Misfire 1 and 4
 

I have a 99 bonneville that Has new Wires Plugs ICM and a new Coil for 1 and 4 but still have a misfires on 1 and 4 triple checked the order without a scope how do I test the ECM to find if its bad?

Side Note I am Getting spark off the coils and to the plugs so should I be looking towards injectors?

ok so hooked up to the computer watching Misfire count 1 and 4 went crazy for a while. I fluttered the throttle and it misfire count stopped after about 20 seconds i heard a change in the motor and stopped the 3 and 6 started counting up. I read Lean when Idle and rich when fluttering the throttle not even enough to increase RPMS just steady tap on the cable throttle angle stays at steady 1%.

Anyone have ideas?
thanks for your time

Are the misfire counts the same for 1 and 4?

You can take your ICM module into autozone and they can kinda test it, but most of the time when ICM's fail, its when they are hot.

Your fuel trims won't change much while you are in open loop.

Based on what you changed so far, I would check fuel pressure. The fuel pump might be failing.

Fuel Pressure is running between 45 and 52 PSi.

Yes it was 1 and 4 then those stopped and went to 3 and 6.

Once I unplug the TPS all misfires stop but I do still get a super lean on the trims idle sits around 23 STF an 20 LTF


The ICM is new and with it changing from 1-4 to 3-6 i don't think its bad.