1990 Chevrolet Lumina Problems
RepairPal has identified the most common problems with the 1990 Chevrolet Lumina based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.
The upper intake manifold gasket and/or a PCV vacuum lines/hoses can develop vacuum leaks with age. This type of leak can result in a higher that normal or rough idle.
The engine temperature sensor wire for the engine temperature gauge, or warning light, may touch the rear exhaust manifold causing a short to ground causing erratic operation of the temperature gauge or warning light.
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.
The high pressure power steering hose will commonly leak fluid; it should be replaced.
The crankshaft position sensor, ignition module, and/or powertrain control module (PCM) may fail resulting in illumination of the Check Engine Light with ignition system related fault codes stored in the PCM. Patience is necessary when dealing with this specific situation as normal diagnostic procedures are not effective. In many cases, the best option is to replace parts, one at a time until the fault is corrected.
The spark plugs should be replaced every 30,000 miles and the spark plug boots should be checked for hot spots and cracks.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.