Okay. After searching til my eyeballs hurt, I've decided toask if any of y'all can help me out with Hermes.
It started when I replaced the stock coil packs with Accel packs from Summit.
About a week later, the ECM threw a P0306 DTC - #6 cylinder misfire.
I checked the plug wire at both ends and they were okay.
I moved the coil pack that controlled #6 and the misfire moved to #2 cylinder - bad coil pack. Called Summit, they sent me a new one,problem solved. For about 4 days.
Threw another P0306 DTC.
Checked plug wires, connected okay. Moved coil pack, no change.
Checked impedance on #6 plug wire, open gap.
Replaced plugs and wires (#6 plug had some build-up on theceramic) with Accel 8mm and NGK Iridiums.
No change.
Replaced Ignition Control Module.
No change.
Checked compression - 185 psi on #6, 168 psi on #4, 150 psion #2 - less than 20% difference across the bank. Acceptable.
Swapped fuel injector #6 with #2.
No change.
Checked MAF sensor by unplugging with engine running.
No change.
My next step is to change the O2 sensor.
If there is no change, I will check the cat. I have not noticed a change in exhaust tone, but I am not the primary driver.
About 3 months ago. I replaced the fuel pump and filter.
Hermes has about 105,000 miles behind him and is driven approximately 20 miles each way to work 3 days a week and 2 miles each way theother 2 days.
About 1 week before, we returned from a road trip to Michigan with an occasional hic on the road, but nothing this bad. The hiccup was similar to the symptom 3 years ago when I needed to replace one of the coil packs, thus prompting me to buy the Accel units (if you have to replace them anyway...)
I'm not sure where to look next.
Any input would be appreciated.
Thanks in advance.
Dave
It started when I replaced the stock coil packs with Accel packs from Summit.
About a week later, the ECM threw a P0306 DTC - #6 cylinder misfire.
I checked the plug wire at both ends and they were okay.
I moved the coil pack that controlled #6 and the misfire moved to #2 cylinder - bad coil pack. Called Summit, they sent me a new one,problem solved. For about 4 days.
Threw another P0306 DTC.
Checked plug wires, connected okay. Moved coil pack, no change.
Checked impedance on #6 plug wire, open gap.
Replaced plugs and wires (#6 plug had some build-up on theceramic) with Accel 8mm and NGK Iridiums.
No change.
Replaced Ignition Control Module.
No change.
Checked compression - 185 psi on #6, 168 psi on #4, 150 psion #2 - less than 20% difference across the bank. Acceptable.
Swapped fuel injector #6 with #2.
No change.
Checked MAF sensor by unplugging with engine running.
No change.
My next step is to change the O2 sensor.
If there is no change, I will check the cat. I have not noticed a change in exhaust tone, but I am not the primary driver.
About 3 months ago. I replaced the fuel pump and filter.
Hermes has about 105,000 miles behind him and is driven approximately 20 miles each way to work 3 days a week and 2 miles each way theother 2 days.
About 1 week before, we returned from a road trip to Michigan with an occasional hic on the road, but nothing this bad. The hiccup was similar to the symptom 3 years ago when I needed to replace one of the coil packs, thus prompting me to buy the Accel units (if you have to replace them anyway...)
I'm not sure where to look next.
Any input would be appreciated.
Thanks in advance.
Dave
