Number 3 glow plug on the 1990 2.5 Turbo is faulty. Ohmmeter reads around 20 Ω. Others around 1. It’s difficult to access as it’s buried under the intake manifold. I might be able to remove it nevertheless but I’m wondering if there are any tips to do so without causing damage such as stripping threads of head or snapping plug in head or just general tips to facilitate the job. I’ve done this job on 220D and 240D but never on a car with aluminum head and poor access. If manifold removal is inevitable are there any tips there?
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