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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 21434
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Cadillac Fleetwood (FWD): 1985 CADILLAC Fleetwood. Starts,

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1985 CADILLAC Fleetwood. Starts, fine, runs good. Wont, move forward or reverse unless you floor it. No Slippage, no engine sputtering has power. Also rolls good in neutral. Just need a lot of power just to move. Could it be the catalytic converter is burned up ?

Hello and welcome to JustAnswer!


If the engine is running fine yet it takes a high amount of throttle to get the car to move then either the transmission is slipping, the brakes are stuck or there is a mechanical failure in the trans.


First check the trans fluid to make sure it's full, also note the condition.


If the car does push when in neutral then you've ruled out a mechanical issue with the trans being locked up, and you've ruled out the brakes being stuck.


If it does roll in neutral then the problem is in the transmission. It could be a slipping clutch or low line pressure due to a pump failure, sticking regulator valve or a plugged filter.

sprinkles08 and 9 other Car Specialists are ready to help you
Customer: replied 3 years ago.

Thanks for the prompt and informative reply.

The transmission fluid in the car is extremely clean.


The pump is probably an expensive item.


Is the filter a metal screen ?


Is the regulator valve and option for me to fix. I can drop the pan and change the fluid. Will this give me access to try to resolve the regulator and filter?

The filter is a normal fiber type.


The regulator valve is in the valve body. The valve body would need to be removed and disassembled to get to it and see if it was stuck.

Customer: replied 3 years ago.

Is it possible the Transmission Solenoid is bad ?


Also the regulator is in the valve body, is that exposed when the pan is pulled ?

Yes, the valve body is the large aluminum body that you see when the pan is removed.

solenoids can cause shift problems but couldn't cause what you're having in this case.
Customer: replied 3 years ago.

I did notice one thing with the pan dropped. This transmission has a cable in the front which works freely and seems to engage it. There is a cable on the throttle which seems bound up. It is connected with a set up like a string light you would have in your basement, with the silver adjustment balls. What operates the cable on the front drivers side of the transmission ?

The cable should go up to the throttle linkage at the engine.
Customer: replied 3 years ago.

Any chance it could be the Torque Converter ?

It's possible but unlikely. If the converter failed then it really shouldn't move at all.