equinox 3400 crank sensor

[blander66]

So i have a 3400 out of a 2005 equinox, i know that i need to add a 7x signal to the crank, I also need a 24x signal. Does anyone know if the cranks 24x will work. I have read that the 05 3400 has a 24x sensor on the crank shaft

thanks

[Kaiju Senso]

I installed an 05 Equinox 3400 into my Fiero and ran it with a 98 Monte Carlo PCM. The timing cover still has the bolt holes for a 24x crank sensor so it was incredibly easy to just swap over the crank pulley (with the 24x ring inside of it) from a previous generation 3400 and bolt down a new sensor. Then using the TCE external 7x sensor, and previous gen coil packs it runs no problem.

Here's the setup

[blander66]

I installed an 05 Equinox 3400 into my Fiero and ran it with a 98 Monte Carlo PCM. The timing cover still has the bolt holes for a 24x crank sensor so it was incredibly easy to just swap over the crank pulley (with the 24x ring inside of it) from a previous generation 3400 and bolt down a new sensor. Then using the TCE external 7x sensor, and previous gen coil packs it runs no problem.

Here's the setup

I saw the way you did it over in Pennock's. What i am wondering is can the 24x sensor that is already on the crank be used, this would allow me to not have to add another 24x sensor on the blancer

[Kaiju Senso]

I was under the impression that the Equinox engine did not have the 24x at all. Here is part of an email Darth Fiero (Ryan from Sinister Performance) sent to me when I was asking about it.

According to the GM service manual, the 2005 Equinox’s 3.4L (“3400”) had the new type of crank trigger and ignition system. This system does not use the 7x reluctor and 24x reluctor that older 3400’s used. It has the new type of ignition system where the PCM has full control over firing of the individual ignition coils. Concerning the crank reluctor wheel used in this newer-generation 3400 engine, here’s what the service manual says about it:



The crankshaft reluctor wheel is mounted in the middle of the crankshaft. The wheel is comprised of three 120-degree segments. Each segment represents a pair of cylinders at top dead center (TDC), and is further divided into six 20-degree segments. Within each 20-degree segment is a notch of 2 different sizes. Each 120-degree segment has a unique pattern of notches. This is known as pulse width encoding. This pulse width encoding pattern allows the powertrain control module (PCM) to quickly recognize which pair of cylinders are at TDC. The reluctor wheel is also a dual track, or mirror image, design. This means there is an additional wheel pressed against the first wheel with a gap of equal size to each notch of the mating wheel. When one sensing element of the crankshaft position (CKP) sensor is reading a notch, the other is reading a set of teeth. The resulting signals are then converted into a digital square wave output by the circuitry within the CKP sensor.

[blander66]

I was under the impression that the Equinox engine did not have the 24x at all. Here is part of an email Darth Fiero (Ryan from Sinister Performance) sent to me when I was asking about it.

huh, i had read that they used only a 24x signal, i guess i will just have to pull the oil pan to verify what the wheel looks like

[bszopi]

It has a 24x trigger internal, which is described in the 2nd paragraph of Kaiju's post. It is not a signal that the PCM will be able to interpret as a normal 3400 24x signal.

[bob442]

So simply enough you have to just swap the harmonic ballancer with a older version, and bolt on the sensor, and then get the TCE 7x dealy, kinda seems like a pain in the ass to just be running a 3400

[Kaiju Senso]

It's not "just" a 3400. It is essentially a factory 3400/3500 hybrid motor. The part numbers on the heads are the same as the 3500 for example. Plus it has the new returnless fuel system stock. I am curious though why they made it a 3400 for the Equinox and not just a 3500. If I ever have to tear down the motor (to perhaps upgrade the bottom end, my motor is brand new) I'll make some notes of what's inside for everyone here.

Oh, plus the old 3400 harmonic balance is smaller then the stock Equinox crank pulley so you're essentially bolting on an under drive pulley. Not sure about the weight difference though.

[blander66]

It's not "just" a 3400. It is essentially a factory 3400/3500 hybrid motor. The part numbers on the heads are the same as the 3500 for example. Plus it has the new returnless fuel system stock. I am curious though why they made it a 3400 for the Equinox and not just a 3500. If I ever have to tear down the motor (to perhaps upgrade the bottom end, my motor is brand new) I'll make some notes of what's inside for everyone here.

Oh, plus the old 3400 harmonic balance is smaller then the stock Equinox crank pulley so you're essentially bolting on an under drive pulley. Not sure about the weight difference though.

That is correct the equinox 3400's are unique. The reason i am using it is because the motor was free to me and has almost no miles. My motor came off the line the same day as Kaiju Senso's

[Kaiju Senso]

Gotta love free near zero mile engines

[HOYS]

The LNJ uses the same ignition system as an LX9. Treat swapping a LNJ the same way you would a LX9.