It's not a sensor issue. If you have the 3.3L engine, you have the four-speed overdrive computer-controlled transmission. That's what's in my '93 Dynasty. If the computer detects a problem with a sensor, or if it detects excessive slippage between shifts, it will default to "limp-in" mode. This gives you park, reverse, neutral, and second gear. The solenoids are spring-loaded to allow second gear only so you can at least drive to a repair shop. The fact that you're driving it and it's shifting means the sensors are working.
It sounds like insufficient fluid is being pumped at low rpm. There's three possible causes. Low fluid level is the most common, excessive internal leakage causing low pressure is next, and third would be a worn front pump. By activating the right sequence of solenoids, the specialists can determine which clutch pack has high leakage. If nothing they do brings the line pressure up, the pump isn't putting out enough pressure.
When you checked the fluid level, was the engine running? If not, the fluid will drain down from the clutch packs and appear to be overfilled. The engine must be idling and warmed up, then the level is checked after running the shifter through all the gears and stopping in park or neutral. Don't forget to wipe the dipstick off before checking the level. Fluid can spray up on it causing inaccurate readings.
Friday, May 29th, 2009 AT 1:43 AM