Smoky start in cold weather. What next?

[mikeonb4c]

Sounds a bit lumpy on first starting. I'd like to see how much it's smoking.

[sotal]

It's when it is lumpy that it smokes. With it being a bit warmer it clears itself, smoking was minimal/acceptable . It is when it gets colder that it really starts to smoke and requires a few revs to clear. It is lovely today so pointless testing but it is supposed to get colder next week so will do some more testing then.

[Bongolia]

Just a thought on your gp testing. When you do your tests leave the volt meter attached to the gp rail. Not sure in bongos but some systems maintain the voltage for a period of time once the engine is running sometimes at a reduced voltage.This may be dependant on engine coolant temp.
Anyone?

[teenmal]

Just a thought on your gp testing. When you do your tests leave the volt meter attached to the gp rail. Not sure in bongos but some systems maintain the voltage for a period of time once the engine is running sometimes at a reduced voltage.This may be dependant on engine coolant temp.
Anyone?

Yes you are correct, the glow/heater plugs are controlled (initially) by the temperature (coolant temperature) and the engine speed (RPM).

In actual fact if you are only travelling short distances they can be on all day. These plugs /and heads are designed for this operation and will perform quite happily .

[Bongolia]

Ah hah!!
Sotal do yours do this?
Teenmal At what temp do they switch out?
Do they run at reduced volts after start up?

[g8dhe]

There is no reduced voltage/ current to the plugs they are either on or off!

[sotal]

Surely once the relay has clicked off, then they are off?

When I was checking the wiring they certainly went to 0 volts when the relay clicked off.

[teenmal]

Surely once the relay has clicked off, then they are off?

When I was checking the wiring they certainly went to 0 volts when the relay clicked off.

You are perfectly correct , but we are talking about "Engine Running" here.

the glow/heater plugs are controlled (initially) by the temperature (coolant temperature) and the engine speed (RPM).

In actual fact if you are only travelling short distances they can be on all day. These plugs /and heads are designed for this operation and will perform quite happily

[sotal]

So you're saying they click back in again once the engine is running?

[teenmal]

So you're saying they click back in again once the engine is running?

On a cold engine at under approx 1500 rpm approx. .....Yes.

[sotal]

I'll check, do they instantly turn back on? Or is there a delay?


The only other thing I could think is that when I am waiting for the relay to click off, I can hear a bit of a whirring noise like a pump. Do these have an electric pump to get fuel pressure ready?

(Facelift Diesel)

[teenmal]

I'll check, do they instantly turn back on? Or is there a delay?


The only other thing I could think is that when I am waiting for the relay to click off, I can hear a bit of a whirring noise like a pump. Do these have an electric pump to get fuel pressure ready?

(Facelift Diesel)

No EMC, the whirring noise could be under voltage to the relay and the contacts Chattering.

[sotal]

The whirring isn't from the relay area, I think it is coming from somewhere around the engine.

[g8dhe]

The ECU commands the relay, if the engine temperature is not sufficiently high for the rev's being asked for then the relay will operate to keep the glowplugs hot. So if you start and sit on the drive after a couple of minutes the glowplugs will turn off, if you then accelerate the ECU may turn the plugs back on again to make sure the fuel will ignite in the shorter time available.

[teenmal]

The whirring isn't from the relay area, I think it is coming from somewhere around the engine.

Sorry , I would need to hear it first hand, but I would think probably voltage drop related on a solenoid etc , but this is just a guess .