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IPI (intermittent pilot ignition) or HSI (hot surface ignition)?
If it is an IPI, you can see if the ignitor is pitted and corroded from years of use. Flame signal will degrade after time.
HSI as mentioned will get whiteish as they age.
Both prove flame after ignition so their ability to prove safe combustion after ignition is as important as igniting the flame.
IPI ignitors clean with some emery cloth and the grounding rod too. Make sure that there is a good ground.
HSIs can be gently dusted with compressed air. They can be more fragile as they age. Visible cracks are a bad thing.
IPIs can be tested for micro amps as an input to the ignition board.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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