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Leaking injector causing cylinder to be washed

Djw085
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Duncan Grand Master

Duncan

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Posted

Absolutely. The rings won't bed if the bore is fuel washed.

How much compression has gone missing (how does the leaky cylinder compare to the others?)

and, did it have a missfire for those 40 mins?

finally, once the injector is replaced you may still be able to get the rings to bed properly by running it in hard on a dyno to save having to remove, disassembly and re-hone.

Djw085 Rookie

Djw085

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It didn’t misfire when I first started it it started misfiring after I ran it for 20 mins then changed oil and filter (as directed) ran it again and the miss started shortly after that. It had next to no compression in the 3rd cylinder.

KiwiRS4T Grand Master

KiwiRS4T

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Posted
13 hours ago, Djw085 said:

It didn’t misfire when I first started it it started misfiring after I ran it for 20 mins then changed oil and filter (as directed) ran it again and the miss started shortly after that. It had next to no compression in the 3rd cylinder.

Did you refill with mineral oil? Have you repaired/replaced the faulty injector? As per Duncan's suggestion try running in procedure,

Stick it in third, accelerate briskly (not with full boost if turbo) to about 6000 and then lift off completely til revs drop to about 2000 and repeat for about half an hour. Do not be alarmed if you get a puff of blue smoke when you floor it as oil will be sucked past the non sealing rings on the overrun (so  check your oil level regularly). Keep an eye on your temps and (if you have a gauge) oil pressure. Then repeat the compression test.

Will not work with synthetic oil!!

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