They need a clogged vacuum from the the cam cover
To reduce the crank pressure before it builds up

What's Going On With My Spark Plugs?
Started by
Foxy
, Jun 07 2017 05:03 PM
62 replies to this topic
#61
Posted 10 June 2017 - 11:08 PM
#62
Posted 10 June 2017 - 11:23 PM
A slight vacuum not a clogged vacuum
Lol
#63
Posted 12 June 2017 - 09:40 AM
Or air flow and fuel pressure difference across the inlet manifold and injectors making different ones run leaner or richer. When I put a Saab head on mine you could see the combustion chambers and valves go lighter to darker across the head. Sent from my SM-G920F using TapatalkCommon on all L4 engines for C1 and C4 to be massively different temperature to C2 and C3 due to flow of coolant.Is there a known reason why that particular cylinder has problems on the Z22? Maybe bad design of the inlet plenum perhaps, or somesuch?
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