Question about 1991 Oldsmobile Ninety Eight

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Where is the PCM located on a 1991 Oldsmobile 98 Regency elite?

My 98 gave me problems stalling upon deceleration. I took it to a guy who ended up throwing parts at it and not fixing it so i broke down and took it to a GM dealership for analysis. They told me the PCM needed to be replaced. I'm not really trying to pay $700 for the labor for a part I can get for a fraction of that. What i need to know is where is the PCM located? I just want to get to it and get it replaced! Thanks!

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The PCMor powertrain control module is only on 1996 and newer cars.Earlier models have a ECM or electronic control module/pcm.You want to change the ECM if its a 1992.Its located under the right hand side of the instrument panel.The ecm has a prom( programmable read only memory)in it.You will need to remove this from the old ecm and install in the new ecm.The ECM/PCM can be used in many different GM vehicles but the prom is very specific and must be used only in the vehicle it was designed.The prom will not come with the new ecm and must be carefully removed and installed on the new ecm.There also is a CALPAK in the ECM ( A devise for fuel delivery) This may come with the new ECM But make sure all parts are the same.You should get a vehicle repair manual to do this job correctly,and make sure you do not damage your PROM.Your PROM is very IMPORTANT!

Posted on Jul 05, 2009

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http://www.fixkick.com/Jeeps/ASD.html


if the CEL lamp comes on driving < NOT STALLED)
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but errors still in effect are stored and you can in fact
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I have a 95 oldsmobile 98 regency elite I cant find where the knock sensor goes I have a haynes manual but where it shows it wont go


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I'll just go with what you said last: 1995 Oldsmobile Regency Elite (Two engine possibilities)

If you have the 3.8L Supercharged engine (VIN CODE "1") it is on the left side of the engine near the oil filter.

If you have the non-supercharged 3.8L (VIN CODE "K") there are TWO of them. One is near the oil filter and the other one is in about the same location on the other side of the engine block.

Please also note that MOST fault codes for knock sensors are not caused by the knock sensors themselves. (they do fail, but it is very rare.) Usually there is either a wiring problem to the knock sensor, or the engine has internal problems causing a "knocking" or "ticking" noise which causes the engine computer to "think" that there is a problem with pre-detonation causing an "ignition ping". The code sets when the computer has retarded the ignition timing as far as it can and the "knock" or "ping" does not go away....usually it doesn't go away because it is not caused by ignition timing. The knock sensor is just doing its job and reporting the knock. It does not know the difference between a knock caused by ignition and a knock caused by internal engine problems.

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