Mystery plug HELP!!!
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Junior Member
Joined: Mar 2019
Posts: 8
Likes: 0
From: Granville NY
Car: 1985 z28
Engine: 305 4bbl
Transmission: 5speed
Mystery plug HELP!!!
I was doing an oil change on my car (1985 z28 305 4bbl 5speed) and I noticed an orange rubber 3 prong plug. It was just hanging there. I found that plugs in below the rear spark plug on the drivers side above the oil filter, when I go to plug it back in it doesn’t want to go and won’t stay plugged in. I’ve cleaned it with electric part cleaner both on the make and female end. Car seems to run fine without it plugged in but I would like to know what it’s actually for as I JUST bought this car to learn 5speed on so I know next to nothing about it.
Thread Starter
Junior Member
Joined: Mar 2019
Posts: 8
Likes: 0
From: Granville NY
Car: 1985 z28
Engine: 305 4bbl
Transmission: 5speed
Re: Mystery plug HELP!!!
It’s it something that’s okay to drive without? I tried plugging it in after cleaning it but it doesn’t seem to want to stay plugged in or plug all the way in for that matter
Joined: Dec 2004
Posts: 16,753
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Mystery plug HELP!!!
It’s aftermarket, yes it’s ok to drive without. It’s purpose is to warm up the engine on cold days without starting the car.
Joined: Dec 2004
Posts: 16,753
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Thread Starter
Junior Member
Joined: Mar 2019
Posts: 8
Likes: 0
From: Granville NY
Car: 1985 z28
Engine: 305 4bbl
Transmission: 5speed
Re: Mystery plug HELP!!!
Joined: Dec 2004
Posts: 16,753
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Mystery plug HELP!!!
You might want to start a new thread on that. I would maybe service the rear end and see what the gear ratio is. If it or the transmission was changed without the correct speedometer gear installed that would effect the speedometer. Unfortunately the gears are not available. Smaller tire size would make the speedometer faster.
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Thread Starter
Junior Member
Joined: Mar 2019
Posts: 8
Likes: 0
From: Granville NY
Car: 1985 z28
Engine: 305 4bbl
Transmission: 5speed
Re: Mystery plug HELP!!!
You might want to start a new thread on that. I would maybe service the rear end and see what the gear ratio is. If it or the transmission was changed without the correct speedometer gear installed that would effect the speedometer. Unfortunately the gears are not available. Smaller tire size would make the speedometer faster.
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