sputtering under load

[audispaceship]

Hi i have a an audi inline 5 turbo running ms2 v3 basically stock turbo injectors are volvo 350cc (for testing) upgrading later! and I am using the Hall sensor with a 5 window Distributor for my Tach signal. The car is sputtering quite heavy under load on lower rpms but running pretty good after 3000 rpm, i am sure i should fix the sputtering before any further tuning. Here is my Msq and a Datalog.


Thanx


Manny

[Matt Cramer]

It looks like the sputtering may be acceleration enrichment that triggers too easily, causing it to give you too much fuel.

I also noticed your battery voltage is very noisy. How do you have the MS grounded?

[audispaceship]

Mmh I will look into that cuz yes the car is running super rich, but the battery noise is probably comming from my car battery charger that I had connected at the time... Thank you for your help I ll post a new log today afternoon.

[audispaceship]

So i did some work with the car actually changed spark plugs and coil pack and it seemed it is running way better now, there is a lot less sputtering but its still there and do you mean i should play with the acceleration wizzard or the acceleration enrichment threshold rpms. anyways here is an updated datalog from today if you could please take a look at it for me.

[Matt Cramer]

I don't see any obvious problems in your new log other than that the battery voltage is way too low; your AE may have been false triggering from the noise.

[audispaceship]

Mmh I look into that today and I wonder if a capacitor inline with the megasquirt will reduce the noise.

Thanks for the info again

[Matt Cramer]

It might. You'll also want to see why your charging system is only delivering 11.5 volts at 2000 RPM...

[audispaceship]

Alright I finally had some time to spend under the hood and put in a capacitor on the distributors positive and to the ground. Then i was testing for spark output, so pulled a spark plug wire of the spark plug and started to here a puffing sound as if the spark plug was leaking through compresion. Pulled the sparkplug and found the ceramik being loose inside the metal housing. These were brand new 2 weeks ago they werer bosh super spark copper, changed them out and the difference was like day and night;)... ran diagnostics once more for sputtering and its still there, however its alot less noticable.


I appreciate all the help, thank you very much!

here is my latest datalog:

[MrDomino]

Check your battery?

[audispaceship]

The battery maybe a lil old I ll bring it to autozone for a check up cuz its charging fine exept a lil too much sparking when i connect the battery charger. Also my alternator is not charging but only once I rev it to around 3000 rpm which is the same rpm where my car starts reving good i wonder if its the alternator. I have another alternator in my garage I ll have the guys at autozone testing both plus the battery, this way I get closer to the problem. I would never think its a noisy voltage as the car is reving up nicely after 3000 rpm but now it makes alot more sense.