I've been going through the shop manual and I can't find the location of the condenser for the ignition system. I'm T/S a multiple miss fire and I've cleaned the 2 electrical hook ups,pulled all the plugs and cleaned the coils so this is next. I'm guessing it loses it ground when the engine warms up. Thanks for the help

There is no "condenser" like there is in a distributor based system. There are the "ignitor" packs that are located on the valve covers, small boxes with 2 connectors in them, and then the 8 individual coils. I would personally replace all 8 coils and call it done, and if you read previous posts you'll find that's probably the least painful way of handling the situation.

Thanks for the input. Page EC-14 has a condenser shown that is electrically connected to all 8 power transistors and one end of the coil. Also goes back to the ecm through the ECCS relay, im trying to find that one too.

Very interesting, you're definitely correct, my mistake!!! I've never heard of this before, and just for kicks I checked the old Q's. To answer your question, the condenser is on connector F23, and the ECM relay is on connector F66. I'm looking at the wiring diagram on page EC-402. You can see where those connectors are on page EL-508.

Of course, the term condenser and capacitor are synonymous, so really the only thing it's doing is stabilizing the circuit so as the coils are firing there isn't a power drop as they fire.

In any case, if you're tracing a multi-cylinder misfire the most common cause is the ignition coils. They seem to be temperamental, in that they will be intermittent if they're warm or cold. There doesn't seem to be a lot of rhyme or reason.

Thanks for the info. Of course all new coils will get a nice impedance match in that system,but a little T/S ing might work. If the ground is lost with heat cycling on some of these components,maybe they just need to be re attached.

If you figure it out, a lot of people will be very happy! The failure seems to be internal to the coil packs - but if they can be reliably fixed, that would be awesome. They're the big expense failure of that series of Q45...

Heath

I had to go and have the codes read again. Got: po325 knock sens,p1148,closed loop B1,po300 random misfire,p002c undoc code,p00e5 undoc code and po134 H02s1 bank 0ne abnormal. Also told I had 1 dead coil,low side had ohms but the hi side had an open. I don't think this is the complete problem and still chasing other things.

I pulled up the diagram EC14, great by the way, but still cant find the ignition condenser coil. is it called something else on the diagram?

On the 90-96 Q45 it's mounted on top of the valve covers, each is about 2" square.

goody90q45 wrote: ↑

Sun Jul 14, 2019 3:36 pm

On the 90-96 Q45 it's mounted on top of the valve covers, each is about 2" square.

Now I remember those. Right in the center if my menory has not faded completely. Mine never failed.