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1991 Olds 98 Speedometer Surge and Jerking
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Anonymous Poster
donnatms1@aol.com
Jun 30, 2009, 1:20 AM
Post #1 of 11
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1991 Olds 98 Speedometer Surge and Jerking
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My 91 Olds 98 (V6 - 3800) has surging speedometer - up to 100 mph but the car is going about 45-50 when it starts doing this. It also jerks badly. This is occassional occurence and once it settles down the car runs fine. Any suggestions on what might be causing this problem?
Thanks!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 30, 2009, 11:50 AM
Post #2 of 11
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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It could be many things but the most likely cause would be the speed sensor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
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Jun 30, 2009, 11:50 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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My first inclination would be a faulty VSS (vehicle speed sensor). This would cause the eratic speedometer and trans. shifting. See if you can have the trouble code(s) retrieved and post them here. Most parts stores will retrieve them for you. Just don't let them sell you any parts, yet.
Loren
SW Washington
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Anonymous Poster
donnatms1@aol.com
Jul 2, 2009, 12:55 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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Thanks for your help!
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Hammer Time
Ultimate Carjunky
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Jul 6, 2009, 6:15 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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The IAC can certainly cause the stalling problem but I doubt it has anything to do with the speedometer.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Anonymous Poster
donnatms1@aol.com
Jul 6, 2009, 6:23 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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The IAC definitely tested bad and we have one on order and should be in today. We are going to go ahead and replace it. I just wondered about the speedometer doing that while he was testing it. Wasn't sure if some electronic signal or something from it could be causing the speedometer to go crazy while we were testing the IAC.
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Anonymous Poster
donnatms1@aol.com
Jul 8, 2009, 8:26 AM
Post #8 of 11
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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We replaced the IAC and the car no longer stalls but it still does the irratic speedometer surge but it doesn't seem as frequent. Is there any way to test the speed Sensor that you know of?
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Hammer Time
Ultimate Carjunky
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Jul 8, 2009, 9:04 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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Yes, but it requires the use of a lab scope.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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donnatms1@aol.com
Jul 20, 2009, 4:43 AM
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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Just thought I would let you guys know what finally fixed this car. It was the ECM. I talked to my brother who is also a certified ASE certified mechanic and he advised us on how to check the ECM. We replaced it and all is as it should be. Thanks for all the input and your help!
Donna
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Loren Champlain Sr
Veteran
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Jul 21, 2009, 1:24 PM
Post #11 of 11
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Re: 1991 Olds 98 Speedometer Surge and Jerking
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Glad to hear you got 'Christine' up and running. Thanks for letting us know the 'fix'. Have a great week.
Loren
SW Washington
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