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my thorttle switch was causing my idle to hang sometimes. it would also make the idle return to different RPM's. i removed it.
timing can make the idle too high.
air leaks. water the engine down really good. around all the intake ports. it wont isolate a leak but it wil let you know if you have one. if wastegate is original, check it too. also all the IC connections/turbo.
i would fix the idle problem first. like me, if you have air leaks, doing all that testing of AFR's is meaningless if you have an air leak.
i have 2 sets of brand new gauges. they read .4bar different for system pressure. they read the same for control pressure. dont buy cheap gauges. (i did not think mine were cheap)
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86 930 94kmiles [_ _] RUNNING: [__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
03 BMW 330CI 220K:: [__] RUNNING: [__] NOT RUNNING:
01 suburban 330K:: [__] RUNNING: [__] NOT RUNNING:
RACE CAR:: sold
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