Chasing the multiple misfires
Pro Wrench
Joined: Apr 2018
Posts: 1,516
Likes: 442
From: SE PA
Napa sells singles of all different lengths. This is a pretty economical way of reusing many of your original wires when relocating the coil packs, or doing spot replacements.
Last edited by ahab; Mar 20, 2025 at 10:37 AM.
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Winching
Joined: Aug 2012
Posts: 645
Likes: 258
From: San Mateo, CA
I use OBD Fusion and it will chart fuel trim but you have to select it. The quick way is to go to the Logs menu and on the Graph screen select Menu at the top and then click the chart at the bottom. It will only allow you to pick four items to graph, but you can create multiple charts if you want (a little more complex). Change whatever the selected data points are (Coolant Temp, MPG, whatever) over to Fuel Trims and assuming the truck is running and you are connected, click Start and begin the drive. It should show the data in real time.
I prefer a more thorough approach to this which creates an exportable file and allows you to do a lot more with the data on a computer in Excel. First set up the data collection parameters by going to Settings<>Preferences<>Logging<>Select PIDs<>SAE PIDs. That's where the most important Data Sets are. You'll see multiple options on that list for Short Term and Long Term for the different banks. Make sure Logging Enabled is turned on on the Preferences tab. Once you finish the drive go to Logs<>Files and select the most recent log file from the list (assuming you have older ones), then select Share. You see multiple ways to get the file onto a computer. Open it in Excel and from there you can create graphs of the data. Here's what that can look like.
I prefer a more thorough approach to this which creates an exportable file and allows you to do a lot more with the data on a computer in Excel. First set up the data collection parameters by going to Settings<>Preferences<>Logging<>Select PIDs<>SAE PIDs. That's where the most important Data Sets are. You'll see multiple options on that list for Short Term and Long Term for the different banks. Make sure Logging Enabled is turned on on the Preferences tab. Once you finish the drive go to Logs<>Files and select the most recent log file from the list (assuming you have older ones), then select Share. You see multiple ways to get the file onto a computer. Open it in Excel and from there you can create graphs of the data. Here's what that can look like.
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Winching
Joined: Aug 2012
Posts: 645
Likes: 258
From: San Mateo, CA
@Tony Luna Did you resolve the issue? I'm having some random similar misfires too (hesitation on launch, a wee bit of rough idle) and all related components are similarly in great shape, if not brand new.
Sells and in stock are often two different things ...
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Winching
Joined: Aug 2012
Posts: 645
Likes: 258
From: San Mateo, CA
Victory!!!
I jumped to an incorrect conclusion in saying that the new MAF sensor did not solve the issue because I still had a rough, which I will now call lopey, idle. Been driving all afternoon and no more misfire codes after the new MAF sensor install. Before the new sensor, I would get multiple cylinder misfires within a 15 minute drive - 1,2,3,4,7,8. I did think it was odd that 5 and 6 were not showing up. I must admit, the lopey idle with the new deep exhaust note sounds pretty awesome!
Last edited by Tony Luna; Mar 20, 2025 at 05:48 PM.
Pro Wrench
Joined: Apr 2018
Posts: 1,516
Likes: 442
From: SE PA
Fair enough but if you're planning a coil pack relocate then the chances are pretty good that you're waiting for parts anyway. I thought this might be helpful info for those not aware of this option because I did.
Well I was curious so went to look it up, although they do sell single leads for other makes it does not appear they do for the D2. Good to know they do it for other makes though!
Pro Wrench
Joined: Apr 2018
Posts: 1,516
Likes: 442
From: SE PA
Holy crap. I can’t believe we’re arguing about single spark plug wires. You’re right, they don’t have a Land Rover logo on them if that’s what you’re driving at. You win. Don’t buy this.
https://www.napaonline.com/en/p/BEL780328
https://www.napaonline.com/en/p/BEL780328
Super helpful to know. I had no idea, but looking at a possible bad Cylinder 1 wire that's part of a coil pack relocation kit, so can't exactly order standard wires.
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Winching
Joined: Aug 2012
Posts: 645
Likes: 258
From: San Mateo, CA
Short lived...
Multiple misfires are back. 1,2,3,4,5,7,8. Rough idle. So frustrating!
Ahab, Extinct, I was able to log, but I don't know what I'm looking at. Can I send you guys the files for some advice/input? I'll PM you as well.
Thanks!
Multiple misfires are back. 1,2,3,4,5,7,8. Rough idle. So frustrating!
Ahab, Extinct, I was able to log, but I don't know what I'm looking at. Can I send you guys the files for some advice/input? I'll PM you as well.
Thanks!
