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The 94 weren't TDI they were IDI, assuming this is a North American car.
It is probably slightly different but on the TDI low glow plug duration could be related to a bad coolant temp sensor. It thinks it's not cold out so it doesn't light the glow plugs for long.
Hard starting could be low compression. A cold engine quickly dissipates the heat from compression and makes harder starting because diesels need compression to start.
Not sure on the IDIs, check the vwvortex diesel forum or vwdiesel.net for older diesels: http://www.vwdiesel.net/forum/
If it's like the TDIs you just pull the wire and replace.
It is probably slightly different but on the TDI low glow plug duration could be related to a bad coolant temp sensor. It thinks it's not cold out so it doesn't light the glow plugs for long.
Hard starting could be low compression. A cold engine quickly dissipates the heat from compression and makes harder starting because diesels need compression to start.
Not sure on the IDIs, check the vwvortex diesel forum or vwdiesel.net for older diesels: http://www.vwdiesel.net/forum/
If it's like the TDIs you just pull the wire and replace.
