10-26-2022, 12:13 AM
Greetings,
My 1987 turbo coupe suddenly started shifting late, like around 4500rpm in normal town driving. No issues at all prior, car has 115,000 miles...I thought, aha must be vacuum so I replaced the vacuum modulator and fluid and filter. Still exactly the same. The new modulator is adjustable so I turned the screw out probably 6-8 turns and no change. I tested the new and old one with my mity vac and they both hold vacuum and the diaphragm moves. I did remember to reinstall the pin into the new one.
I tried to remove the main engine vacuum line from the intake From the tree, and hook that up to the vacuum line for the transmission ( basically eliminates vacuum to everything else) and still no change. My motor makes 17-18 inches of vacuum at idle.
Anyone have any ideas? Tried disconnecting the kickdown cable and still no change. The car will shift 1/2 manually as soon as you move the shifter, 2/3 is delayed and usually requires you to let off the accelerator, or shift to OD, or be traveling over 45mph
My 1987 turbo coupe suddenly started shifting late, like around 4500rpm in normal town driving. No issues at all prior, car has 115,000 miles...I thought, aha must be vacuum so I replaced the vacuum modulator and fluid and filter. Still exactly the same. The new modulator is adjustable so I turned the screw out probably 6-8 turns and no change. I tested the new and old one with my mity vac and they both hold vacuum and the diaphragm moves. I did remember to reinstall the pin into the new one.
I tried to remove the main engine vacuum line from the intake From the tree, and hook that up to the vacuum line for the transmission ( basically eliminates vacuum to everything else) and still no change. My motor makes 17-18 inches of vacuum at idle.
Anyone have any ideas? Tried disconnecting the kickdown cable and still no change. The car will shift 1/2 manually as soon as you move the shifter, 2/3 is delayed and usually requires you to let off the accelerator, or shift to OD, or be traveling over 45mph