Can a vacuum leak cause a transmission to slip?
No vacuum line to the transmission. The transmission can be controlled. A vacuum leak will cause the engine performance to suffer, causing load and throttle position issues which could affect transmission shifting.
What can a vacuum leak cause?
Typically, a vacuum leak will cause situations like hard starting, rough idle, excessive fuel consumption, and engine codes. You might even be able to hear a leak – sometimes a whooshing or whistling sound can be heard with the engine running.
Why is my transmission not working in my Pontiac Grand Prix?
Once the transmission gets warm, it revs engine and shifts hard through 1st, 2nd and 3rd gears. Once a speed of 45mph+ is reached the car is fine. Solution, replacing solenoid and having the valve checked out at as well. Transmission began slipping then stopped pulling in any gear. Diagnosed as the Transmission Pressure Control Solenoid.
Can a bad vacuum modulator cause shift problems?
If you’re experiencing all of the above symptoms while having shifting problems too, then you likely have a faulty transmission vacuum modulator. As you just learned, the vacuum modulator is what allows the transmission to shift properly. Having a bad vacuum modulator will obviously affect normal shifting.
How long does a Pontiac Grand Prix shift hard?
Car shifts hard from 1st, 2nd gear, stops once 40+ mph are reached. Can let the car sit for 2 to 4 hours and it will not shift hard again.
How does a transmission vacuum modulator work?
A lot of people take gear shifts in their vehicle for granted. But every time your automatic transmission needs to shift into a different gear, there is a vacuum modulator inside which ensures that the gear shift can be successfully completed. How Does a Transmission Vacuum Modulator Work? How Does a Transmission Vacuum Modulator Work?
https://www.youtube.com/watch?v=aIzLp9hre98