Choppy idle

[Untyped]

Rover Oxygen Sensor - Bosch LR035750

Rover Oxygen Sensor - Bosch LR035750

www.fcpeuro.com

Can also just punch the LR part number into Google.

Oh this one... yeah I am not sure but it states 2013+

I didn't see anyone suggest checking the spark plugs yet. If you haven't taken a look at those, it would be a good diagnostic step. I had a slight rough idle once warm for a few months. No codes were being thrown. My initial thought was clogged injectors, but when I went to replace an injector I noticed the spark plugs were toast. The gap was twice what it should have been. The picture shows the worn out plug on the left. It was pretty obvious that it was the plugs at that point and i'm surprised that it even ran as well as it did since all eight of the plugs were worn the same. No more miss with replacement.
View attachment 25445

that was my first thought but it turns out they were not the issue. Will be removing them to inspect soon just as a precaution.

 

[Nechaken]

I didn't see anyone suggest checking the spark plugs yet. If you haven't taken a look at those, it would be a good diagnostic step. I had a slight rough idle once warm for a few months. No codes were being thrown. My initial thought was clogged injectors, but when I went to replace an injector I noticed the spark plugs were toast. The gap was twice what it should have been. The picture shows the worn out plug on the left. It was pretty obvious that it was the plugs at that point and i'm surprised that it even ran as well as it did since all eight of the plugs were worn the same. No more miss with replacement.
View attachment 25445

Curious what mileage that is at ?

 

[itsaguything]

That older plug doesn’t look like oem. Plugs are supposed to be changed every 100,000 km/60,000 miles…

 

[AGLR4]

Curious what mileage that is at ?

That was the plug wear after 60K miles

 

[AGLR4]

That older plug doesn’t look like oem. Plugs are supposed to be changed every 100,000 km/60,000 miles…

The worn ones on the left were OEM NGK LR032080 installed at 123K miles. The picture shows the wear when I changed them at 183k. That's why I didn't suspect them as the cause of the misfire earlier since they should not have been so worn after only 60k miles.

 

[itsaguything]

Oh, now I understand.
You’re right, I wouldn’t expect that either.
The obvious;
Were the gaps checked at installation?
Have you had continuous misfires?
Using the spec’d fuel?
Losing coolant too?

 

[Nechaken]

That was the plug wear after 60K miles

Damn, I should probably check my plugs then.