Question about 1991 Oldsmobile Cutlass Supreme

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1990 oldsmobile cutlass supreme runs rough has no pwer at all takes a while to get up to speed. have cked all plugs wires all jets are fireing cked coils module. some one metioned about a switch in the transmission but im not sure where in transmission or the wires that go to it.

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  • tc22220001 Mar 17, 2009

    My 1991 oldsmobile idles rough. It may cut off when at a stop light. When moving at the slightest speeds it runs very good and rarely hesitates on an open road. I replaced the plugs and wires, fuel filter, fuel modulator, O2 sensor, and computer. There is no check engine light on. It seems to pass OBD I tests codes.

  • mike loshbough
    mike loshbough May 11, 2010

    Have your Catalytic converter checked.It could be clogged up .No flow no power.

  • FUBAR May 11, 2010

    Hi Randy. I now have seen the additional information you added. Could you clarify which engine your Cutlass has so i would be able to check for service bulletins? The 8th digit in your serial number will give me that data. You mentioned it hesitates intermittently on the highway. When this takes place is it usually on slight acceleration or going up a grade? Have you ever done any checks on the EGR valve?

  • FUBAR May 11, 2010

    Hello Randy. I would like to begin with asking a few basic questions if we could. Is the check engine light on? Is it hard to start when cold or hot? Does your Oldsmobile run rough at all speeds? at idle or on acceleration? Has the fuel filter been replaced? What do you mean by "jets"? If you could answer these questions for me we will begin from there. Thank you. KL

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  • Master
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Hello. I just got the link for this wquestion from one of my fellow experts here at FixYa., via a communication to the Community Manager.

Please allow me to give you some really useful assistance.

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

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  • Oldsmobile Master
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Hi.

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.

Regards.

Ginko.

Posted on Feb 23, 2010

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  • Ginko
    Ginko Feb 23, 2010

    I forgot to mention that you must also check the grounding to PCM module.

    Someone also objected that the EGR valve and vacuum problems will trigger check engine light. I have seen a number of cases where this faults did not trigger the check engine lights (eg mechanically stuck EGR, and leaks).


  • Ginko
    Ginko Feb 23, 2010

    Resuming on the situation, I think the first things to check would be EGR stuck open (poor O2 may go undetected by the ECM, if valve solenoid is good you get no error), fuel pressure problems, bad grounding.

  • Ginko
    Ginko Feb 24, 2010

    Hi.

    Regarding the problem I want to add that there are two questions.

    Answering to the first question, posed by randyscoggin about the 1990 Old. The first thing to do is checking if there are OBD I codes stored.

    Considering the advice given by Toyota Ed, that has see a vast number of cases. Being the MAF sensor a common fault, in that case you will get a mixture that is too lean or too rich, and that will cause the driveability problems.

    Check also compression problems, vacuum and fuel pressure, look for misfire, and read codes.

    About the 1991 Oldsmobile, the user can refer to my previous comment.

    Bye.




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  • Oldsmobile Master
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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

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  • Master
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It could be vapor locking,try losing the fuel cap, it could also be the fuel pressure regulator!!

Posted on Feb 24, 2010

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  • Expert
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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

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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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