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mike100 · 10-10-2013

The high idle is almost surely the result of a common vacuum leak. there are a couple of tubes under the plenum that are highly likely to be the cause. (Popped off)

The hot coolant temp is classic C4. Probably the radiator is partially plugged. If not with actual garbage and paper, then with fine dirt which can be sprayed off. An aftermarket chip also can address this by commanding the fans to come on sooner. You can also force the fans on with a/c.

I found the early climate controls different than the later ones (like on a 95 C4). keep playing with it- some people report dirty button contacts- these can be taken apart and cleaned.

The LT5 tensioner has become difficult to find new- I bought one two years ago, but the quickest solution would be to see if Marc Haibeck can rebuild yours. new pulleys and bearings are easily bought though- if the spring part isn't bad.

10-10-2013	#34
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: 8 cams are better than four! The high idle is almost surely the result of a common vacuum leak. there are a couple of tubes under the plenum that are highly likely to be the cause. (Popped off) The hot coolant temp is classic C4. Probably the radiator is partially plugged. If not with actual garbage and paper, then with fine dirt which can be sprayed off. An aftermarket chip also can address this by commanding the fans to come on sooner. You can also force the fans on with a/c. I found the early climate controls different than the later ones (like on a 95 C4). keep playing with it- some people report dirty button contacts- these can be taken apart and cleaned. The LT5 tensioner has become difficult to find new- I bought one two years ago, but the quickest solution would be to see if Marc Haibeck can rebuild yours. new pulleys and bearings are easily bought though- if the spring part isn't bad.