Re: ‘91 Audi coupe difficult cold starts

[Huw Powell]

It sounds like your engine ECU does not know it is cold.

Which is probably a temperature sender in a coolant line on the engine, 
or its wiring, or even the ECU. Senders can be tested in iced/boiling 
water to see if their resistance changes correctly.

It could also be whatever the ECU uses to run a rich mixture, but that 
is probably just the normal FI system.

- Huw

On 11/17/2019 9:11 AM, Christopher Gharibo wrote:
> When the ‘91 coupe is overnight-cold and the temp is less than about 25 degrees F, the engine will start and stall in one second. This will happen 4-5 times, even when I help with the throttle, gradually improve with each attempt until the coupe eventually fires up and runs fine.
>   
> It’s as if something needs to heat up and I am doing that by the multiple attempts until it finally catches. The colder it is, the worse it gets. It never happens when warm.
> 
> The battery is powerful, changing the fuel pressure regulator made no difference, fuel filter is fresh, injectors are new, there are no codes.
> 
> Please help. This has been happening every winter for years.
> 
> CG
> 
> 
> 
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information
>