I was going to post this little question under a new topic in 'ECM' but as it's related to my ongoing problem I shall post it up here.

Apart from showing fault codes, can an OBD1 reader stream any data at all from the Camaro ECM (like a more modern car)?

I have been asked whether it is worth buying one to find my problem but if it just gives fault codes, I may as well do that with the SES light.

Matthew

 

Let me put it this way. My ECM is of the previous generation as yours (yours is a P4, as they call it). If a SnapOn MODIS can connect to my 302 and give live data, it should be able to connect to your 730. Also, you can download TunerPro RT and it will do the same thing with a $50 cable as opposed to a $300+ scanner as well as be able to write new chips for the MEMCAL.

 

Just an update for anyone who might be Googling around with a similar problem

Think what I have here is two problems.

With the old ECM the car idles high or splutters, and makes a lot of fault codes.

With the new ECM the car runs sweet but stalls intermittently. The connector (female) on the car is fine all been crimped up. But if I apply pressure onto the actual connector block on the ECM... I can make it stall or run on demand. So any stress on the connector from the harness is enough to stall it. Must be the joints within the ECM on the connector.

So looks like I need a new-new ecm haha

 

By "crimped up", you mean that each terminal has been removed and re-tensioned?

If so, the next step would be to look for corrosion or debris on any of them. Although if each terminal was removed to be re-tensioned, this should have been seen. There may also be a bad crimp of the wire to terminal. So look at those too.

For the ECM, look at the pins with a strong light. See if any have corrosion or debris on them. They can be cleaned with a toothbrush and mild solvent. And unless water got into the ECM connectors, it is rare for the pins to be bad.

RBob.

 

Unless a solder connection busted loose on the PCB inside the ECM (who knows with a cheap reman). But, yes, I'd check the tightness of each terminal in relation to the pins. And apply a drop of solder to each terminal and wire to make sure of good contact.

 

RBob / Maverick H1L

All the pins on the troublesome connector are in good condition with no corrosion and there is a good quality connection between each pin and the wire on each one.

I had another play today, it seems to get the car to run properly I need to apply fairly firm pressure to the side of the actual connector on the ECM whereupon the car will fire into life and idle smoothly. If I let go it starts to miss and stalls.

So just waiting to see if I can get a new ECM for free