Rshannon81

So I've installed a MSPNP2, tuned and turboed. And at some point about a week or so ago, my tach quit. This was well after the MS was installed. All other gauges work. I've read that grounds could be the cause but I didn't even come close to touching them at any point when it went out. Ideas?

Thanks!

Braineack

iTrader: (62)

it didnt stop working at the install, but after?

Rshannon81

Correct, it was a random thing. I don't know what caused it.

Rshannon81

Anyone? I'm really at a loss here. What wires would I go about checking, and at what voltages?

Braineack

iTrader: (62)

typically when a 1.6L loses the tach, it's because the ignitor is going bad.

Rshannon81

Okay. I know the blue/yellow wire is responsible for the signal. What kind of voltage should I see coming out of the ignitor on that wire?

Braineack

iTrader: (62)

it should be rapidly pulsing to 12v.

it's the pin in the diagnostics box labeled IG-.

put your DMM in diode test mode, and put the red on IG- and the black on GND.

while the car is running, do you hear a solid beep?

Rshannon81

I have a wal-mart special dmm. It doesn't have that function unfortunately. Tomorrow I'll be swapping a known-to-be working ignitor to see if that helps. Yesterday I also tried running a wire from the ms to the tach input and setting it up in ts, but that didn't seem to do anything. So if the ignitor doesn't fix it, new gauge cluster it is.

reip

Raising a dead thread because no solution here and I have the same issue but different.

I have an ecotec swapped NA that's running a GM ECU. After leaving all the dead end wires under the hood and driving the swapped car with no issues for over a year, I decided that this winter would be good to clean up that mess.

Pulled all those old engine management wires through the firewall (holy pain in the ***** of a job) cut the wires and removed the old ECU.

Get everything put back together and the gauge cluster and turn aignals are dead. I turned to the meter fuse and found the fuse fine but the actual circuit not getting 12v power. I jumped 12v from an empty circuit (with a 10 amp inline fuse) and got everything but the tach to work.

On to that..I got a standalone harness with my engine purchase to make install easy, because wires are scary. The standalone harness comes with it's own fuse buss that has a few wires coming off it that needed to be connected to the car. Green wire to power the fuel pump, two blue wires to hook up the fans, a gray wire for the tach and another for the coolant temp sensor. When I did the swap, I tapped the tach wire into the wires leading up to the cluster which provides the tach signal. Got lucky that it's the same as the original tach so it worked fine.

Now I'm at a loss why the tach wouldn't work if it's getting signal and has 12v from the meter circuit. Thoughts? How can I test signal at the wire feed with my dmm? I didn't try that. Also FWIW my bluetooth OBDII dongle reads tach no issues.

reip

Any input here would be appreciated