i signed up in the hope that some on will be able to help me with my vn calais
firstly my temp gauge and tacho doesne work any idea why?
but i recentally took my throttle body off to replace my thermistat but after i put it back togther there is a really loud screeming noise that i cant pin point and it runs ruff for like a minute on startup????
havnt tried bashing it yet and they only stoped working when i had to get the engine relaced from a wreckers but they did a **** job. i work at holden and someone suggested replacing the thermistat may fix the problem of the temp sensor so i didnt replace the gasket yet. also i srated it before adn went the exhaust when its idleing ruff and it was blowing black smoke and shot quiet alot of water out then smothed out just wanted to see if anyone could give advice till at least i get to work on wednesday lol
The temp and tacho may have the usual fault of the VN instrument cluster; the flexible circuit board at the back. Over time, the circuits in it develop tiny hairline cracks. They create enough resistance to mess with any one of your instruments. It's an easy fix, as the instrument cluster comes out by undoing 6 screws; one under each switch cluster, two just under the dash fascia and two more holding it in place behind the trim.
The temp gauge sensor and fan sensor look identical save for the fact that one has two wires coming out of it, and the other has one. The single wire one being your temp sender. Check to make sure those boneheads didn't damage the sender wire.
I know I'll be corrected if wrong, but some engines run teir tacho from an alternator wire, some run it through the ECM. For the sake of elimination, have a look at all the wires connected to your alternator, and see if there's anything amiss.