Fuel Flooding

[Huw Powell]

Brother Bill wrote:

> Huw, is it true that the computer will hold a certain value to keep the
> engine functioning if something goes wrong? 

Not really, no.  If the ECU has wrong or bad inputs, it usually just 
starts doing things wrong in response to them.

> As in my case, either the
> cold start valve or the engine temp sensor. 

Much more likely the temp sender.  Everyone always wants their problem 
to be the cold start injector (because it looks easy to replace), but in 
all my years of driving these things, I've never seen or heard of one 
that was bad.

> It does make sense though
> that if the temp sensor isn't giving the computer an accurate reading it
> would in turn not be able to send the proper mixture to the fuel
> distributor. 

That's why I suggested it.  You can test it - remove it and bring it to 
the kitchen.  Hook up an ohmmeter to it and set it in ice water, it 
should read a couple of kilohms or so.  Then set it in some boiling 
water (be careful) and it should get down into double digits (30-70 ohms 
I think).

>>My '86 Quattro 5 cylinder seems to be flooding itself once it gets at
>>normal operating temperature.  It starts ok when it's cold and runs
> 
> fine
> 
>>most of the time.  Once it gets normal temperature it seems to somehow
>>flood itself by bucking, skipping, backfiring and eventually stalling
>>and unable to start for quite awhile.
> 
> 
> Check the temp sender for the CIS system (usually in the top radiator 
> hose flange).  It is what tells the computer that the engine is 
> warm/cold, so the computer can adjust mixture during warm-up.
> 

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/