This guide is meant to show you where the glow plugs are located so you can make your own decision on whether you think you can change them yourself or if you need a specialist.

I know I felt bewildered trying to work out how to diagnose whether a plug needed replacing or just a fuse. There's lots of info out there, but I couldn't find anything specific to the 1.9 MJet which has a different setup.

There's a great guide written by Argonought for the Fiat Stilo Jtd; I've decided to provide some Grande Punto 1.9 MJet specific images to help those with the 1.9.

The procedure is the same as his guide, so please use this guide in conjunction with theirs:

First Off,
Disconnect the battery!

Remove the two strews holding on the plastic cam shaft cover in place and then gently remove the cover.

in the 1.9 MJet, the plugs are located in the engine bay *behind* the cam shaft

It's very hard to even see the Glow Plug heads given their location behind a number of other pipes..harder still is taking a photo of them!

If you look carefully with a torch, you might just be able to see the colour of the wire poking out the top. Some threads suggest the colours corresponding to plugs 1, 2, 3 and 4 varies depending on the model. So it's worth a look to see if you can tell which colour goes to which plug in your engine.

The wires are only coloured by two lines on each side, i.e. they're actually grey wires with either red, yellow, green or light grey strips down two sides.

There might be a lot dirt on the wires too, so be careful not to confuse this with the wire coloured grey with a light grey stripe.

In my engine Fiat Grande Punto 1.9 MJet, the plugs were arranged:
1 = Yellow
2 = Light Grey
3 = Green
4 = Red

(1 being left most plug when looking at engine bay)

Following the advice in Argonought's thread (for the Stilo), you can detach the Glow Plug Relay unit from the bulk head. The 10mm screw is located above the relay - ignore the bolt below the relay as this is used to hold a live wire in place.

Once unscrewed, turn over (carefully) and remove retaining spring. It might be designed that you just push the spring in to release but I just used pliers to pull it off.

Then you can remove the connector and test the plugs using your multimetre.

At this point I learned my Yellow Wire had no current passing through (whilst the others did), so I know plug 1 is faulty.

At this point I also dropped my camera onto the concrete floor, breaking that's where the photos end. :cry: