Hi! I repaired GP15N Cat forklift- the issue was sensor for camshaft-the customer find item and changed it yourself; now engine start, work, but the idle speed of engine is fluctuating a lot, arbitrarily, at random intervals from 10-15s to 30-40s. I checked a lot of hardware, changed ignition coils(there were bad among them), changed spark plugs ( totally worn out), clean some concerning parts, measure some sensors - all are look quite normally. I noticed by scope an usual for me delay / shift between impulses from cam and crank sensors. Has someone a view of these signals and timing between them? Sorry, how I have not possibilities to provide picture here now!
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