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Damon88 Damon88 is offline
1978 911 SC
 
Join Date: Nov 2021
Location: BC Canada
Posts: 379
Garage
Back with an update.(work has been busy) Smoke test kit arrived and sure enough I had some leaks where the Brake vacuum splits off to other connectors to air box. There were no other signs of any leaks, so that is great. Everything fixed and back together. Smoke test was perfect.( Thank you Tony for the suggestion). Also installed new fuel Injectors, sleeves and O rings... wow, what a job. Also cleaned all the throttle housing.

Went for a drive and my problem still exists...after reading Andrews site, I figured I would try and set the idle to 13.2. Idle surges a little when engine is warm. Assuming, because it's set rich. Cruising in any gear & any RPM, I show roughly 13.4/ 13.6 AFR steady. When I accelerate hard and hold it to the floor it starts jumping to 15/16.9/18 AFR but quickly comes down once I reach speed.. The AFR gauge fluctuates so quickly.. If I stay in 2nd or 3rd gear and slowly increase speed on highway and stay around 5500 rpm it's steady at 13.3 and when I decelerate it goes down around 12.3 /10.5 quickly then back to 13.4. Driving around town it stays between 13.2 and 13.8

I did a fuel pressure test a month or two ago. My cold pressure was in spec. Warm, I did have to run the fuel pump pressure test on for up to 10min, to get a proper spec. then checked the residual pressure for the next 20 min and it was in spec. I think the Bentley Manual says to run the fuel pump for 3 mins and then off and watch the pressure for up to 20 min..This is a new WUR from Kjet and have spoken with them to make sure it is in spec... Sorry if this sound confusing, just trying to paint the clearest picture of what's going on. The car starts perfect warm or cold and absolutley rips on the highway..

If anyone has any suggestions on what I should check next, that would be great.

Cheers Damon
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1978 911 SC Complete rebuild, 83 engine, SSi’s M&K Sports muffler.

Last edited by Damon88; 07-18-2023 at 10:35 PM..
Old 07-18-2023, 06:31 PM
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