Tach reads different than scan tool???
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Joined: Dec 2005
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From: pensacola
Car: Jeep Scrambler
Engine: 350
Transmission: 4L60
Tach reads different than scan tool???
My tach reads different than my scan tool. When checking my 305's engine's vital signs and her temperature this week I noticed the tack on scan tool reads 6 to 700rpm but tach in car reads 1000, what gives???? What would cause this? I did a search and only thing I came up with is that its the nature of the beast with the camaro gages. Can someone tell me how to check it or a schematic of it and I'll try to figure it out. Seems to me tach is bad but figured I'd better ask someone first before I do a "tacharectomy" on it.
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From: pensacola
Car: Jeep Scrambler
Engine: 350
Transmission: 4L60
Just did that and was looking for the capacitor fix for the 82-89 models. Found some folks talking about it but not the actual replacement of it yet. Thnaks.
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From: Westminster, MD
Car: 89 IROC-Z
Engine: 355 TPI
Transmission: 700R4
Keep looking. I know there was a link in one of the older 90-92 tech fix threads to a good wright up for a fix of the older techs, with pics and all.
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From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Care to link...my tach jumps like crazy until you keep the RPMs steady for a couple seconds. Don't know if its the tach or some sort or interference with my MSD wiring...
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From: pensacola
Car: Jeep Scrambler
Engine: 350
Transmission: 4L60
Sorry about the lul' in post's. Been in and out for work and such but here is what I found here. I have not tried it yet but will when things slow down a bit.
https://www.thirdgen.org/forums/elec...tach+capacitor
https://www.thirdgen.org/forums/elec...tach+capacitor
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Tach reads different than scan tool???
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Re: Tach reads different than scan tool???
Joined: Aug 1999
Posts: 5,256
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From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
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From: 212 is up in this Bit@#
Car: Resto-Mod 1987 IROC-Z Clone
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Transmission: My own built/ design 4L80M
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Re: Tach reads different than scan tool???
Not unless you can find Two more Pulses per Engine revolution, to send to the V8 Tachometer (in order for it to read correctly).
Joined: Aug 1999
Posts: 5,256
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From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: Tach reads different than scan tool???
Not unless you can find Two more Pulses per Engine revolution, to send to the V8 Tachometer (in order for it to read correctly).
I used a Dakota Digital signal converter so I could use a V6 tach with my V8 engine !!!
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Dec 26, 2006 10:33 AM