Obd1

[oblark]

Can I run a OBD1 flywheel with sensor on a M4.4 ecu ?

[t5 pete]

From memory it all depends on what signal the ecu is wanting to receive gav had lots of problems on 4.3 swapping a later fly wheel into his obd1 car and it wouldn't fire correctly.

[t5 pete]

P.s he also tried later sensors which didn't work so ide put money on it to use a later fly wheel if your running 4.4

[oblark]

I've checked the ecu info for both OBD1 & OBD2 and both have a crank sensor output of 825Hz @1.5v

The reason I asked coz I just got hold of a OBD1 engine.

[t5 pete]

That's why I said it's the ecu not the sensors

[Dangerous Dave]

I think the sensors are the same, I read a Volvo tech article not long ago which states that when fitting the later flywheel the wires in the sensor connector have to be switched round (must be a polarisation issue).

My 850 runs M4.4 and has the older flywheel (I think, it's the one with the holes in)

[t5 pete]

I think the sensors are the same, I read a Volvo tech article not long ago which states that when fitting the later flywheel the wires in the sensor connector have to be switched round (must be a polarisation issue).

My 850 runs M4.4 and has the older flywheel (I think, it's the one with the holes in)

Gav tried that with switching the wires but he still had intermittent starting issues and only thing to correct it was to change to the correct flywheel

[oblark]

I think the sensors are the same, I read a Volvo tech article not long ago which states that when fitting the later flywheel the wires in the sensor connector have to be switched round (must be a polarisation issue).

My 850 runs M4.4 and has the older flywheel (I think, it's the one with the holes in)

The flywheel on the engine I've just picked up has holes in the out side of the flywheel and it OBD1

While the flywheel in the 850 has slots and is using a M4.4

[Dangerous Dave]

Hmmm, not sure then. I don't remember reading anything about the crank sensor being an issue on the VS thread (or the m44 wikia) when converting from M4.3 to 4.4

Here is the tech article:
https://www.dropbox.com/s/aze843njd19tns2/Newer%20Flywheel%20Instructions.pdf?dl=0