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Re: ecu goes to open loop at hot idle?
Is your engine light on? I had error 505 (system idle malfunction).
I had something similar but not quite the same. Mine was only a problem when my car had been run hard for a fair amount of time. And my revs would refuse to drop at idle. I tinkered with the air fuel ratio a bit gave it a little less fuel if I recall correctly and found a vacuum line that was unhooked and capped it. You can always try swapping your ISC or check your spark plugs and their gapping but I doubt they are your problem. Idle surge as previously stated by crunchy is a common problem with our cars... If its any consolation its not particularly harmful to your engine.
I wish I could help you more.
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FP 18g turbo e3 o2 & mani, 3" exhaust, , 7 bolt, wiseco/eagle, walbro 255hp re-wired, Aeromotive FPR, FIC 1150cc, injen intake, greddy RS, aem wideband, turbo xs mbc, act 2600 clutch sprung 6 puck, BC 272's, dsmlink v2.5, ETS FMIC, Devils Own, JMF SMIM.
18 Inch chrome rims
In closet AEM Fuel Rail, SS Lines,
1997 TSI AWD
Diamonds Are 4Ever
12.7 @ 107
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