Give us a clue

weldman · Feb 19, 2012

I've got a P38 just fitted new glow plugs now if I heat it once its a lousy started but if I heat it twice works fine so can some one please give me a clue as to why this happens

Thanks

Dopey · Feb 19, 2012

You bought cheap and nasty plugs, now try and get them out without breaking them

weldman · Feb 19, 2012

Dopey said:
You bought cheap and nasty plugs, now try and get them out without breaking them

Bought the ones recommended by local Landrover dealer

Dopey · Feb 19, 2012

What make are they?

wammers · Feb 19, 2012

They are not heating as they should on first application. Low battery power or a problem with glow relay or circuit giving volt drop. Check the voltage at the plugs when lamp is on.

Datatek · Feb 19, 2012

weldman said:
I've got a P38 just fitted new glow plugs now if I heat it once its a lousy started but if I heat it twice works fine so can some one please give me a clue as to why this happens

Thanks

I go with Dopey, cheapo glow plugs

jerrytlr · Feb 19, 2012

Recently fitted new glowplugs to my P38 (Delphi) and it started straight away when it was -13 deg .... does seem as though the plugs aren't up to the job, sadly.

To help us diagnose further, describe how it starts - for example does it turn over nice and quickly and just not fire? Does it fire but not quite catch? When it starts does it run smoothly on all 6 cylinders straight away or does it take a few seconds for all cylinders to come alive?

Cheers

Jerry

weldman · Feb 19, 2012

wammers said:
They are not heating as they should on first application. Low battery power or a problem with glow relay or circuit giving volt drop. Check the voltage at the plugs when lamp is on.

Hi Wammers

Put voltmeter on plugs running at about 10volts when light is lit what should it be ?

weldman · Feb 19, 2012

jerrytlr said:
Recently fitted new glowplugs to my P38 (Delphi) and it started straight away when it was -13 deg .... does seem as though the plugs aren't up to the job, sadly.

To help us diagnose further, describe how it starts - for example does it turn over nice and quickly and just not fire? Does it fire but not quite catch? When it starts does it run smoothly on all 6 cylinders straight away or does it take a few seconds for all cylinders to come alive?

Cheers

Jerry

Hi Jerry
Turns over nicely but doesn't seem to quite catch when started runs smoothly on all six cylinders straight away

weldman · Feb 19, 2012

Dopey said:
What make are they?

Hi Dopey

I fitted the britpart STC3103 seemed to be the one dealers around here said to go for

dogsbody · Feb 19, 2012

weldman said:
hi dopey

i fitted the britpart stc3103 seemed to be the one dealers around here said to go for

oops!

Dopey · Feb 19, 2012

Slam dunk!!!

Part Number: STC3103
Brand: DELPHI
Supplier: BEARMACH
Quality: Branded Original Equipment
Availability: NORMAL STOCK
Weight (+ vol): 0.03 kg
Price: £8.76 (10.55&#8364

STC3103 - DELPHI Heater Plug - New Rr 2.5Dt - Land Rover Parts Direct

Now.... just be very careful how you take them out when you replace them, you could be lucky as there not been in there for long, I think its best you take them out when the engine is COLD rather than hot, heat expands things

wammers · Feb 19, 2012

weldman said:
Hi Wammers

Put voltmeter on plugs running at about 10volts when light is lit what should it be ?

Bit on the low side i think. Check the connections on the glow relay in the ECU box.

theanswers · Feb 20, 2012

I put in 6 glowplugs from britpart about 4 months ago into my RR. She would only start on second round of heating... Recently the all gave up.

Removed the glow plugs to discover that two of the tips were broken and also the other 3 or 4 had also failed.

Complete Rubbish. Just fitted Delphi glowplugs today started perfect first time.

Much better job.

Datatek · Feb 20, 2012

weldman said:
Hi Wammers

Put voltmeter on plugs running at about 10volts when light is lit what should it be ?

10 volts is on the low side, what voltage do you have at the battery terminals? Having said that, I would expect 10 volts to be sufficient to heat the plugs OK.

weldman · Feb 20, 2012

Datatek said:
10 volts is on the low side, what voltage do you have at the battery terminals? Having said that, I would expect 10 volts to be sufficient to heat the plugs OK.

Hi Datatek
I've got 12.95V at the battery would there be a drop like that between the battery and the glow plugs ?

wammers · Feb 20, 2012

weldman said:
Hi Datatek
I've got 12.95V at the battery would there be a drop like that between the battery and the glow plugs ?

No there shouldn't. That's why i said check it and if it's low take a look at connections on glow relay. Glow relay takes it's power direct from battery look for heated connectors giving bad continuity. Take a battery reading with glows activated. If the battery still reads 12.95V and at the plugs you have 10V you have a problem.

Datatek · Feb 20, 2012

weldman said:
Hi Datatek
I've got 12.95V at the battery would there be a drop like that between the battery and the glow plugs ?

The battery voltage is good. The drop to the plugs can be many things from the Glowplug relay to a bad earth or poor glowplugs drawing excess current. Never seen more than 11 volts or so at the glowplugs so I don't think that 10 volts is your problem. I'll check the voltage on mine tomorrow

weldman · Feb 23, 2012

I,d just like to thank every one for there help with this looks like I slipped a boob with the glowplugs will replace asap looks like I'm going to be a bloody dab hand at changing these by the time I've finished

Thank once again

dogsbody · Feb 23, 2012

weldman said:
I,d just like to thank every one for there help with this looks like I slipped a boob with the glowplugs will replace asap looks like I'm going to be a bloody dab hand at changing these by the time I've finished

Thank once again

PLEASE come back and tell us the result. It's how we all learn - other buggers spending their money to save us.

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