Rpm Gauge cutting out when WOT and bumps
 

So I'm assuming its a ground or power issue that I need to locate but I have no idea where to start looking. Does the instrument cluster use one ground? And if so, then why would only the rpm gauge cut out while the speedo was fine? At a loss here...

Try cleaning all your grounds in the engine bay. The one under the throttle body and the one near the brake booster. There is also one under the car somewhere I think. I had a similar issue with my old car.


http://youtu.be/Y33wgKfg3vY

Mine is kinda similar to yours. Except is a lot worse. I cant go over 4k or else it just drops to 0 or if I hit any bumps it drops down. I cleaned the ground under the throttle body and checked all the other grounds I could find yet its still persistent. I don't have any idea about the ground under the car though

Speedo is cable drive, not electronic. Tach gets it's signal from the ignitor, I can't remember where it grounds.

Edit: I see you have a '99...maybe your speedo gets a signal from a speed sensor. Dunno.

Yea its just the tachometer? I tried to look at some wiring diagrams and maybe trace the grounds but I got lost real quick

take the plug out, then put it back. This fixed the problem on my 1991 car. That connector is funky.

Edit for smartphone fail.

Off the back of the instrument cluster?

So I disconnected the plugs from the back of the instrument cluster and plugged them back in but I'm still having the same problems! :vash: Starting to wonder if I buy an external tach if it'll have the same problems...

At around 42 seconds, it looked like a sprayed car without a progressive controller.

Buy an FSM if you plan to keep the car. Worth its weight in gold.

Yea I probably should... Bump for anyone with any ideas! Settings in ms maybe?

The ground that you're looking for runs between the car frame beneath the brake booster and the "trans plate" which mounts between the engine and transmission - the bolt that holds the ground to the trans plate also supports the dipstick tube. The bolt beneath the master cylinder is a popular mounting point for your heat shield, make sure it's tight.

Check cam and crank sensors.

Yup their nice and tight.. Will check cam and crank sensors in a min