Question about 1991 Oldsmobile Cutlass Supreme

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Where is the low pressure A/C service port on my 1991 Cutlass supreme 3.1L

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The low pressure port is usually on the canister looking piece that has the larger diameter aluminum tubing attached to it.

The quick connector goes on to this round port which sometimes has a blue or black cap on it that unscrews.

Hope you cool off.

Posted on Jul 07, 2010

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1991 olds cutlass supreme


Could be fuel pump. Check for fluctuating pressure.

Sep 02, 2012 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

Where can I locate the A/C low side service port to refill refrigerant?


Both ports are normally close together, on drivers side, looking down between the air filter housing and brake master cylinder. Hard to see, but they are there.

Aug 03, 2011 | 1991 Oldsmobile Cutlass Supreme

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Hi I have a 1991 Olds Cutlass Supreme, with a 3.1 liter engine. My problem is when the car warms at stops it runs rough. Sometimes shuts off. Sometimes when crusing at speeds 30-50 the car sort of jerks...


My 3.4 liter 91 Cutlass Supreme has similar problem when warm the engine misses (car jerks). But its fine at idle and without any accelerator pressure. The SERVICE ENGINE light also comes on intermittantly. I am going to test the ignition coils.

Oct 25, 2010 | 1991 Oldsmobile Cutlass Supreme

1 Answer

Power steering high pressure hose needs to be replaced on my 1991 oldsmobile cutlass supreme, 3.1L engine. However, I am unable to find repair guide.


The end going to power steering pump is easily accessible, however the end connected to the steering system is not as accessible. You will need an 18mm crows foot wrench and a long extension. Or since the line is being replaced anyway, cut the metal part of the hose as close to the nut that screws into the steering as possible so that you can use a deep-well socket on a two foot extension with a swivel. The steering mechanism is located approximately below your break booster and the high pressure line is the one closest to the fire wall.

May 30, 2010 | 1991 Oldsmobile Cutlass Supreme

1 Answer

Hi I have a 1991 Olds Cutlass Supreme with a 3.1 multi port F1 engine and would like to change the fuel filter is it easy to get at or must I take it to a garage any help would be greatly appreciated....


Should be fairly easy. Its towards the back of the car. Most have quick connect inlet and outlets but some u may need a 20mm and 16 mm wrench to take one end off.

May 05, 2010 | 1991 Oldsmobile Cutlass Supreme

2 Answers

Transmission filter and fluid in 1991 olds cutlass supreme


it all depend on the millage, and how dirty the oil is

if oil very dirty it will be worst for your transmission

Apr 01, 2009 | 1991 Oldsmobile Cutlass Supreme

1 Answer

1991 oldsmobile cutlass supreme


Check for fuses/power/ground to the engine computer (or injector drive computer) whatever the case is.

Spark, fuel pump, and starter all are independant of the fuel injection computer.

Either the computer itself has gone bad, or it is not receiving power or ground, or wiring to the injectors might be bad...

Aug 28, 2008 | 1991 Oldsmobile Cutlass Supreme

1 Answer

1991 Oldsmobile Cutlass Supreme


have u checked the fuel filter and check to make sure the sparkplug wires are all correct and the wires for the ignition system ned to be checked also

Aug 02, 2008 | 1991 Oldsmobile Cutlass Supreme

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