Speedo read 10 kmh with plug lead off?
Thread Starter
Junior Member
Joined: Feb 2006
Posts: 43
Likes: 0
From: Perth, Western Australia
Car: 87 Trans Am GTA
Engine: 305 TPI
Transmission: 700R4
Speedo read 10 kmh with plug lead off?
Interesting... a couple of times over the last few months I've noticed my speedo jump (digital dash), but it has been too quick to be sure. (Like "did I just see that say XX ?")
Couple of days ago I forgot to reconnect #5 spark plug lead after changing the O2 sensor... when I started the car, the speedo was reading 10 kmh. (I also had a bad tapping noise and got worried for a minute before I realised I'd left the lead off).
How can an ignition problem like this affect the VSS signal... or is it more likely to have been weird voltages affecting the digital dash modules?
Cheers,
Stu
Couple of days ago I forgot to reconnect #5 spark plug lead after changing the O2 sensor... when I started the car, the speedo was reading 10 kmh. (I also had a bad tapping noise and got worried for a minute before I realised I'd left the lead off).
How can an ignition problem like this affect the VSS signal... or is it more likely to have been weird voltages affecting the digital dash modules?
Cheers,
Stu
Thread
Thread Starter
Forum
Replies
Last Post
eightsixseven
Tech / General Engine
2
Dec 16, 2024 01:50 PM
Glowsock
Tech / General Engine
3
Jan 9, 2017 04:06 PM
BurlyChev
Tech / General Engine
14
Aug 22, 2015 01:52 PM