coil packs 1.2 ohms

[Doctor 30]

My car is missing in high rpm so I thought I'd check the coil packs. They all read 1.2 ohms when you measure as per the instructions

http://www.powerlink.co.nz/~graeme/faq/30.html

As they are all at this level I am thinking there is a chance it is the $20 multi meter more so than the coil packs

I have my dodgy multimeter dial set to 200ohms, is this correct?

Also how do I test the ignitor/amplifier?

[Doctor 30]

Oh yes, and now I have cleaned the carbon tip as per instructions from rb20det.com.au

[Doctor 30]

Used an expensive multimeter. Now I have 1.1 ohms resistance...

[MonstaS4]

Set the meter to the lowest scale possible to get an accurate reading. If you touch the leads on the meter together, you may get a reading on the meter. e.g. 0.4 ohms. This is the resistance of the leads and must be subtracted from the reading you get when you check anything. i.e. 1.1 - 0.4 = 0.7

Anyway, as long as they're all reasonably close, they should be fine. If you're really unlucky, one coil might be going open circuit when under load. If you know any sparkies, they'll have an insulation resistance tester which can pump 500v or 1000v through the coil (as opposed to a multimeter's 2-3volts). This will find very small breaks in the coil which won't show up with a multimeter.

[Zahos]

Did you look at this thread first?

The cracks can be very very hard to spot sometimes. Took me a few minutes of staring at one coil before I found it.

[Doctor 30]

Yep, I did a search on coil packs. I could not see cracks on any of them but three are not original coil packs so it has had problems before (one is off a CA18).

I just checked the multimeter reads .4ohms resistance so they are all .8ohms so they are fine.

Any idea on testing the ignitor with a multimeter?

(BTW its running a little smoother with the carbon tips cleaned)

[MonstaS4]

Pretty sure an ignitor pack is just 6 power transistors. The ecu switches them with a small current which in turn opens and closes the coil circuit. Don't think i'd like to risk testing them though without knowing what else is in the ignitor.

[RBVS]

most common thing is to gap down your spark plugs if its missing (poping) up top.

you prob done that but just thought id say.

[Doctor 30]

Car is running fine now, I cleaned corrosion off the ignitor and cleaned the carbon tips (like I said before) It is pulling all the way to 7000 with out missing and boy does she bang into second gear.

No I haven't, I am far too lazy that even when I had the coil packs off I couldn't be stuffed pulling the plugs out.

What gap should I run in an RB20DET running 13-16.5 psi? (I thought it would be different to RB25DET b/c of the different compression ratios)

[RBVS]

gapping down from factory 1.1 to .8 does the trick when increasing boost. good to see you got the problem fix anyways.

cheers.

[Doctor 30]

Thanks for that! I might have to take it to Calder once I've done it. But then again I am too lazy to check the plug gaps so it probably wont happen

[Doctor 30]

Problem is back but it doesn't happen when you rev out at 75% throttle so it is either plug gap or not enough fuel (I am betting it is fuel as it can ping)