tach doesnt work...
03-30-2010, 09:41 PM
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tach doesnt work...
tachometer doesnt work it moves when first starting up but then stays all the way to the right past 7000 rpm... also gas gauge doesnt work, ran out of gas at a quarter of the tank the other day. what can i do thanks
03-31-2010, 09:29 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Engaging Discussion
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the removed sender wire so it can’t short.
Connect a 47Ω resistor to the gage where you removed the sender wire.
Connect the other end of the resistor to ground.
Turn the key to RUN.
If the gage is good it will read about ½ way.
So, if the gage is good, you know the problem is the sender or the wiring going to it.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
Remove the sender wire going to the gage.
Tape the removed sender wire so it can’t short.
Connect a 47Ω resistor to the gage where you removed the sender wire.
Connect the other end of the resistor to ground.
Turn the key to RUN.
If the gage is good it will read about ½ way.
So, if the gage is good, you know the problem is the sender or the wiring going to it.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
“After The Fourth Barrel Roll I Lost Control Of The Car”
.
“After The Fourth Barrel Roll I Lost Control Of The Car”
.
04-06-2010, 08:18 PM
#3
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Location: Saint Louis, MO
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Car: 1992 Z28 Z03
Engine: 350 TPI
Transmission: AT
Axle/Gears: 3:73
Re: tach doesnt work...
I have similar issue - Tach "kinda" works, as in fluctuates, but at cruising it goes straight to 7000+ rpm's and stays there. Gas gauge works though. I'm trouble-shooting it now, will let you know of any findings. 1988 IROC TPI
04-07-2010, 03:31 PM
#4
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Car: 1984 Firebird (89 Formula Clone)
Engine: 357
Transmission: m29 T56
Axle/Gears: 3.27 9 bolt Borg Warner.
Re: tach doesnt work...
I also have this same issue, my tach is stuck at 7k, and the only gauge working is my battery, and possibly gas i have no clue yet
04-12-2010, 11:29 AM
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
RPM Mayhem
There is circuitry in the dash near the tach.
It’s contained on a small plug-in PCB or integrated in the main board.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder the potentiometer, measure it and install a matching resistor.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
I’ve NEVER Hit The Wall - (The Safer Barrier Prevented It)
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It’s contained on a small plug-in PCB or integrated in the main board.
On the PCB you’ll see a resistor chip.
Desolder pins 4 & 10.
Use a 500K potentiometer.
Solder it across traces 4 & 10.
Move the potentiometer to half way.
Start the engine and compare the tach reading with a test equipment quality tach.
Dial it in, unsolder the potentiometer, measure it and install a matching resistor.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
I’ve NEVER Hit The Wall - (The Safer Barrier Prevented It)
.
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04-24-2014, 11:22 AM
#9
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Location: Raleigh
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Car: 1989 Iroc Z 5.7L
Engine: 5.7L
Transmission: T56
Axle/Gears: built 4.10s
Re: tach doesnt work...
If you need a tach fixed, contact gcj280, Greg fixed mine and I was help with his service.
04-24-2014, 11:32 AM
#10
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Car: 1989 Camaro RS
Engine: 305 TPI
Transmission: 700R4
Re: tach doesnt work...
The tach problem is caused by a Resistor going bad. There is a really helpful thread about it here;
https://www.thirdgen.org/forums/elec...meter-fix.html
https://www.thirdgen.org/forums/elec...meter-fix.html
04-24-2014, 12:16 PM
#11
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04-24-2014, 01:34 PM
#12
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Car: 1989 Camaro RS
Engine: 305 TPI
Transmission: 700R4
Re: tach doesnt work...
Lol, I didn't even notice the date on the original post. It showed up in my recent topics that's why I commented on it.
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