Jump to content

Bad missing and dropping 4 cylinders


Recommended Posts

Ive got a mercedes DOHC M119 5 litre V8 being run by a LinkPlus G1, Im having issues with really bad missing under all conditions, i.e both load and cruise and yeaterday while taking the car for a spin I started to drop 4 cylinders, F#CK!. The wires are arcing a little bit but always have, the coils are relatively new HEC 715's, I also have a new 4 channel igniter. I was playing around a few weeks ago with the dwell changing from 3.5 to 5ms as I found that the coil buildup was no where near saturation point, I didnt want to reach saturation because I dont need it to but I wanted to see if more juice would net me any results, didnt notice anything but since thn I started to have a little bit of a miss at around 4500-5000 RPM at speed, dwell has been put back to 3.5ms. I havent changed fuelling and spark or any other parameters, there is no water in the plug bores and the wire surpressors are OK. Have I stuffed the igniter eg. too much current or are the coils stuffed (checked resistance both are close to each other but I dont have the coil specs) Sorry for the rant but Im scratching my head here and will soon push the car off a cliff. Cheers for any help.

Link to comment
Share on other sites

  • 3 weeks later...

Are you running 8 coils?

If so you will need two 4 channel igniters. If you pair the coils to the igniter output each coil only gets half the available current. Resulting in a very week spark.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...