Well the car has been issue free for almost 4 years and then a few weeks ago i started having issues with the idle speed and dying when coming off the throttle at lights etc.
My CIS knowledge was pretty good 4 years ago when Tony helped me extensively to get the engine running after having numerous issues including the wrong WUR. I've combed back through my notes and some of the saved threads to put me close to the right track I hope
WUR 0438 140 089 31ohms at ambient
It first started with being a bit jerky cold and warm, occasional stalling but still easy to start... I resolved to there being a vacuum leak and hooked up my pump and various gloves to close off and found two smallish leaks around the POV. With some JB weld I blocked them off and re-check confirmed no further visible leaks. I thought this would solve the issue and be back to normal with nothing else changing.... wrong.
So now, cold start good but only rev's to 1100rpm at cold start, after 4.5mins starts dropping to 1050 and by 6mins its 800rpm for the next few minutes then at 9 mins its 600rpm and stalls.
Warm Restart is fine, but idle still too low and dies., can keep running with a little throttle.
I thought perhaps AAR, 0 280 140 201, ohms at ambient is 32.
10mins in the oven 85c and it's fully closed.
Left it in the freezer overnight and it's half open at best.
At Ambient its probably 90% closed.
I also borrowed a AAR off a friend, haven't tried in car yet but it's performed and looks exactly the same after freezer, oven and ohms test.
I've ordered S&G Fuel pressure gauges from USA but they 3-5 weeks away so me and you guys are flying blind for a bit which is not ideal.
Due to fixing the air leaks could it be as simple as now adjusting the idle/ bleed screw to increase idle? I'm not convinced on this as it had fine idle before.. it may fix it but think I have another issue.
Fuel Accumulator was brand new 4 years ago, 4500mile
Fuel pump new also
WUR was a recon/tested unit from Tony at same time.
Perhaps lean the mixture screw CCW to adjust after air leak fixed.. again was ok prior two weeks earlier.
Could double check sensor plate to make sure that is as per spec in Bosch manual?
Could try raising idle screw and take note of turns to prove the point..
Anything else I could check before my gauges arrive? 3-6 weeks without using my 911 is not ideal...