Diagnostic Assistance Needed -- 88 5KSQ

[Huw Powell]

Cody's right.  Test that temp sender first, since doing that is free. 
Remove it, bring to kitchen, measure resistance in boiling water 
(carefully) and ice water, compare to graph in Bentley.

On 12/31/2011 6:21 PM, Cody Forbes wrote:
> Unless the non-t is different the MFTS doesn't send temperature to the ECU. The small single pin sensor on the top of the coolant neck does. The MFTS runs the gauge, sends a switched overheat signal to the Autocheck system and sends a switched overheat signal to the A/C to turn it off when the engine is too hot.
>
> I'd look at the differential pressure regulator.
>
> -Cody (mobile)
>
> On Dec 31, 2011, at 4:07 PM, Mike Arman<Armanmik at earthlink.net>  wrote:
>
>>
>>>
>>> 1. Diagnostic Assistance Needed -- 88 5KSQ (b1biker at aol.com)
>>>
>>
>>>
>>> Basic problem - car is almost impossible to start if temps are below 50 degrees and if it does
>>> start it will not respond to throttle inputs until engine has thoroughly warmed up
>>>
>>> I've run the blink code diagnostics and get results that don't follow what is listed in Bentley
>>> crank engine for 6 seconds (or more) - bridge fuel pump relay - code 4444 - bridge fuel pump
>>> relay - code 1111 - bridge fuel pump relay - code 0000 according to Bentley after I get the 4444
>>> code I should get the 0000 code rather than 1111 - it does not have any data relating to any
>>> other codes than 0000 at this point in the diagnostic cycle. In the chart it lists a 1111 code as
>>> indicative of a failure in the ignition/fuel injection control modules and states that the repair
>>> procedure is to replace the ignition control module. If anyone can give me direction as to what
>>> has actually failed and how to proceed it would be greatly appreciated. Gary Meier -- 88 5KSQ, 94
>>> S4
>>>
>>
>> I'd change the multi-function temp sensor (or the plug and/or wiring to it) on the top front of the engine LONG before I started to look at the ECU. The mfts is a common failure, if it doesn't talk to the ECU and tell it "hey the engine is cold, richen the mixture!", the ECU will think the car is already warmed up and set the mixture accordingly.
>>
>> One thing I've finally learned (after 50 years of fooling around with various flavors of machinery) is to look at the cheap, simple, easy stuff first - it is very dramatic to say "the main part failed, it cost $XXX,XXX" but that isn't usually what's wrong and there are no returns on electrical parts.
>>
>>
>> Mike Arman
>> 90V8Q
>> others (ask Cody Forbes!)
>> _______________________________________________
>> quattro mailing list
>> http://www.audifans.com/mailman/listinfo/quattro
>> http://www.audifans.com/kb/List_information
> _______________________________________________
> quattro mailing list
> http://www.audifans.com/mailman/listinfo/quattro
> http://www.audifans.com/kb/List_information
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.1901 / Virus Database: 2109/4715 - Release Date: 12/31/11
>
>