Re: [20v] ‘91 Audi coupe difficult cold starts

[Peter Schulz]

Chris:

This sounds like a cold stat issue that happens before the O2 sensor comes to operating temp

Like Peter said, MFTS AND the G62 coolant temp sensor in the head - AND the connector body (pull the boot back and ensure that the contacts are making good contact.)
I and some others found that the the G62 connector body had broken and the pins would make intermittent contact)

-peter

> On Nov 17, 2019, at 9:51 AM, Peter Kirby <4pkirby at gmail.com <mailto:4pkirby at gmail.com>> wrote:
> 
> Coolant sensor (MFTS)?
> 
> On Sun, Nov 17, 2019 at 9:11 AM Christopher Gharibo <cgharibo at usa.net <mailto:cgharibo at usa.net>> 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 
> 
> 
> 
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Peter Schulz
1990 Audi CQ Pearl White
1991 Audi CQ Silver
1993 Audi S4 Black
1995 Audi S6 Cashmere
1995 Audi S6 Avant Silver
2001 Audi A4 Q Black