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Well it took some time so here it is.
Readjust exhaust valves after inspection for broken valve springs. I tried to press on the springs, but they seem very firm so I even pushed with a flat screw drive and got no movement. I did not attempt this with too much muscle as I did not want to scar the caps.
After warmup I removed the spark plugs and all but 1 seemed to be fuzzy with carbon deposits-too rich fuel mixture? The one that was not fuzzy (No. 5) was light grey with no sign of carbon deposit. Keep in mind these plugs have only a few hundred miles on them.
Took compression reading as follws:
1-165
2-160
3-150
4-155
5-160
6-155
As I was warming up the engine for the compression test I remove the air box that covers the air stacks. I notice in the #4 air stack a noise that sounds as if the fuel in detonating in the stack. This sound like a loud click. The sound repeats itself every cycle. Is that even possible that the fuel is igniting inside the air stack?
My next adjustment might be to buy hotter plugs and/or adjustment the fuel injector as I still do not have an adequate idle RPM.
Any suggestions.
PHIL
72 911T MFI
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