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replaced speed sensor and dash cluster, still speedo broke?


m0sh_man

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at the yard today i pulled two grand prix dashes, one from a 88 SE with digital dash, and one from a 91 LE tried them both on my 91 GTP, well good news is my alternator gauge now works fine, however my speedometer didnt work with either of the dashes, and doesnt work with the original dash,

 

Is there anyway to check to see if my speed sensor is putting out signal?

 

 

what tells the ECM how many RPMS the motor is running?

 

matthew

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I would say your (VSS) sensor was bad. I use to be big into fieros myself their fun cars to drive. I had a 86 SE 2.8 4 speed. If Im not mistaken all the four speeds were Izuzu and the 5 speeds were muncie. Also the 282s getrags are muncies. I didnt know the getrags were muncie till we had to put a clutch in a 89 Z24 at the garage a couple of weeks ago. :D

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that didnt really help me much, but ill tell you this.

 

fiero 85-88 4cyl 5 speeds used an isuzu tranny, 3:35 ratio

84 had a 3:32 or 4:10 4 speed muncie,

 

85-86 4 speed only came in the v6 cars with a 3:65 ratio

86.5-88 5 speed v6 cars came with a 3:61 getrag 282 5 speed (made by muncie)

 

my 3.4L GTP has a 284 getrag.

 

matthew

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