Doctor 30 Posted October 2, 2004 Share Posted October 2, 2004 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? Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/ Share on other sites More sharing options...
Doctor 30 Posted October 2, 2004 Author Share Posted October 2, 2004 Oh yes, and now I have cleaned the carbon tip as per instructions from rb20det.com.au Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034450 Share on other sites More sharing options...
Doctor 30 Posted October 2, 2004 Author Share Posted October 2, 2004 Used an expensive multimeter. Now I have 1.1 ohms resistance... Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034535 Share on other sites More sharing options...
MonstaS4 Posted October 2, 2004 Share Posted October 2, 2004 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. Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034690 Share on other sites More sharing options...
Zahos Posted October 3, 2004 Share Posted October 3, 2004 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. Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034899 Share on other sites More sharing options...
Doctor 30 Posted October 3, 2004 Author Share Posted October 3, 2004 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) Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034918 Share on other sites More sharing options...
MonstaS4 Posted October 3, 2004 Share Posted October 3, 2004 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. Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034928 Share on other sites More sharing options...
RBVS Posted October 3, 2004 Share Posted October 3, 2004 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. Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1034934 Share on other sites More sharing options...
Doctor 30 Posted October 3, 2004 Author Share Posted October 3, 2004 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) Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1035206 Share on other sites More sharing options...
RBVS Posted October 4, 2004 Share Posted October 4, 2004 gapping down from factory 1.1 to .8 does the trick when increasing boost. good to see you got the problem fix anyways. cheers. Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1035710 Share on other sites More sharing options...
Doctor 30 Posted October 4, 2004 Author Share Posted October 4, 2004 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 Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1035967 Share on other sites More sharing options...
Doctor 30 Posted October 6, 2004 Author Share Posted October 6, 2004 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) Link to comment https://www.sau.com.au/forums/topic/52505-coil-packs-12-ohms/#findComment-1038772 Share on other sites More sharing options...
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