Quote:
Originally Posted by 79powerwagon
So I used a 35-1 tooth tone wheel for a ford application, mounted to the fan pulley (was intended to be temporary)
The tach will read for about 10 seconds then drop to 0. Adjusting Sensor air gap does not change this. Alternator kicks on after a couple seconds and seems to work fine.
ECM not that stupid? Does it really need to see the 60-something windows in order for the tach to function?
Maybe I should have just swapped the cam gear  |
Although it does a couple jobs, that sensor is actually a cam position sensor - meaning it's used for timing. The original 24V cam gear with the windows has one missing window that corresponds with TDC. I believe without that window, the computer is not seeing TDC position and is trying to shut off the engine, hence why the tach quits after a few seconds. Fill in one gap on your tone wheel and you'll be golden.
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98 12v QCSB Sport Package
0 Plate, 4k gsk, 60# Springs
Ported/Polished/Oringed/Studed Head
DFI 5X0.014's, Standard Pump Mods
S300 VNT Turbo, Mechanically Actuated
Home-built trans with goodies 
Borgeson, DOR, Bilstein and Carli Upgrades
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