Fuel needle bouncy on 87 IROC
Thread Starter
On Probation
Joined: Apr 2017
Posts: 353
Likes: 0
From: Holly Spring NC
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: T-5 5 Speed
Fuel needle bouncy on 87 IROC
Hey guys...again its me...just trying to get some insight on this. My fuel needle on my 87 IROC is kinda bouncy...not crazy bouncy but likes to dip up and down a tad...any reason for that off hand that you know...bad gauge cluster itself and just gets loose inside where the needle part is maybe? Thanks guys!
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
A Tach Plan
Most aftermarket tachs have a switch that lets you choose the cylinder numbers.
If yours doesn’t you would have to open the tach and experiment due to the fact you didn’t mention the make and model of the tach.
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SPEEDO:
Gain access to the buffer which looks like this:
It’s located behind the instrument panel at the right.
Connect an audio amplifier to terminal A yellow wire to make sure it’s getting a steady signal.
Ground to ground, the signal wire to terminal A yellow wire of the VSS.
With the car on jackstands listen for a hum from the amplifier when the rear wheels are rotating.
If you do, then find out if you get a hum from terminal C tan wire.
The tan wire then goes to the speedometer unit.
If it gets to the speedometer but the speedometer does not work, have it repaired or replace the unit.
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Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
If yours doesn’t you would have to open the tach and experiment due to the fact you didn’t mention the make and model of the tach.
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SPEEDO:
Gain access to the buffer which looks like this:
It’s located behind the instrument panel at the right.
Connect an audio amplifier to terminal A yellow wire to make sure it’s getting a steady signal.
Ground to ground, the signal wire to terminal A yellow wire of the VSS.
With the car on jackstands listen for a hum from the amplifier when the rear wheels are rotating.
If you do, then find out if you get a hum from terminal C tan wire.
The tan wire then goes to the speedometer unit.
If it gets to the speedometer but the speedometer does not work, have it repaired or replace the unit.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
More Bounce 2 The Ounce
Sloshing will cause dipping, but if it dips when you have been stopped for a while the problem is do to a poor connection (hopefully not a bad gage or float).
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can use a loose potentiometer, or you can throw together a quick little panel like this one.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can use a loose potentiometer, or you can throw together a quick little panel like this one.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
Thread Starter
On Probation
Joined: Apr 2017
Posts: 353
Likes: 0
From: Holly Spring NC
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: T-5 5 Speed
Re: More Bounce 2 The Ounce
Sloshing will cause dipping, but if it dips when you have been stopped for a while the problem is do to a poor connection (hopefully not a bad gage or float).
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can use a loose potentiometer, or you can throw together a quick little panel like this one.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
Here’s how to test the fuel gage.
Remove the sender wire going to the gage.
Tape the bare end of the sender wire and put it aside.
Use a potentiometer with a value of 100Ω or the closest you can find.
Connect one end the potentiometer to the gage from the location you removed the sender.
Connect the wiper of the potentiometer to ground.
Turn the key to RUN.
Slowly adjust the potentiometer from 0Ω to 90Ω.
If the gage is bad it will exhibit the problem you have.
If the gage is good it will display a smooth transition from one end of it’s range to the other.
Therefore the problem is with the sender or wiring going to it.
You can use a loose potentiometer, or you can throw together a quick little panel like this one.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
We Keep The Air Wrenches Shiny So They Look Good When We Throw Them Across The Pit Box
Hey thanks a lot! I'll try it when I get back home from training!
Thread Starter
On Probation
Joined: Apr 2017
Posts: 353
Likes: 0
From: Holly Spring NC
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: T-5 5 Speed
Re: Fuel needle bouncy on 87 IROC
O...I also think it only kinda moves around due to sloshing. When I am stopped it rock solid...honestly...and try not to laugh...I feel like this is just kinda a thing with older cars for the needle to move a bit...especially when the tank is at half way??? Like I said I just got the got the car like 2 weeks ago and drove it once...so I'm kinda feeling her out.
Member
Joined: Nov 2005
Posts: 386
Likes: 1
From: Maryland
Car: 1987 IROC-Z
Engine: 5.7 TPI
Transmission: 700-R4
Axle/Gears: 2.73
Re: Fuel needle bouncy on 87 IROC
My car is all original. So I do not have a aftermarket tach gauge. I think I have to change the wires going from the coil to the ignition control module. They are starting to get brittle. That could very well be my problem. But when I am at a stoplight thats when it starts stopped it spike and act up. Or could it be a sign that the coil is on its way out?
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
A Tach Plan
Originally Posted by IROCU2
They are starting to get brittle.
Most of the time the spikes you see is a plug wire which is internally broken that causes arcing inside the wire.
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Happy Racing !
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Make Noise, Turn Left, Repeat