If you were to go further than removing the elements (the part you are meant to remove for a drip test => PeachPartsWiki: How to Set IP Timing via the Drip Tube Method) then you're going to need to take the IP to someone who has a test bench - it will have to be set up and adjusted. I'm not quite sure how expensive that would be.

If the inside of the governor is all gunked up then you might have a totally knackered injector pump. The IP is lubricated with engine oil which if it has been blocked may mean a very work out piece of machinery.

I've been playing about with a spare IP (I haven't gotten too far with it). There was a lot of gunk in mine too but it looked more like really really grotty engine oil.



Papa's got a brand new om617 IP to play with!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!