86 cutlass supreme I was told the transmission was not bad but cannot go over 40 on the freeway what can it be

Asked by Dec 15, 2014 at 08:08 AM about the 1986 Oldsmobile Cutlass Supreme

Question type: Maintenance & Repair

5 Answers

11,805

Is the transmission shifting out of low (1st) gear? I believe the 86 cutlass still had vacuum assist and electronic overdrive on the transmission. Make sure the vacuum line is intact going to the transmission. There may be a valve body issue not allowing it to shift out of 1st.

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Best Answer Mark helpful

It switches gears but when on highway is like I have no power at all but thanks for the advice

11,805

Another issue you may be having is a blockage in the catalytic converter. If you have access to a vacuum gauge, check the vacuum on the manifold. Normal vacuum should be around 12-15. If you have a steady drop in vacuum when at idle, that would indicate a blockage in the exhaust system.

That vehicle may have a vacuum advance on the distributor that may be faulty.Check all your vacuum lines on the engine.Starting with the distributor.There should be a vacuum line and emission diagram under the hood or on the cross member above the radiator(rad) . If you don't find the diagram there check online for it.If you have any cracked vacuum lines, replace them.Even the slightest leak can be a headache.

65

My daughter had the same problem of speed not exceding 49 mph. The problem was a clogged catylist convertor.

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