Today replaced the flame trap on my 1990, been years or never since checked. Used Flame Trap Kit from IPD. Flame trap on 1990 located above intake manifold pipes 3 & 4. With finger twisting, was able to pull the upper belled end of the PCV hose off of the lower S hose, and then replace in reverse order. Observations: Old flame trap was not clogged, but orifaces reduced by carbon & gunk. It was degraded by heat and after removal, the sides started to crumble with minor pressure. The little 5mm hose going from plastic fitting over to the brass nipple on the intake manifold was totally deteriorated and pinched, so replaced it. 3-way plastic fitting broke in the removal process. From the IPD stuff replaced the plastic fitting and also the 5mm hose in addition to the flame trap. The S-shaped hose that goes down to the oil separator comes with the kit, but the existing one was ok, and very difficult to access and replace, thus left it alone.
Also, rigged a "blower" with a funnel hose and a nozzle from vacuum cleaner. Attached funnel hose to the S-hose on oil separator. Removed engine oil filler cap. Blew hard down the hose into the oil separator, and got good pressure coming out of the oil filler. Hopefully indicating that oil separator is not clogged.
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