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The only problem area noted with the 92-95 is moderate problems with the timing belt on the DOHC engine and occasional failure of the Idle Speed Control motor. The 92-94 also shows a moderate problem with air conditioning but that is only because up to 94, Diamantes (like most cars) have R-12 Freon and all cars with R-12 Freon get that rating because repairs are expensive due to the cost and scarcity of R-12.
The 96-99 has no problem areas at all.
It is interesting to note that no year of Diamante shows a problem with brakes. This supports the research I did for my Diamonds and Pearls article on brake pulsation which said that the brake problem in a minor occurence that is created by overtightening of lug nuts or improper shop practice during brake repairs.
To check out the Diamante reliability ratings, visit http://carpoint.msn.com/Vip/UsedRelOver/Mitsubishi/Diamante/Used.asp
On page 4-9 there is a diagram and instructions on how to check and replace the motor. It is called the Idle Air Control motor in Chiltons, but it is the same thing as the Idle Speed Control. It is mounted on the throttle body and turns the throttle shaft. The repair procedure in Chiltons is simplified and will get you going. To set up a new Idle Speed Control motor takes the procedure listed in the official Mitsubishi Diamante Service Manual for your year of Diamante. You can order that manual from Magauto (see below), but expect it to cost over $100.
If you need the part, check the price with http://www.magauto.com/mitsubishi.html who sells at wholesale to the public.
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