I know its been asked ALOT before, but

[Philip1972]

I cant find the answer to this.

Glow plug light comes on for a second then goes off.

Lumpy idle for 30 seconds and then settles down. But the the glow plug light comes on (steady on) for approx 2 mins, then goes off. Does that every time it starts, hot or cold.

Had codes read, needed glow plug 2 replacing which was done, but still got this issue. No fault codes present.

Is it the relay?

 

[KennyN]

When my relay gave up the ghost there was no indication on the dash , just extended cranking from cold.

When a GP gave up the ghost it was as you described with the light coming on then going off after a few mins , i replaced all the plugs and have had no repeat issues.

Possibly another one has popped , i would replace the remaining five and be done with it as IIRC they were only around £15 each.

Do you have the old style relay ?

Kenny

 

[m80]

I had one glow plug blow so replaced all.
The light behaved as yours does, a good while later I got around to replacing the relay and all is now good.

I had no problems with starting at any time.

 

[Philip1972]

When my relay gave up the ghost there was no indication on the dash , just extended cranking from cold.

When a GP gave up the ghost it was as you described with the light coming on then going off after a few mins , i replaced all the plugs and have had no repeat issues.

Possibly another one has popped , i would replace the remaining five and be done with it as IIRC they were only around £15 each.

Do you have the old style relay ?

Kenny

Not sure how I can tell an old relay?

Its square and the edges are at 90 degrees. It does not have a sloping side like some I have seen?

 

[Alex225]

I had one glow plug blow so replaced all.

Did the same in my other half’s CLS350. Light was coming on and staying on intermittently for a minute or so. Slightly hesitant starting on colder days. Replaced all of the glow plugs for piece of mind. Now all good and no light.