Are you getting it from a dealer?
And if it's a SX, then it's definatly a 1.5L engine (carby, yuck).
Redbook says...
1992 MITSUBISHI LANCER
CB Hatchback SX 3dr Man 5sp 1.5i
Trade in price guide* $800 - $1,600
National average price - private sale* $1,500 - $3,300
Price when new (RRP) $17,762
So unless it has really low KMs, $4000 seems a bit pricey.
What do you reckon?