If you can fix this, you may be able to get certified as a mechanic! The likely reason for a good retract, and a poor advance, is the power necessary to do it. Usually retracting is easier than lifting for the motor. You likely have either a worn-out motor, a worn-out folding mechanism (may be called a regulator), or you may even be low on hydraulic fluid. If you do not get a better answer from Fixya than mine, I might suggest you go to a Social Media site and see if other people have had this problem, and what they did to fix it. Although I have not fixed on of these, I would start by checking the hydraulic fluid level, since a leak, and hence a low level of fluid can cause your problem. If it is good, then I would advance the convertible top up and see if you can find the trouble spot by feeling the mechanism's slack. If it has a tight spot at the stopping place, you will know that the mechanism (regulator) has a bent spot or a worn out place. I found used motors on e-bay for your car for less than $ 100, with the hydraulic pump attached. God bless your efforts.
Without knowing what make, model or year I can offer only generic suggestions, the most common cause of this is that the hydraulic pump is low on fluid due to a leak.
Answers & Comments
If you can fix this, you may be able to get certified as a mechanic!
The likely reason for a good retract, and a poor advance, is the power necessary to do it.
Usually retracting is easier than lifting for the motor.
You likely have either a worn-out motor, a worn-out folding mechanism (may be called a regulator), or you may even be low on hydraulic fluid.
If you do not get a better answer from Fixya than mine, I might suggest you go to a Social Media site and see if other people have had this problem, and what they did to fix it.
Although I have not fixed on of these, I would start by checking the hydraulic fluid level, since a leak, and hence a low level of fluid can cause your problem.
If it is good, then I would advance the convertible top up and see if you can find the trouble spot by feeling the mechanism's slack.
If it has a tight spot at the stopping place, you will know that the mechanism (regulator) has a bent spot or a worn out place.
I found used motors on e-bay for your car for less than $ 100, with the hydraulic pump attached.
God bless your efforts.
Without knowing what make, model or year I can offer only generic suggestions, the most common cause of this is that the hydraulic pump is low on fluid due to a leak.