2005 ML350 misfire was 1 cylinder now 3 cylinders
Thread Starter
Newbie
Joined: Dec 2024
Posts: 4
Likes: 1
2005 ML350 misfire was 1 cylinder now 3 cylinders
2005 ML350.
Had a misfire cylinder 1, I swapped over the plugs and wires to cylinder 4 to see if it followed to rule them out, I did put 1 new plug in because AutoZone didn't have the ones I wanted in stock so I had to order them. But one of the ones i had pulled out looked like the previous owner had stripped it and I didn't want to risk putting in back in and not being able to get it out,
It ran worse than it did before, But the misfire moved to Cylinder 4. Moving the wires back to cylinder 1 to see if it was the plugs it started to miss on 1 and 4. Then randomly cylinder 2 started to have a misfire which I hadn't touched.
So, will replacing only 1 plug on a cylinder cause more issues?
Not sure why 3 cylinders are now misfiring, My buddy thinks I need to touch the terminals to reset the computer.
Had a misfire cylinder 1, I swapped over the plugs and wires to cylinder 4 to see if it followed to rule them out, I did put 1 new plug in because AutoZone didn't have the ones I wanted in stock so I had to order them. But one of the ones i had pulled out looked like the previous owner had stripped it and I didn't want to risk putting in back in and not being able to get it out,
It ran worse than it did before, But the misfire moved to Cylinder 4. Moving the wires back to cylinder 1 to see if it was the plugs it started to miss on 1 and 4. Then randomly cylinder 2 started to have a misfire which I hadn't touched.
So, will replacing only 1 plug on a cylinder cause more issues?
Not sure why 3 cylinders are now misfiring, My buddy thinks I need to touch the terminals to reset the computer.
MBWorld Fanatic!
Joined: Jun 2014
Posts: 1,086
Likes: 443
From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
You haven't mentioned if you've scanned it for codes but I assume you have to work out which cylinders are misfiring. Check all your connections very carefully as these acars are old and the connectors can easiky have corroded. Same goes for fuel injectors. Any other codes at all?
Have a good look at the spark plug wires and maybe add some dialectic grease so they don't short out.
What are your O2 sensors saying?
Have a good look at the spark plug wires and maybe add some dialectic grease so they don't short out.
What are your O2 sensors saying?
Thread Starter
Newbie
Joined: Dec 2024
Posts: 4
Likes: 1
You haven't mentioned if you've scanned it for codes but I assume you have to work out which cylinders are misfiring. Check all your connections very carefully as these acars are old and the connectors can easiky have corroded. Same goes for fuel injectors. Any other codes at all?
Have a good look at the spark plug wires and maybe add some dialectic grease so they don't short out.
What are your O2 sensors saying?
Have a good look at the spark plug wires and maybe add some dialectic grease so they don't short out.
What are your O2 sensors saying?
Junior Member
Joined: Sep 2023
Posts: 65
Likes: 8
From: NC Mountains
2000 ML 320/95 Ford F150 4x4/Harley Davidson 03 FLHRCI in vivid black
2005 ML350.
Had a misfire cylinder 1, I swapped over the plugs and wires to cylinder 4 to see if it followed to rule them out, I did put 1 new plug in because AutoZone didn't have the ones I wanted in stock so I had to order them. But one of the ones i had pulled out looked like the previous owner had stripped it and I didn't want to risk putting in back in and not being able to get it out,
It ran worse than it did before, But the misfire moved to Cylinder 4. Moving the wires back to cylinder 1 to see if it was the plugs it started to miss on 1 and 4. Then randomly cylinder 2 started to have a misfire which I hadn't touched.
So, will replacing only 1 plug on a cylinder cause more issues?
Not sure why 3 cylinders are now misfiring, MEOy buddy thinks I need to touch the terminals to reset the computer.
Had a misfire cylinder 1, I swapped over the plugs and wires to cylinder 4 to see if it followed to rule them out, I did put 1 new plug in because AutoZone didn't have the ones I wanted in stock so I had to order them. But one of the ones i had pulled out looked like the previous owner had stripped it and I didn't want to risk putting in back in and not being able to get it out,
It ran worse than it did before, But the misfire moved to Cylinder 4. Moving the wires back to cylinder 1 to see if it was the plugs it started to miss on 1 and 4. Then randomly cylinder 2 started to have a misfire which I hadn't touched.
So, will replacing only 1 plug on a cylinder cause more issues?
Not sure why 3 cylinders are now misfiring, MEOy buddy thinks I need to touch the terminals to reset the computer.
Mine did that. Had 5 of 6 misfires. I changed out the MAF SENSOR and addeded a can of Techron injector cleaner. That got me running right for now. Hope your Rig is that easy as well
