Hello all, Having trouble trying to determine the correct ignition coil part number for my S1 VT Calais with the 5 litre (304). My understanding is that they went to a difference ignition coil in the VT model compared to earlier models which rules out the Bosch MEC718. Any possible guidance would be appreciated.
Try repco or Autobarn website put your number plate in and it will give you the correct parts listings as long as it hasn't been changed.
Called Burson yesterday, girl over the phone said I needed a PAT IGC-009, which is a Bosch MEC726. Now very confused...
As you can see one is a plug in the other has to be nutted down.. The plug in one is what Bursons told you.
I found one of your replies from another thread and you said MEC723? Did you mean MEC726? VT 5.0L Ignition condenser And this is from the following post in that thread. Poster also ran an IGC-009 (MEC726) in what was apparently a VT motor fitted to a VS S3 ute. VT 5.0L Ignition condenser Please advise.
Looks like I gave you some bad advice. My apologies for the confusion. My memory must have been better in 2004 !!! The main difference between the two is that MEC718 uses screw connectors, whereas MEC726 uses a 2-pin Jetronic connector. The VT should have the 2-pin connector so you will need the MEC726. Using a small mirror, you should be able to easily confirm the type of connector used. Edit: The Bosch Ignition Coil Catalogue for 2004 had the following items which is where I got the MEC723 from (obviously a catalogue error since the MEC723 has screw connectors).
Thanks for all the help. A new ignition coil will be ordered shortly. Car's running great, but does sputter a little bit in the morning on the first start-up in very cold temperatures.
Came across the following article today when I was looking for instructions on how to repair a V8 ignition module. Keep it in mind if a new module doesn't solve your problem: Kalmaker 17 April 2015 ยท Are you having problems with your 5L VT with misfiring and / or trouble code 49 for cam sensor???? Replacing the distributor with chinese replacements makes it worse???? Have you ever wondered why the VS Series 3 with the same sequential rollercam engine doesnt suffer from the same problem? ?? Here is the answer The Holden electrical engineering department stuffed up with the wiring harness design on the V8 VT by moving the ignition module even further away from the distributor and also mounting it to the plastic air cleaner box, whereas previously it was mounted to the metal engine bay. The module doesnt need grounding to function but without a proper earth it's asking alot to pull all the signals back to ground within milliseconds. .. The main problem with the harness is, they have all the wiring from the distributor, the coil, and from the module back to the ecu all wrapped in one, and that causes lots of electrical noise. On some cars, just moving this around causes or fixes the problem. To fix it properly the best bet is to relocate the most offending signal wire, which is the brown wire from the module to the negative side of the coil. This circuit also has the tacho wire spliced in, so by removing it you will lose your tacho signal, so there are 2 ways to fix it. The way I prefer, although it probably makes no difference, is to cut the brown wire at the module end approx 50ml from module, and cut a little hole in the rubber boot and poke it through. Then splice, solder and heat shrink a suitable guage wire of at least 15amp and run this wire up around the shock tower to the coil. You can either join this near the coil or if you happen to have correct terminals like I do, replace it. You will notice that on the main harness on the passenger side of firewall there is a little white service tacho plug taped to the thick harness which also has brown wire. If you join to this as well, you get your tacho back. Although this will still send a weak signal all the way back down to where you cut it near the module, it wont create enough noise to upset things. I guess in reality its the same as splicing in near the module instead of cutting the brown wire, and the main noisy load will go direct to the coil This combined with grounding the module will have your chinese distributor working like it is supposed to with no more code 49. Also make sure the noise suppressor is still connected to the positive side of the coil. Most people think its supposedly there for "the" radio interference, but its there for all radio interference including ignition interference. I tuned a very low km VT Senator recently with only 42k on it and it had a slight misfire and it was still using the original Bosch distributor and although the standard harness was being pushed to the limit, it wasn't setting a code. I guarantee that any simple mod like relocating and fitting a better coil would upset things, so I recommend any one with a 5L VT to upgrade this before the problem begins. I would also recommend this mod to all 5L V8's from VN through to VT. You will improve ignition performance better than upgrading to aftermarket coils/dizzys, MSD's etc. Phew... long post..... hope this helps all you and your beloved 5L's
