1994 Osmobile Silhuette 3800 loss of power when accelerating , ok at normal speeds. Spudders and powerless going uphill and take off changed air filter, had gas tank cleand out and filter replaced.
The age of your vehicle guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers(pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive.
Have you hooked a scanner to the computer and checked the oxygen sensor(s)? If they are bad they could lean out the engine.
Also, a restricted exhaust system can lower engine performance. If you dont know old the plugs and wires are, replace them. With plug wires, its the age not the miles. How old is the coil pack? It could be "breaking down" at higher rpm's. Does your engine have a cam sensor? It would be located where a Distributer used to be on older engines.
Remember an engine needs three things to work properly...Air / Fuel / Ignition(Spark)
MAF sensor if bad, the engine may not even start let alone run.
MAP sensor on most Olds engines is located just behind the rear valve cover. It may have a 3 or 4 wire plug connected and a vacuum line. Its about 1 1/2 inches tall X 4 inches long X 3/4 inch thick.
Hope this helps and good luck!
Aug 10, 2011 |
1994 Oldsmobile Silhouette