Please someone help! pulling my hair out
#1
Please someone help! pulling my hair out
Hi folks, I hope there is someone on here who has experienced this issue. I got a 2005 Mercury Grand Marquis that has a miss at idle but runs great on hard acceleration or cruising. I have done the following, New plugs, coils, injectors, intake manifold o2 sensors. cleaned MAF, and EGR valve. I have a miss at idle, I did a power balance test and the IDS shows -20 on cylinders 5,6,7,8 (drivers side bank). No DTCs. Long term trim 1 is +12 and Long term trim bank 2 is -10 I attached the screen shots.
I also unpluged the brake booster and had no effect on idle. I installed a new PCV valve as well. I swapped coils and injectors from side to side as well. the problem did not follow the components.
Idle in gear
Idle in gear
I also unpluged the brake booster and had no effect on idle. I installed a new PCV valve as well. I swapped coils and injectors from side to side as well. the problem did not follow the components.
Idle in gear
Idle in gear
#3
Thanks, Tomorrow if it is not raining, I will go ahead and plug the PCV, and all of the other vacuum ports on the engine with rubber caps and see if it changes anything. Today I sprayed all of the fittings with Either and it did nothing. If plugging off all of the ports, i will borrow a smoke machine from my work and smoke test the intake system.
This may sound stupid but does anyone think a cracked fly wheel could also cause this one bank to be low on power? I know I am grasping at straws at this point.
This may sound stupid but does anyone think a cracked fly wheel could also cause this one bank to be low on power? I know I am grasping at straws at this point.
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