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Engine start very very difficult when cold. I can start the engine only using ether. Once started during warmup I can maintain only using the accelerator. To summaryse a lot of sympthomes makes me suspecting srongly the IAC valve not working properly. This valve was used on my previous engine and mecanically checked. But data in VEMS play an important role and I am now investigating on the VEMS parameters to control well this valve. I recorded log and did initial analysis. I saw that the IAC duty cycle is always 100% I saw a frequency of 200hz and PID of 255, 25, 10. I saw in other config that some are using lower frequency and different values for PID, warmup etc... How to set or get good reference parameters for a quick start of the engine and warmup available for Audi 5 cylinders ? Many thanks in advance. Laurent.
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