Question about 1990 Oldsmobile Cutlass Supreme Conv

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1990 Olds Cutlass Supreme 3.1l automatic. Starts fast, but runs very rough and stalls. Fuel pressure at the rail was 45 psi, while the car was barely running. Applying the throttle usually makes it stall instantly. No check engine light comes on. I unplugged the MAP sensor, TPS, IAC, and other one at a time and it made no difference. The engine light came on as each sensor was unplugged. What could be wrong?

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I would check the vacuum hoses to make sure none is leaking, and also the fuel injectors.

Posted on Apr 10, 2011

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My 1990 olds cutlass supreme will not stay running it has fuel and has spark. It will start then dies immediately. Any tips has brand new fuel pump


It could still be a fuel problem. The only way to be certain is to put a fuel pressure tester on it. Autozone may rent or loan fuel pressure gauges. Easy to hook up to the shrader valve on the engine fuel rail and test fuel pressure. With key on, pressure must be over 40 psi, 40-44psi is what is called for. If pressure drops below 40 after it starts, then you know it was a fuel problem. Either the fuel filter is clogged, or the pump quits because the oil pressure switch is faulty. That switch is tied into the pump circuit, keeps the pump running after the engine is running.

If fuel pressure stays good, maybe problem is in the ignition system. Have the Ignition Control Module tested, also the crank position sensor.

Feb 17, 2016 | Cars & Trucks

2 Answers

What makes the fuel pump not kick on on a 92 Oldsmobile Cutlass


There is a red wire close to the battery in the front. It's not connected to anything. Apply positive voltage and that will run your pump for testing purposes.

Dec 08, 2015 | Oldsmobile Cars & Trucks

1 Answer

Cutlass supreme 1990 international series fails


how about the fuel pump you inspect it already ?measure fuel pump pressure for standard value

Dec 05, 2013 | 1990 Oldsmobile Cutlass Supreme Conv

1 Answer

91 olds cutlass supreme runs rough and wont stay idle.


If your vehicle is fuel injected I would say you have a blown fuel regulator. This would cause excess fuel into the cylinders (flooding) causing a miss and coughing and also blow fuel into the air breather. If will also cause the vehicle to run poorly and could cause the vehicle to stall. Also to much fuel on startup can flood the cylinders and cause the vehicle to no start.

Jun 16, 2017 | 1991 Oldsmobile Cutlass Supreme

1 Answer

I have 91 olds cutlass supreme new fuel pump filter fule pressure reulator,new coilpac wiers & pluges but car is still stalling what could it be


i had the same issue and i had 4 injectors that were bad(shorted). i replaced all 6 with rebult ones($400) and its starts right up and been runnin fine for a year now..

Oct 06, 2012 | 1989 Oldsmobile Cutlass Supreme

1 Answer

1991 olds cutlass supreme


Could be fuel pump. Check for fluctuating pressure.

Sep 02, 2012 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

Car starts fine idles rough dies soon as u give it gas replaced fuel filter crankshaft positioning sensor wires running from coil to sensor are not touching and are not broken replaced plug wires and plugs...


If it sat for 3 years the fuel may be in pretty tough shape. If he gasoline smells like a can of old varnish or turpentine then it may have gummed up either the fuel pump, injectors or both. I would start by testing the fuel pressure with a gauge first to see if it is actually pumping enough fuel to run the engine. If the fuel smells bad or your pump isn't working you may need to have the fuel tank removed and cleaned and the fuel lines flushed to get all the old gunky fuel out of them. Also check to be sure you actually have spark at the plugs so you'll know if the ignition system is still working.

Jun 16, 2010 | 1989 Oldsmobile Cutlass Supreme

1 Answer

Just got a 1990 olds cutlass suprime.has the3.1 v6.car has set outside for 1 year and not run.has trasmission leak at the pan.plan on replacing fiter and gasket.how much fluid does it take?car runs rough...


Just changeing the filter and gasket, you shouldnt need much more than 4 liters (1 gal) just keep checking and dont over fill it.

as for the rough running after warm up. could be mass air flow sensor, to test, when car warm, tap the sensor wiht the handle of a screw driver when its running.. if it stumbles or stalls when you tap it. then it needs to be replaced. it could also be coolant temperature sensor, or leaking EGR valve.

Nov 25, 2009 | 1990 Oldsmobile Cutlass Supreme Conv

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