chree

First off, thanks go to Andrew (Camaroholic) from AKM Cables. Great cable, fast shipping.

My problem: Intermittent surging at idle after warmed up. The idle RPM goes up and way down - I'm not sure how low becuase the tach doesn't work yet. The car will cut off if I coast to a stop in 5th or 6th.

Car specs: (I bought the car already converted, see more photos/videos in my sig)

• '86 Volvo 740 Turbo Wagon
• '94 LT1/T56, 16188051 PCM
• Harness and tune (circa '97ish) by Dr. K
• No Mass Airflow Sensor
• PCM sticker lists "NO VATS & SPD DNSTY / 3.73 K73" (the car actually has 3.31 gears)

The PCM has the following DTC codes:

• MALF 11: MIL Lamp Fault
• MALF 13: Left O2 Fail (there is only a single O2 in the right header)

The .uni file I recorded with Datamaster is here. It's just idling and revving in nuetral because the ALDL port is under the hood and I need to find a way to get the cable through the firewall.

Any help appreciated. I have no idea what is going on. I can get more information or datalogs if needed.

Thanks!

Camaroholic

iTrader: (1)

Well, from the looks of the Datamaster file, it looks like the idle rpm is set to 588 RPMs. Yeah, that'll do it. The M6 needs to idle 750-800 RPMs minimum. Do you know if the PCM file was originally for an automatic? The A4 can idle at 600 RPMs, but the M6 needs more. Looks like you need new PCM firmware. Let me know if you need help with that, I can hook you up with an M6 file and all that.

Oh, and you really do need that other O2 sensor...

chree

Unfortunately I know nothing about the PCM programming or the harness. I called the original tuner but got an answering machine.

Yes please! I'll do the reading if you can point me in the right direction.

I could probably add it, if I can get the plug out of the other collector... and I need to find out where it wires into the custom harness.

Thanks!

Ed Wright

iTrader: (1)

Hate to hijack a thread, but Andrew, do you have USB OBD1 cables? I added a card to me new machine here to have a com port, but it doens't work worth a darn. I have to fire up my laptop to do an OBD1 LT1 PCM.

Thanks, Ed

http://www.fastchip.com/Ed-995.mpg

Camaroholic

iTrader: (1)

Hi Ed, yes, I do, and I sent you a PM.

Sent you a PM too, Chris.

chree

Now I have a serious problem, but I'm not sure if it is related to the surging. I had this happen intermittently before but now it seems permanent. The car feels like it is missing several cylinders (with corresponding serious loss of power). It happened yesterday on my commute home and then today on my commute to work. The first thing to do would be to check wires with my inductive timing light to see if I am getting sparks... but someone has borrowed my timing light...

Until I can do that test maybe there is something evident in my Datamaster logs?

Before (disregard the A/T transmission label):

http://chrislindh.googlepages.com/ch...olvo112906.uni

After:

http://chrislindh.googlepages.com/ch...olvo120206.uni

Any help / ideas appreciated. The DTC codes are still "MALF 11: MIL Lamp Fault" and "MALF 13: Left O2 Fail".

Thanks!

chree

Again this morning the car runs fine...

What could cause severe misfiring when the engine is warm?

The opti?

Plug wires??

Gremlins???