goes out.
Summer or Winter.