Speedo movement when not in gear - Maintenance and Repair Forum

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Speedo movement when not in gear
Thursday, June 11, 2009 10:49 AM
I have a 97 z24 automatic with the car in park if you rev engine above 2800 rpm the speedometer will climb to above 35 mph... Any suggestions?

Re: Speedo movement when not in gear
Thursday, June 11, 2009 11:02 AM
don't rev the engine in park.



87 Firebird
All stock...........lol.
Re: Speedo movement when not in gear
Thursday, June 11, 2009 11:07 AM
randizzle wrote:don't rev the engine in park.


haha well said
problem solved?
Re: Speedo movement when not in gear
Monday, June 15, 2009 5:38 PM
Wish it was as easy as that im pretty sure something in the tourqe converter is broke there is a banging in the tranny now...
Re: Speedo movement when not in gear
Tuesday, June 16, 2009 1:38 AM
OK... im going to try and guess on something based off of general automotive knowledge but may not be J-body specific...

Is the vehicle speed sensor mechanically driven or hall effect? Either way there might be something screwed up in the tranny that gives the VSS its reading.... it could be loose or partially broken causing the sound your hearing and when you rev the car it might move enough (from vibrations or whatever) to give the VSS a false reading....


Thats my best guess but hopefully someone that knows the inside of this specific transmission better can help.






Re: Speedo movement when not in gear
Thursday, June 18, 2009 6:25 PM
Thats what i thought might be wrong just gonna have to break down and pull the tranny i guess and check it out
Re: Speedo movement when not in gear
Thursday, June 18, 2009 7:38 PM
Weebel wrote:OK... im going to try and guess on something based off of general automotive knowledge but may not be J-body specific...

Is the vehicle speed sensor mechanically driven or hall effect?


I would guess it to be a variable reluctor.



87 Firebird
All stock...........lol.
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