D5 (2005 on) - Cold Starting Issues & smoke on hard acceleration - Page 2

davebb · Mar 14th, 2018, 20:21

Hi is the intercooler ok,
Dave

n217970 · Mar 27th, 2018, 08:58

Quote:

Originally Posted by n217970

Sorry to dig up an old post but OP if you are still around did you ever find a solution to the unburnt diesel on a cold start? I have the exact same problem on the same engine of the same age (although only 70k miles). Replaced all the glowplugs for new but to no benefit.

Just to come back to this I have for now had an improvement, Vida had a code for open circuit on glow plug 5, cleaning the contacts up on the relay/glow plug has made the error go away and the car starts much better - although still a bit of unburnt diesel coming out the back it's now an amount I can live with + no more rough idle.

davebb · Mar 27th, 2018, 10:50

Hi Thanks for letting us know,
Did you test glow plug No5 with a ohm meter to see what it was reading,
Dave

n217970 · Mar 27th, 2018, 11:33

To be honest no I didn't test it as I changed all 5 for brand new ones in November or December. I'll try and test it at some point on the weekend and see if its as good as the others.

n217970 · Apr 9th, 2018, 15:13

Just wanted to come back and hopefully give a "final" update on this.

After last post I did an ohm test on 5 and it was fine, same reading as 4 and 3.

But the problems came back over easter and now Vida reported plugs 2 and 5 as open circuit. Without checking anything else I bit the bullet and ordered a new relay.

Relay came, fitted, still open on 2 and 5. Sigh. Multimeter out and start from the beginning. Plugs 2 and 5 both now failed an ohm test. Went and bought 2 new plugs to replace. Good news is now all plugs work fine, car starts much better.

Being an inquisitive type I decided to cut the old relay open to see whats in there - and wow they have moved on a bit. Anyway what I can see from looking at the board is plugs 2 and 5 share the same voltage regulator. 1,3 and 4 each have their own.

In summary I suspect the voltage regulator has gone bad in the relay. Fix = new relay.

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Mar 14th, 2018, 20:21	#11
davebb Premier Member Last Online: Today 17:09 Join Date: Aug 2013 Location: Emsworth,hants	Hi is the intercooler ok, Dave

Mar 27th, 2018, 10:50	#13
davebb Premier Member Last Online: Today 17:09 Join Date: Aug 2013 Location: Emsworth,hants	Hi Thanks for letting us know, Did you test glow plug No5 with a ohm meter to see what it was reading, Dave

Mar 27th, 2018, 11:33	#14
n217970 New Member Last Online: May 1st, 2021 22:00 Join Date: Apr 2015 Location: Yorkshire	To be honest no I didn't test it as I changed all 5 for brand new ones in November or December. I'll try and test it at some point on the weekend and see if its as good as the others.

Apr 9th, 2018, 15:13	#15
n217970 New Member Last Online: May 1st, 2021 22:00 Join Date: Apr 2015 Location: Yorkshire	Just wanted to come back and hopefully give a "final" update on this. After last post I did an ohm test on 5 and it was fine, same reading as 4 and 3. But the problems came back over easter and now Vida reported plugs 2 and 5 as open circuit. Without checking anything else I bit the bullet and ordered a new relay. Relay came, fitted, still open on 2 and 5. Sigh. Multimeter out and start from the beginning. Plugs 2 and 5 both now failed an ohm test. Went and bought 2 new plugs to replace. Good news is now all plugs work fine, car starts much better. Being an inquisitive type I decided to cut the old relay open to see whats in there - and wow they have moved on a bit. Anyway what I can see from looking at the board is plugs 2 and 5 share the same voltage regulator. 1,3 and 4 each have their own. In summary I suspect the voltage regulator has gone bad in the relay. Fix = new relay.

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