Audi S4 TQ Sedan 1994
Engine code AAN 2.2T
Gearbox 6spd manual
Fuel used: Petrol 98oct (Euro)
Vems PnP box, number 10667 from Mattias.
Firmware 1.2.31
Vemstune 1.5.57 installed on laptop
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Mods:
GT2871R turbo
Bosch 044 intank fuelpump
Bosch 550cc inj
Bosch NTC MAT-sensor
Large FMIC
MAF delete
Coil conversion harness and 1.8T coils.
034 High flow RS2 exhaust manifold
3" custom stainless exhaust turboback.
034 phenolic spacer for intake manifold
034 MLS headgasket
ARP head studs
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Bottom end untouched.
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Trigger info:
Using the original 135 teeth trigger system.
However, the colours on my cables at the crank home sensor connector were opposite of what the info states.
The cables seemed to have been switched earlier, but they were not.
So in my case, red is purple, and purple is red.
With the cables untouched, the "TDC after the trigger" was 43, and many trigger errors.
With the cables switched, the "TDC after the trigger" was (is) 55, and no trigger errors.
When checked with strobe timing light.
So just looking at the wire colours is risky.
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I am in the middle of fine tuning the maps. (Dec 2022)
Car drives fine.
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The only problem right now is that I can't really figure out how to control the IAC properly. (Original bosch 2-pin PWM)
The "lock IAC" feature, and typing in diff numbers to see how it moves, does nothing, it does not move the ISV at all.
In idle hardware settings:
At "Max PWM duty allowed", I can only use 22 as max value.
Above 22, the check engine light starts to glow, and the low oil preassure warning comes on!
If I continue to raise the value from 22 and up, the CEL shines brighter and brighter, and the low oil preassure warning continues.
Have tried with another ISV also, same model.
Both works when bench tested.
I read something about using a diode, would this maybe fix this issue?