Search:

You'll have to provide the files before anyone can start to help...

Unplug the dongle from the car's OBDII port.

Plug the interface to your laptop via the USB cable.

Are you seeing the green LED light up?

Are you able to retrieve license info from the...

What error are you getting?

I wanted to update this thread for those "on the fence" about 1998 PCM's.

It turns out the car was mis-wired from the previous engine swap. The constant battery leads were not connected; rather...

If anyone's keeping track, we're back to the 1998 PCM. Car fires up no problem, so we're dealing with two dead PCM's, and
the vehicle owner is wondering if he wants to try a third (waste another...

Best to post your tune; there's not enough info with just the scan file.

If you can believe it, there is NO spark again today.

All I did was reinstall a few spark plugs, and connect the spark plug wires.

The PCM was MOVED from an accessible location, into the fender...

I'm not too certain about changing it yet. The car has spark now, and until I can verify whether it was the constant voltage, or enabling, "low ref" I don't want to start changing things.

By...

We have spark!

What I did today was connect pins 20, and 57 of the Blue connector to constant power using a 20 AMP fuse holder.
(as you recall from my earlier post, these pins were previously...

That flow profile is wacked for sure; it could use some smoothing between 45 - 5- Kpa at the very least.


My search brings up 60 pound per hour:
...

I would reduce the amount of correction in the underspeed/overspeed tables at first. Try four degrees, or even as low as two degrees (-/+)

Reduce the amount of retard correction, as well as any...

A quick update from earlier today:

- cont. from both coil harnesses to PCM are good (< 0.3 ohms)
- 12.3 VDC with Key ON, and 10.8 VDC while cranking
- reset PCM harness connectors

While...

Yes, the harness has been repinned and checked a few times now.

I've removed the harness from the PCM and will be testing for continuity, and inspecting the pins in general.

When everything...

Figure this out ( a little background first).

2001 LS1 in a 68 SS. Car ran fairly well with 1998 computer, but couldn't get a decent idle after several attempts of editing.

We decided to swap...

It's what the engine wants, not what we think it wants...

Without some sort of dyno/track evaluation between tunes, you really can't be sure what timing curve is best.

You need something to...

My first question is: What are you trying to achieve by advancing the timing? (IE: more power? fuel economy? emissions?)

Next question is, how are you measuring your improvements? Are you...

I don't think anyone is going to stick their neck out without at least seeing a log.

My advice is scan the engine while idling, and keep an eye on the vitals. YOu really can't do much damage at...

Here are some useful links to close out this thread. The short answer is, the sensors are compatible aside from the fuel sender. Someone also suggested knock sensors.
I'll have to confirm whether...

Thanks champ, the fact that you totally ignored the question three times really highlights your ability, and aptitude.

Do you really expect me to rewire the harness, and send back the new PCM...

The cruise_scan file was based on the Trev_verify tune (which was the stock tune).

That was the baseline.

The best start and idle was achieved after several edits. That tune is not...

I'll have to check those files because i definitely tuned the VE, idle tables, spark tables. Even messed with IFR, and MAF.

In any case I've repnned the harness, and new PCM is on the way.
...

The new 2001 PCM will be arriving tomorrow. As far as I'm aware, all of the sensors on this engine are 2001, but the owner cannot confirm.

He did have a different MAF sensor on the motor as he...

I think I'll be replacing the computer, and repinning the harness.

I've read enough horror stories with the 1997-98 computers to sway me, but moreso that we're using a 98 PCM on a 2001 engine...

I thought things were going well after reading through some tips on this forum, and uploading the changes.
Yesterday I went for a test drive which seemed like it would be ready for further tuning.
...

Try reducing the Overspeed spark correction.

If that does not help, I would smooth out the timing tables (high, low, idle/park)


Your scan is showing some huge jumps in timing (upwards of ten...