Trigger Points

Hi Peter,

it is one of the reasons why I check repaired trigger contacts on an ignition distributor test stand. I am eager to see the symmetric 90° between all 4 contacts but also eliminate errors like

• contact issues like oil and dirt on contacts - I had to disasselble complete T.C. with transparent covers when I noticed a contact resistance. Since then I clean them before assemblng
• swapping upper and lower contacts erroneously while soldering them back to connector inside
• contact problems on connector outside and wires
• loose parts inside like rivets or screws so that t.c. can move
• This connector is especially often broken on grommet outside. I very seldom see a clean one.

So I feel much more confident when I do the live test. Of course I use Norbert's tool to pre-align them.

Hi all,
Just an update I went out and "mapped" the ignition points on the distributor to the opening/closing of the trigger points ( I don't think it has anything to do with my present problem) but all the ignition points (bar the green #14) are exactly the same as the closing (impulse) of the trigger contacts. I thought they had to be roughly 15° before spark??? I am wondering, and I'm not sure if this is possible, whether the guy who refurbished my distributor (and again I don't even know if it comes apart) may have split the shaft and put it back together out of its original alignment.???? I also checked the corresponding injector leads for voltage and there was none. I'm sorry about the quality of my drawing and the colours on it match the coloured wires at the trigger points. Someone replaced the original. I really am grateful for all the help you guys give and enjoy working on the old girl - bit like a 1000 piece jigsaw puzzle -sometimes with 1 piece missing .

Hi,

closing time of ignition contact determins dwell and thus charing of ignition coil. That is not the ignition timing. That is determined by rotor to cap.

Hi,

I do not want to open one of my T.C.s to verify color.

If your sequence does not fit, ECU will ignore contacts due to expecting them in right sequence.

Hi all,

I think I found the issue . The Yellow/Red wire in the connector from the ECU had broken off # 21 and I assume this effects its partner Yellow/Blue #22 as well ??? I haven't fixed it yet but I'm hoping all is good??? I'm wondering whether I shouldn't change the connector whilst I have it off??? Thanks you all for your input - although I don't understand every detail I like the learning experience.

Thanks
Peter

PS. All good except I found that #1 cylinder is not firing. Is it possible to have a faulty injector that still shows a resistance? O'h and I'll check the compression. leads and plug tomorrow. Enough for 1 day.
Thanks again.

Hi Peter,

if 1 contact does not fire then it can happen that the next following contact is ignored. ANd yes an injector can have resistance and still not open. Touch them while enigne runs and you will feel a tick if it operates.