Misfiring after ignition conversion

[cotje]

Hi all,

Seperate topic for this specific problem. After changing my ingition setup from single coil to 4 COPs and learning the correct CRIP and Dwell for the new setup, the cars runs and drive good on low boost.

Now the next problem occurs: while driving car runs smooth and strong upon 200KPA (without overboost). If I enable overboost the car misfires shortly for 1 or 2 moments. 1 during boostbuild, the other when boost gets build down.

What to do?
- I will try playing with the sparkplug (NGK BKR8IEX) gap (now 0.7, will try 0.5 as proposed on other forums with these COPs)
- I tried altering dwell from 1.5ms to 3ms but this did not change the behavior

Picture of the sparkplug below. Looks like it's running a little to hot?!


Any other suggestions?

[Sean]

Plugs look more than a little hot, possibly try 10's

[cotje]

Hi all,

After switching plugs for normal types, altering gaps and playing around with the dwell-time I still couldn't resolve the misfire from happening. So, next thought was "what did I change":
- Single coil distributor for four pencoils
- Magnetic SYNC sensor for Hall sensor
- New CRIP index > 450
- New dwell map
- New plugs

After ruling out plugs, CRIP, dwell and coils I figured it must be the Hall sensor losing signal and causing the loss of sprak. And INDEED!! Today I changed the Hall sensor for the old Magnetic sensor and the car ran like before without misfiring

Guess my Hall sensor is defective or should ik use some kind of SYNC Filter for these sensors?