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All of a sudden, it seems like someone pulled a plug wire off and its got a little shake to it. I am sure this has been covered over and over, but I searched and did not come up with it. While testing the Haul Gauge thing, it suddenly starts vibrating. Open the hood and I can see the engine shaking a little, shaking the Ex. It still drives, but with a slight reduction in power, and it seems like one cylinder is dead with the shake a loss of power. No unusual noises or codes thrown. Under the hood, I checked all the CPO and injector plugs and they all are intact. I'm thinking as I have not done it, maybe its time to replace all the COP's and plugs?
Denso is the OEM manufacturer for both the Motorcraft COPs and boots, they are the EXACT SAME parts with a Denso sticker over the MC part number (on the COPs) and they run about half the price of the same MC parts.
Denso boots and springs are #671-0001 for a set of ten.
Denso COPs are #673-6000 for one and they come with a boot and spring.
I'm in the camp of only replacing COPs when they fail, others here will advocate shotgunning all ten. Who is correct? (I don't know, but I do know which one is cheaper ) I know it works for me, I still have all 10 of my factory coils at 127K miles with two brand new Denso COPs carried along in case one ever does drop out while on the road.
I would do the unplug one at a time test to determine which one is toast, then swap it to another hole and do the test again to verify the miss stays with that coil or if it stays at the same position which would point towards a plug or wiring issue there.
Any idea when the plugs were last changed?
Torque pro is a cheap app that can read the mode$6 data. I used it on my last excursion when chasing a misfire. Even if there is no code set for a misfire, the misfire monitor in mode$6 should pick it up and let you know which cylinder is your problem.
I agree not to replace them unless they're bad (unless you just have money like that!). Buy the denso coils and save some money. Any time you change plugs, it's worth changing the boots too.
FWIW, the back plug holes tend to fill up with water and cause a misfire as well. You said it was raining but I didnt catch if it was raining when your problem started. If that's the case, theres a write up for how to fix the seal to keep water out
Torque pro is a cheap app that can read the mode$6 data. I used it on my last excursion when chasing a misfire. Even if there is no code set for a misfire, the misfire monitor in mode$6 should pick it up and let you know which cylinder is your problem.
I agree not to replace them unless they're bad (unless you just have money like that!). Buy the denso coils and save some money. Any time you change plugs, it's worth changing the boots too.
FWIW, the back plug holes tend to fill up with water and cause a misfire as well. You said it was raining but I didnt catch if it was raining when your problem started. If that's the case, theres a write up for how to fix the seal to keep water out
I have the Torque Pro app, will have to look into that mode$6 option?
I've read the mixed comments in the past here about replacing the coils. One or all? I do have a spare that I picked up due to comments here thought.
When I purchased the EX a year and a half ago, it ran great, so did not mess with the plugs, coils, etc. So have no idea when the plugs were changed.
I'm in Miami, where one minute it is bright and sunny and the next it is pouring rain. But the miss started while it was all dry. I was testing the
Open the torque pro app and select real time information
touch and hold anywhere on the background and select add display.
Scroll down and select push button
Then select send OBD command
touch and hold the button to bring up the menu. Select display configuration
select set command to send.
type in 0653 and press OK
Once configured, when you connect to the ECU and press the button you just configured it will enter the mode $06 data screen that has a bunch of info on it. It takes a while to load so be patient. It doesn't list a cylinder 10, it is listed as cylinder 0 if I recall. It's been a few years since I've done this. You have to start the vehicle and it will count the misfires in real time. Drive around for a bit once the menus come up and itll count the misfires on the cylinders. Then you'll have a good place to start looking. If you have an aftermarket coil on a troublesome cylinder, dont even try to replace the boot, just buy a denso coil to put on it. I dont replace boots on aftermarket coils. Not worth wasting the money when more than likely it's the coil. Once you have all denso/motorcraft coils, then when you do a tune up you can replace just the plugs and boots.
All of a sudden, it seems like someone pulled a plug wire off and its got a little shake to it. I am sure this has been covered over and over, but I searched and did not come up with it. While testing the Haul Gauge thing, it suddenly starts vibrating. Open the hood and I can see the engine shaking a little, shaking the Ex. It still drives, but with a slight reduction in power, and it seems like one cylinder is dead with the shake a loss of power. No unusual noises or codes thrown. Under the hood, I checked all the CPO and injector plugs and they all are intact. I'm thinking as I have not done it, maybe its time to replace all the COP's and plugs?
Open the torque pro app and select real time information
touch and hold anywhere on the background and select add display.
Scroll down and select push button
Then select send OBD command
touch and hold the button to bring up the menu. Select display configuration
select set command to send.
type in 0653 and press OK
Once configured, when you connect to the ECU and press the button you just configured it will enter the mode $06 data screen that has a bunch of info on it. It takes a while to load so be patient. It doesn't list a cylinder 10, it is listed as cylinder 0 if I recall. It's been a few years since I've done this. You have to start the vehicle and it will count the misfires in real time. Drive around for a bit once the menus come up and itll count the misfires on the cylinders. Then you'll have a good place to start looking. If you have an aftermarket coil on a troublesome cylinder, dont even try to replace the boot, just buy a denso coil to put on it. I dont replace boots on aftermarket coils. Not worth wasting the money when more than likely it's the coil. Once you have all denso/motorcraft coils, then when you do a tune up you can replace just the plugs and boots.
Thank you for the detailed instructions for Torque. I did as you instructed, started the engine, Torque connected to the OBDII connection, and I pressed the "Send Cmmd" button. Nothing happened. After about 5 min, I decided to drive around a bit. 10 min later, still nothing. What am I missing or do I need to give it more time?
Did you try unplugging one COP at a time while it's running to test if one cylinder isn't firing?
the engine is running rough, with very short burst of running smooth. With Torque running on my phone I pulled #1 Coil plug. The short bursts of smoothness goes away. No change on the Torque display. I plug #1 back in and the short bursts of smoothness return. I pulled #6 Coil plug. The short bursts of smoothness goes away. No change on the Torque display. I plug #6 back in and the short bursts of smoothness return.
I know on my V8 when I have a no fire plug, if I pull a good plug wire the engine runs worse. If I pull the bad plug wire, no difference. This does not seem to be responding that way?
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) I know it works for me, I still have all 10 of my factory coils at 127K miles with two brand new Denso COPs carried along in case one ever does drop out while on the road.
