rough running audi 90 quattro when cold

mattyray · 12-19-2007, 02:24 PM

my 1990 audi 90 20v quattro is a bit sick its running badly at low revs when i get them up over about 3500 it runs fine and then when the engine tem warms up the problem seems to go away? I cant afford to take it to a garage and am hoping the problem is only something minor that i can fix myself with some help has anyone got any ideas as to what my problem could be? should i just go 4 a full service and hope that cures it?

jezza12v · 12-20-2007, 04:35 AM

Sounds like the temperature sender to the ECU has packed up or come disconnected.

mattyray · 12-20-2007, 05:10 AM

cheers jezza! ill look into it think ill have to take it to a garage ill never find where it is as cant seem to get hold of a manual! unless anyone has any suggestions is the part i need called just a temp sender? is it a easy job ect?

jezza12v · 12-20-2007, 07:36 AM

Hi, its simple to do if you know which one it is. Theres normally a few screwed into the end of the cylinder head or block, one feeds the temp gauge, one the oil temp gauge and one the ecu. I'm not familiar with the 20v so can't assist with exact location. By disconnecting them in turn you can usually tell which is which.

12-19-2007, 02:24 PM	#1 (permalink)
mattyray Newbie Join Date: Dec 2007 Posts: 5 Gallery: (0)	rough running audi 90 quattro when cold my 1990 audi 90 20v quattro is a bit sick its running badly at low revs when i get them up over about 3500 it runs fine and then when the engine tem warms up the problem seems to go away? I cant afford to take it to a garage and am hoping the problem is only something minor that i can fix myself with some help has anyone got any ideas as to what my problem could be? should i just go 4 a full service and hope that cures it?

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12-20-2007, 04:35 AM	#2 (permalink)
jezza12v Newbie Join Date: Oct 2006 Posts: 22 Gallery: (0)	Sounds like the temperature sender to the ECU has packed up or come disconnected.

12-20-2007, 05:10 AM	#3 (permalink)
mattyray Newbie Join Date: Dec 2007 Posts: 5 Gallery: (0)	cheers jezza! ill look into it think ill have to take it to a garage ill never find where it is as cant seem to get hold of a manual! unless anyone has any suggestions is the part i need called just a temp sender? is it a easy job ect?

12-20-2007, 07:36 AM	#4 (permalink)
jezza12v Newbie Join Date: Oct 2006 Posts: 22 Gallery: (0)	Hi, its simple to do if you know which one it is. Theres normally a few screwed into the end of the cylinder head or block, one feeds the temp gauge, one the oil temp gauge and one the ecu. I'm not familiar with the 20v so can't assist with exact location. By disconnecting them in turn you can usually tell which is which.

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