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960 runs rough when cold 900 2006

posted by  VolvoWorryWart on  Wed Jan 15 18:40 CST 2014
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last visit: Thu Mar 27 08:27 CST 2014
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Hi,
I have a 1996 960 with 136K which I bought about 2 years ago and for the last 2 winters when it get cold the engine runs rough for first 20-40 minutes when temperatures are below 50F.

It never has a problem starting and base idle is smooth, but as soon as you apply gas to it at about 2000 rpm it is really rough until you drive it for at least 20 minutes than it goes away

I have cleaned the throtle body
One of the power stages was replaced
Coolant temp sensor was changed
Gas filter changed
All 6 coils were changed
brand new spark plug
new AMM

I though it might have a small vacuum leak at exhaust manifold gasket that seals it self as the engine get warmer...........just a theory.......not sure how to test????


Thanks for your help, I'm really lost at what to do now
My other 960 with 195K runs just like a swiss watch

Michael in Georgia

89 760 Turbo Wagon 123K
93 940 Turbo 175K
96 960 Sedan 136K
97 960 Wagon 195K






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