PCM needed for speedo?
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Joined: Dec 2009
Posts: 127
Likes: 1
From: Huntsville,Mo.
Car: 1989 GTA
Engine: 5.7 /360
Transmission: turbo 350
Axle/Gears: stock
PCM needed for speedo?
I have made the conversion to "non-computer" car and having done my first test drive realized the speedo doesn't work. Any way to have a speedo w/o a PCM on my 89 GTA?thanks
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: PCM needed for speedo?
The '165 ECM used on TPI cars had the speedo (VSS ) signal going to the dash 1st then to the ECM , so removing the ECM should have no effect on the speedo operation
The '730 ECM used on the 90 -92 cars was the opposite ; the VSS signal to the ECM 1st then to the dash
The '730 ECM used on the 90 -92 cars was the opposite ; the VSS signal to the ECM 1st then to the dash
Thread Starter
Member
Joined: Dec 2009
Posts: 127
Likes: 1
From: Huntsville,Mo.
Car: 1989 GTA
Engine: 5.7 /360
Transmission: turbo 350
Axle/Gears: stock
Re: PCM needed for speedo?
Good info right there. So where do I check power to see what the problem is. It should be known the VATS has been jumped in case that is part of the equation. I had to run a manual temp gage and toggle for the cooling as it all went through the computer I was told. The tach works and the oil and amp gages register so I believe they work.
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