Question about 1993 Oldsmobile Cutlass Ciera

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Code 24 vss sensor, already changed out and still shows up .engine surging hard not at all times,stalls out. also got code 26 after replacing vss

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  • might_e_mike Dec 22, 2010

    still having problem, codes 24, 26, and 39.Had it at2 different shops first said it was in TCC. tranny man said there was nothing to cause it to stall while driving. Second only found a vacuum leak and said it fine. It goes in spurts of how much it surges and how hard. Also when i restart it idles 30 -40 mph down the road.5 -10 minutes of this then its fine.some times when I pess the accellerator there no response like its getting fuel. thank you



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Hello Mike.
There a couple of possibilities here.
The sensors on these cars were usually reliable, never had to replace too many.
I suspect a possible worn/broken gear in the transmission where it meshes with the sensor, a broken wire/poor connection or an instrument panel problem.

Here is a test procedure from the manual.
Connect a Scan Tool to the ALDL Connector. Disconnect the Vehicle Speed Sensor connector. Connect a lead between the J38522 Vehicle Signal Generator's red output terminal and the Vehicle Speed Sensor connector terminal A (YEL). Connect a lead between the Generator's black output terminal and the Vehicle Speed Sensor connector terminal B (PPL). Plug the Generator into the Cigar Lighter. Select 30 V P-P sine wave and set the frequency at 600 Hz. Observe the Speedometer and compare it to the vehicle speed shown on the Scan Tool.

  • If both the Speedometer and Scan Tool display approximately the same speed, check for correct tire size, ECM CALPAK and Vehicle Speed Sensor.
  • If the Scan Tool and the Speedometer do not display the same speed, replace the Instrument Cluster.

I hope this helps you towards a repair, thank you for using FixYa.


Posted on Nov 13, 2010


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