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Speedo issue!

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Old 06-14-2018, 08:57 PM
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Default Speedo issue!

I need help. No one knows what will fix this so far. I have a 1998 Trans Am and I converted from auto to 6-Speed. I used body and engine harness from a stick car. Problem is my speedo reads 50% of what the car is doing. Is this a 98 issue? Was there 2 different pcm’s? I selected manual trans and it just won’t read right.
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Old 06-14-2018, 10:12 PM
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You can recalibrate the speedo in the PCM.
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Old 06-14-2018, 11:48 PM
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In the hp tuner, did you put in the gear and tire size?
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Old 06-15-2018, 12:30 PM
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Yes I set the tire size. I used a scanner and the main issue is the pcm is reading half the speed as well. So the cluster is showing what the pcm is sending it.
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Old 06-15-2018, 12:35 PM
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Change the pulses per mile in the tune.
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Old 06-15-2018, 08:51 PM
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Thanks a ton! All fixed!
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Old 06-15-2018, 09:10 PM
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Originally Posted by Rick Speed View Post
Thanks a ton! All fixed!
NICE!! Have fun!
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Old 06-15-2018, 10:44 PM
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Originally Posted by Rick Speed View Post
I need help. No one knows what will fix this so far. I have a 1998 Trans Am and I converted from auto to 6-Speed. I used body and engine harness from a stick car. Problem is my speedo reads 50% of what the car is doing. Is this a 98 issue? Was there 2 different pcm’s? I selected manual trans and it just won’t read right.
check the speed sensor there could be one for auto tran an other for standard trans
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Old 06-15-2018, 11:32 PM
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Originally Posted by johngrn View Post
check the speed sensor there could be one for auto tran an other for standard trans
Read Post #6 AGAIN. He fixed it!
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