Question about 1991 Oldsmobile Cutlass Supreme
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We see this issue here quite a bit, and, in fact, last week I had an issue identical to yours in my shop.
The vehicle ran rough at times, and had an acceleration issue, as you have described above,
The culprit was the mass air flow sensor. Even when it is not responding correctly, it sometimes will not set a DTC.
The Mass Air Flow sensor is a rather common failure item, and is normally the FIRST thing we check when we see GM products with the mentioned issue. Before you start tracing wires, checking grounds, and generally fooling about with the EGR and the like, I would suggest replacing the Mass Air Flow sensor with a known good unit.
Note: Junkyard units are just that...junk.
Purchasing a junkyard unit will normally results in frustration.
Get a known good one. That should fix you right up.
Posted on Feb 23, 2010
You can easily understand if the problem is related to the transmission, in that case gears will shift too early or too late, and you will feel that the wrong gear is in. In that case check the TPS, as most other tranny problems, will trigger the check engine light. Sometimes a malfunctioning TPS may go undetected. From description it does not look transmission related.
More than transmission, check the vacuum system and the EGR valve. Also ensure that the car has no compression problem. Check for symptoms of blown head gasket. Have a look at the throttle body. Look for vacuum leaks using an hand torch and a pressure gauge. Using the same gauge test also the fuel lines and the fuel pump. Check also lines from gas tank. if they are clogged with debris from gas tank. All this problems may not trigger any error code, and will cause the car running rough when driving.
Other problems like a crankshaft or camshaft position sensor, or troubles related to the parts you already replaced will necessarily trigger engine light, at least because they cause misfire or because faults like the O2 sensor are directly detected by the ECM.
I have restored a good number of vintage cars, but I have never done Olds in real life. Maybe one of my colleagues can tell you more about the specific problem, even if I think most of the troubles are related to some common problem due to use and age of the car.
Posted on Feb 23, 2010
I was just reviewing this problem, ive seen this problem a few times and the first time it drove me crazy,the car would run good when in the shop, long story short i would take a good look at the egr valve, it sounds like the valve is opening to soon or may have some carbon stuck holding it open causing this rough idle, one more thing to checkwould be another common problem that most people over look is the map sensor,this map sensor can cause this problem.
Posted on Feb 24, 2010
It could be vapor locking,try losing the fuel cap, it could also be the fuel pressure regulator!!
Posted on Feb 24, 2010
Have you checked the fuel pressure with a gauge when you have the problem,Have seen a lot of this type of problem from fuel pumps
Posted on Feb 25, 2010
I have same car ,relaced fuel filter,pump,crank sensor,2 fuel injectors,fuel filter. Turned out to be bad conector on the crank sensor.sometime it wouldnt start, or run bad,sometime it would run fine.vibration would move wire.i had it to 3 differnt repair shops.hope this helps
Posted on Mar 14, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
have you checked to make sure the spark plugs were gapped properly for your car
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