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PCA guys have been recommending periodic use of PEA based injector cleaners to keep them clean. Bore scoring of course is a major concern for them and injector failures are a contributing factor as well with them. I haven’t settled on a service interval for mine, PO changed them out at around 90k miles trying to troubleshoot a stumble. But as this is a forever car for me I’m leaning on having to do them again at some point even with a twice yearly dose of Techron additive.
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