richard_koenig1
Aveo Glow Plug Issue
Summary of the thread
A 2006 Chevrolet Aveo with a diesel engine is experiencing issues with the preheating lamp staying on and an error code, suggesting a glow plug problem. The symptoms include rough idle during cold starts, which is indicative of glow plug failure. To diagnose, checking the resistance of each glow plug with a multimeter is recommended, with a good glow plug typically showing resistance below 1 ohm. The issue was confirmed and resolved by replacing the faulty glow plugs at a professional workshop.
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4 comment(s)
richard_koenig1 (community.author)
OK, multimeter it is then. So, what resistance am I looking for roughly? And yes, actually, I had a tiny bit of a rough idle on a couple of cold starts just before this all kicked off. Is that significant?
michaelmoeller7
A rough idle on cold starts is a classic symptom of glow plug failure, especially in diesel engines. The exact resistance will vary, but typically a good glow plug will measure a very low resistance, usually below 1 ohm. An open circuit (infinite resistance) or very high resistance means it's definitely toast. Considering the symptoms, and the rough starts, I strongly advise you to have it inspected by a professional workshop.
richard_koenig1 (community.author)
Appreciate the confirmation. I took it to a shop; you were spot on. Glow plugs were bad. 440€ later and it's sorted. Thanks for the advice!
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CHEVROLET
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AVEO
michaelmoeller7
Given those symptoms – preheating lamp staying on and error code pointing that way – a defective glow plug is highly probable. To confirm, use a multimeter to check the resistance of each glow plug. A significantly higher or lower resistance than specified indicates a faulty plug. Did you experience any difficulty starting the engine when cold before the lamp started to stay on?