VW Turbo VR6 idle problems

[Sharino]

I have been slowing working on getting this car working for last 3 years! get frustrated and leave it for months, please help!

MS3X wired in with sequential, wasted spark.
3.0 VR6 12valve with big turbo and built motor
60# injectors
mild cams
AEM wideband

I never had it running right with batch, just got it running with full sequential, my AFRs are all over the place idling.

Attached log of it idling and MSQ, any advice appreciated, I am still very new to this and trying to read and learn all I can.

thanks!

[grom_e30]

i think it may be the eae thats causing the surge in afr may be an idea to turn that off until you have done a bit more tuning.

[Sharino]

I disabled Well Wetting AE from the 'Accel Enrich Settings', 'Time-based EA' is still on. Is this where you suggested?

I added another log, looks the same to me, I tried putting RPMs around 2,000 to see if AFR fluctuats just as much.

Thanks for your reply!

[grom_e30]

now it seems to be the ego corrections thats chasing its own tail.

[Sharino]

Was getting a bad misfire from a broken wasted spark coil pack. Changed it and it runs a lot better.

Ok, seem to have the idle stabilized a lot better, AFR more constant. Been doing some road tuning, hoping I can get some advice. AFRs are all over the place and autotune is going nuts trying to correct everything. Do I need to turn of ego correction when autotuning? Attached is the msq and a quick log.


Any advice greatly appreciated!

[Paul_VR6]

One thing I notice while analyzing is that the ego correction are lagging by a bit (10-11 records) how far back in the exhaust is the sensor?

Also may be worth turning authority down for now (5%) until things get honed in a little closer.

Other oddity, the AFR swings match up EXACTLY to some dither in the CLT and IAT, could indicate a grounding issue. Make sure your sensor grounds are all going back to the specific ground return wire (and no where else!!) and that the MS is well grounded.

[Sharino]

my wideband is on my exhaust right after the downpipe flange. its about 16" inches from the turbo I would say, I read before not to put it to close to the turbo. Is this too far?

This is my wiring diagram attached, tell me if its bad, yes I know the art work is terrible!

corradoGrounds.jpg

My diagram make any sense?
Basically everything grounds right at a central point on the chassis, right on the strut tower is a bolt, not the strut mounts but on the side of it. Is that ok?

[Paul_VR6]

That is a hot mess.

Chassis should go to battery - or block.

Wideband sensor - and all sensor - should go to a single ms ground wire (blk/wt).

All other ms ground wires should run to cyl head or block.

[Sharino]

Should I moved wideband closer?

ok, i will redo wiring, but just to be clear.

There is approx 5 ground wires coming from the MS3 harness and say another 5 coming from MS3x harness.

The sensors, CLT, throttle position, IAT, wideband, etc, should all go directly to a ground wire from the MS3 harness? Should they each have there own dedicated one or can I use 3 twisted together to all the grounds of the sensors?

Does it matter if they go to MS3 or MS3X harness?

The remaining ground wires I do not use for sensors (MS3X and MS3), just attach to engine.

My revised drawing, this better?

corradoGrounds2.jpg

[dontz125]

That's better. You can run the sensors on one ground wire, or multiple grounds - whichever is easier for you, so long as they all go back to the MS.

The wideband controller should be installed according to its instructions. Most have two ground wires - one for heater power (to the block) and one for signal (to the MS). IIRC, the Innovate LC1 has a single ground; I forget where it's supposed to connect.

[T3Bunny]

Read over several times the information on wiring and grounds in the manuals. THIS IS SUPER CRITICAL TO GET RIGHT. Basically, if I remember how it was described, you disconnect your ECU, all your sensors should no longer be grounded.

The LC1 actually has multiple grounds, (unless they have changed it recently). But they are also very unclear as to what grounds were what on the LC1, and told you to ground them all to the same point. I did. And I "may" be chasing some issues myself because of this.

I need to dig the information out to do some testing on my own stuff, when I get a chance to get to it, I will toss a link out here. Or if somebody has that on hand, please post it! I would try and explain it all better, but the manual really does a VERY good and thorough job of it.

[Paul_VR6]

Close. All your sensor grounds can be tied together to a single ground to the ms main connector. All the other grounds for the mainboard and 3x should go back to the block or head.

For the wideband the heater ground should go to the head or block and the sensor ground should go with the other sensor grounds.

[Sharino]

Ok, i fixed up the wiring and drove it around a bit on autotune. Its getting better but still far away from what I think it should be. Was getting a few bad backfires and pops. Can somebody have a look and please advise! Still unsure why my AFRs are all over the place.

thanks!

[Paul_VR6]

Was that log with autotune on, or after? Post up the current msq if it's after.

[Sharino]

I took the log after running it on autotune for a half hour. Autotune was off when logging. Here is the MSQ

[Sharino]

I think i might have had my spark plugs gapped too much, I re-gapped, ran on autotune for a bit, seems a bit better. Here is a log