The first things that come to mind are: 1. Coolant temp sensor on water pump sending back incorrect voltage to PCM*. 2. Thermostat is sticking or incorrect for your engine.
3. Battery condition and pay particular attention to the Bat. Ground connection at the engine block. It is often the last 2"-3" of cable that fails.
4. Check ignition coil output and ignition (spark plug) wires and replace if they are more than 5 years old.
A diagnostic test performed by a competent shop can save you money by not needlessly replacing parts. A bad PCM *(power control module) or PCM ground connection, can be the cause for inaccurate engine operation, and consequent poor performance. That isn't necessarily your problem, but if a code scanner or diagnostic engine computer could identify it as your source of trouble. So good practice dictates, establishing a base line, getting a correct diagnosis by a knowledgeable tech, followed up with correct repair(s), and that should resolve the issue for you.
Buying unnecessary parts, when the problem may be just a bad connection, would be folly, don't you agree?
All you need is the right repair shop and the money to pay for it, and your IROC Z should be a happy camper, once again. Good Luck :D
Wednesday, July 18th, 2007 AT 2:57 PM