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Discussion Starter #1
I have a 1995 Peugeot 306 diesel that I have trouble starting from cold/hot I have changed fuel filter and glow plugs and made sure there's a 12 volt supply to them all is fine but it takes ages to start once its started it blows white smoke out which smells like unburnt diesel even from warm it is difficult to start once its started it runs perfect doesn't use any oil or water can anybody shed any light on the problem please
 

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Sounds a bit like air is getting in the fuel line.
Had a diesel that had very similar symptoms difficult to start, left for 10 mins once it was hot and the same thing all over again.
There probably won't be any signs of fuel leakage.
However have you tried the double/treble ignition on/off then start up, if this improves things then look at the glow plug relay and even though you've just fitted new plugs take them out and test them all across the battery looking for a lazy plug
 

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Does sound like air in the fuel. Check filter housing seal and also the priming bulb - the latter can develop pinhole leaks which while not big enough to piss diesel everywhere they are enough to allow air in while the car is stood.
 

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Have you checked the valve clearances? These tighten up in time and can hold the valves slightly open, causing drastic loss of compression and very poor starting. It will also cause unburnt fuel (white smoke) to be ejected from the exhaust.
 

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Yes, worth checking the valve clearances as Brilec advised.

Has this problem just started?

Did you change the fuel filter before or after the problem started?

Even with a one way valve the fuel can still syphon back to the tank via the return if the leak off pipes aren't air tight, so double check them, not forgetting the one that goes to the pump and also the blanking piece on the last injector.

Smearing grease around the joints is a trick used to help trace air leaks.



Cheers.
 
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100% sure glow plugs are ok? I replaced mine on a 306 a few year back and started getting no end of trouble. I replaced loads including new injectors. As a last resort bought some more glow plugs, fixed it straight away. Must have been a duff set, bought them from euro as well.
 

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The plugs euro gave you could have been the standard glow plugs, you need the long burn plugs for the TD's as the plugs continue to glow for up to 3 minutes after the engine is started.


Cheers.
 
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The plugs euro gave you could have been the standard glow plugs, you need the long burn plugs for the TD's as the plugs continue to glow for up to 3 minutes after the engine is started.


Cheers.
Could indeed have been that,
 

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If you specified the vehicle, they should not have made that mistake, however they do get things wrong sometimes. I have twice recently had to return a battery sold for the vehicle specified, and in both cases it wouldn't physically fit - too long for the battery tray.
 

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Does yours have a priming bulb or lift pump?

My 307 was a sod to start recently and after replacing the priming bulb, is almost perfect no matter what temp the engine is....
 

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Discussion Starter #14
Does yours have a priming bulb or lift pump?

My 307 was a sod to start recently and after replacing the priming bulb, is almost perfect no matter what temp the engine is....
mine is fitted with a priming bulb but my glow plugs don't stay on for 3 minutes after engine has started as quoted in an earlier reply
 

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Glow plug RELAY will stay on but light goes out so unless you are using a multimeter you wont know

Time they work for is variable though as they use a temp sensor to decide how long to stay on for its not a fixed 3 mins
 

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Glow plug RELAY will stay on but light goes out so unless you are using a multimeter you wont know

Time they work for is variable though as they use a temp sensor to decide how long to stay on for its not a fixed 3 mins
:iagree:

Starting from cold the plugs stay on for approx 3 minutes. (the dashboard light doesn't stay on)

If the coolant is 60 degrees or over the plugs will only come on for the standard 15 (or so) seconds.
Some of the diesel pumps have a micro switch that is activated by throttle position, if this is activated for a couple of seconds it also interrupts the 3 minute cycle.


@ Brilec,
Aye they do often get it wrong...have had the standard plugs supplied a few times when they should have been the long burn plugs :nono:
 

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Discussion Starter #17
leak off test on peugeot 306 diesel

after doing a leak off test on my 1995 Peugeot 1.9 turbo diesel is this possible
 

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The injectors on your car are the pintle type, these are tested by checking the spray patten and the pressure at which they open, this is often called the crack off pressure.

To have them tested they need to be removed from the engine and taken to a Diesel injection specialist. You can have new pintles fitted and the crack off pressure adjusted on them.

Watch the video in the link, it shows the spray patten they should have.

https://www.youtube.com/watch?v=b4E28hDgXCw



Cheers.
 

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Is it a turbo engine? If not then the glow plugs don't stay on.

Have you checked the valve clearances? No point in looking all over if you don't have enough compression to make the engine start. Been there with that engine.
 
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