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

12,505

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.

1 of 1 people found this helpful.
Best Answer Mark helpful

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

12,505

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.

75

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

Your Answer

Cutlass Supreme

Looking for a Used Cutlass Supreme in your area?

CarGurus has 84 nationwide Cutlass Supreme listings and the tools to find you a great deal.

ZIP:

Oldsmobile Cutlass Supreme Experts

  • #1
    munron
    Reputation
    700
  • #2
    tennisshoes
    Reputation
    420
  • #3
    Tom Demyan
    Reputation
    350
View All

Related Models For Sale

Used Chevrolet Monte Carlo
7 Great Deals out of 1,144 listings starting at $1,125
Used Buick Regal
134 Great Deals out of 5,098 listings starting at $2,495
Used Chevrolet Caprice
141 listings starting at $6,995
Used Chevrolet Camaro
371 Great Deals out of 31,504 listings starting at $3,000
Used Oldsmobile 442
52 listings
Used Ford Mustang
342 Great Deals out of 41,799 listings starting at $1,488
Used Chevrolet Impala
483 Great Deals out of 31,772 listings starting at $1,000
Used Pontiac Grand Prix
10 Great Deals out of 2,358 listings starting at $1,900
Used Chevrolet Corvette
113 Great Deals out of 16,308 listings starting at $3,995
Used Mercury Grand Marquis
11 Great Deals out of 1,499 listings starting at $999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.