Range Rover Sport Random Misfire

[Jgraymattr]

Looking for some advice. 2012 Range Rover Sport ~85k miles, original Florida vehicle now in Maine. Since the start of cold weather when starting the rover in the morning I randomly get the CEL and when scanned misfire codes indication from cylinders 1 through 8. I have replace the plugs and coil packs and had no issues for several days until yesterday after work when a similar issue appeared (not all cylinders) but still identifying even and odd cylinders, I am thinking it may be the Crankshaft sensor but wanted to verify that my thought process was accurate or should I look at something else?

 

[Rover Range]

Could be anything.
I would try the BG 44K fuel injector cleaner and see if that helps. Use it with a half tank or less. Drive at least 50 miles.

BG Platinum® 44K® Fuel System Cleaner – BG Products, Inc.

www.bgprod.com

 

[Jgraymattr]

Thanks for the reply. I should have mentioned that I did start the process with a recommended fuel injector cleaner following the steps you mentioned prior to changing out the plugs and packs. Once again things ran smoothly for about a week and the random misfires started again.

 

[alldazed]

I’ve owned a 2011 rrs sc for 5 years and it currently has about 125,000 miles on. When I first bought it I scanned it just to see what codes were in. Mine had the random misfires on each cylinder and random misfire first 1000 revolutions so I assumed it hesitated/ misfired during those first 1000 revolutions on each cylinder and logged the codes. I cleared them without doing anything else , checked a few weeks later and all clear. Checked again while scanning for an air suspension issue and they were back. No cel triggered. What may or may not be related is an occasional difficult start in warmer weather- 2-3 times per year - after it has sat for 1-2 hours. It cranks , coughs and splutters and then starts , all one crank but much longer than usual and then runs normally. Wondering if that is more of a fuel / purging problem causing that but pretty sure that would trigger the misfire codes especially as it it says first 1000 rpm.
I had the cel light come on after some obvious misfires while gently accelerating, scanned it and it said MAF sensor so I cleaned them both. Cured it . Felt a very light misfire about a year later but no CEL so I cleaned them both again and been good since.
When I fist bought it the plugs had been changed not long before, timing chain / tensioners had been replaced so I just haven’t bothered chasing it and won’t unless a real drivability problem starts. I put the bg 44k cleaner through it occasionally too.