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Hmm, assuming smoke test at this point didn't cast it's net wide enough then.
The car has a k&n air filter the original air box is gone before I owned it (wanting to correct this at a later date). On the manifold there are two blanked hoses, one at the rear next to the brake vacuum connection...
Hi Guys, any input on this would be great!
I have stripped the in-take manifold right back to the head and refreshed all seals form new, cleaned everything and correctly torqued and put back. Followingthis the idle is full time 4000k...
I got the car to a garage with a smoke machine and left...
Hi MicKPM
There is a Seal between Head and manifold as I can feel the tab at the base of the manifold inlet 4, but yes pretty unhappy with the fact that there is clearly sikaflex applied somewhere in the joint. Worset case is the seal was broke and sika applied to make good, best it was added...
Thought I would just check it again and film the result of adding gas...
The incresase in rpm is gone and after a few more sprays of gas, the idle settled down to 1000. There seems to be a lag on pushing the throttle.
Really confused now, nothing conclusive... still sitting between throttle...
Having had the head changed on my 172 Cup following it dropping a valve in cyclinder 1, she was running sweet for around 1000 miles.
The issue started with the idle becoming elevated and uneven. Where as it would sit at a round 850-950 once warm, it started rising up to 1110-1200 waverring...