Results of Coilpack Conductance Testing

[Markus]

Ok. I tried to measure my coilpacks, but they were all outside the measuring range (max 20 Mohms). I'll have to find another DMM.

[Markus]

Second try, this time with a DMM with a 40 MOhm range.

Results: well, none. All my coilpacks apparently have a resistance larger than 40 Mohms.

[Doug_RS2]

The coilpacks I have in now were measured at around 60Mohms and the ones that I think were causing he problems were > 90Mohms.

I have read elsewhere that cleaning the connections to the power amplifiers helped with some misfire problems.

[Markus]

Well, I finally got my hands on a top of the range fluke DMM, the 189. It has resistance measurement up to 500 MOhms and conductance measurement too.

Did a test on my coilpacks tonight. I was hoping to find one with readings that would clearly differ from the rest...

Not a single one showed up below 500 MOhms on the resistance setting! In conductance mode I got readings between 0 and 3 nS. The readings were however all over the place and seem to be temperature dependent. As the coilpacks cooled down the conductance readings dropped.

Comparing my readings with yours all my coilpacks seem to be fooked. The car still runs reasonably well, with only an intermittant misfire.

This is really starting to piss me off. I don't want to buy 5 new coilpacks (they're damn expensive) to fix a problem that only occurs once in a while...

[Doug_RS2]

It looks like all your coilpacks might be getting to the end of their life if they are high impedance - this sounds possible if they are all original. Can you not find someone else with an S2 and swap for a day to see if it fixes the problem?

[Doug_RS2]

Just thought of another thing - I haven't even tried this yet. I found a website that showed the Power Amplifier Modules(that power the coilpacks) should have a good thermal paste between them and the metal bulkhead - this is to keep them cool. Worth checking - I'll check mine as well. I know I have had one replaced and I bet it never had new paste put behind it.

HTH

[Greg_S]

I am thinking of replacing the short leads from the coils to the plugs as mine look cracked and on there way south . Mine have BMW stamped on the side of them, is this right, i thought Audi and BMW were completely in competition with each other , so why would my car have BMW bits on??? Also does anyone know how much they cost???
Graham

Have you got that BMW part no by any chance?

Greg

[Markus]

OEM coilpacks and HT leads are also available directly from Beru.

Be careful with those BMW HT leads, some of them have a different resistance rating than the stock Audi ones (which are 5 kOhms).

[Greg_S]

Yeah I just wondered how they compared really. I have bought a set of new leads from audi which have helped a bit. Got some 1.8t coils on the way to try.

Greg

[Albert]

Did any of You tried Volvo coilpacks ?

[spiralsmurf]

Doug, this is the site correct? http://mysite.verizon.net/vze6ngsr/S6POS.htm

i would highly recommend doing that. I checked mine this weekend and there's NO paste. After driving around for 5 minutes, they were already warm, so cooling these things down is definitely an important issue.

Albert, you can use Volvo coilpacks?

[spiralsmurf]

by the way guys the spark plug connectors can be purchased from the United States for less than you guys pay there. www.alleurasianautoparts.com has them for $7 USD which is like 4 GBP or less.

[Albert]

Beru or Prenco is better ?

As You can see on the pic, it is posible to use Volvo ones but I don't know the details yet.

[Greg_S]

ive got the 1.8t ones at home now just goto work out how they are connected then can have a try with those.

Greg