I have been looking at old posts about changeing glow plugs and there are differant opinions on it, some people say that you shouldn't change them yourself because you can shear the threads and ruin your head and other people say it is easy.

Have any members changed the plugs on there 1.9 mjet ? How did it go was there any problems ?

Any help would be appresheated greatly.

Do you have difficulty starting the car? If not why change them? Fairly straightforward with the right tools, care taken etc. Treat them like spark plugs as the last thing you want is to snap one off or cross thread on fitting the replacements....

Ffoxy said:

Do you have difficulty starting the car? If not why change them? Fairly straightforward with the right tools, care taken etc. Treat them like spark plugs as the last thing you want is to snap one off or cross thread on fitting the replacements....

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At what mileage should the Glow Plugs be changed? I don't think it's mentioned in the handbook?
What are the benefits from changing them?

All they do is warm the block pre-ignition to aid with cold weather starting, unlike spark plugs they do nothing at all while the car is running. As Ffoxy says, if the car starts fine I wouldn't bother changing them. But by the same token, just because you might be having starting issues doesn't mean the plugs are on the way out (for example poor starting on a warm day, plugs will have done nothing to help as block will already be warm enough so you'd be looking for problems elsewhere).

my glow plug lights has been coming on for months now, but never really had a problem with starting car at all, in idle sumtimes its a bit vibratey but tht may be down to it being a diesel and it being cold as unlike spark plugs they cant mis fire etc