I’ve acquired a 1999 miata ls with a faulty engine and have planned a swap with a complete 2001 vvt engine,. The motherload of information you all have been waiting for Here's a sign for you to change yours too
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There’s a filter for vvt oil feed which 90% of shops don’t know of, i suggest you replace that first You will have to replace that even. Hundreds of pages allow you to. The variable valve timing (vvt) solenoid helps your camshaft to adjust the timing to increase performance