2010 6.2 stumbles at idle.

[jdm_sixtwo]

Ever since I bought my 2010 6.2, it would idle a little off. It would idle fine and then drop to 400ish rpm and then hop to 700rpm and then level back off at 600, and idle fine for a minute or two and then do it again. Is there any common fix for that symptom? I think plugs were done on the truck somewhere before I bought it. Truck is tuned with 5 star now and still does it. The truck does have a sticky VCT actuator that i just still haven’t replaced, and sometimes it freaks out and the truck almost lopes at idle, but it hasn’t done that in a few months.

 

[CleverGirl_]

Ever since I bought my 2010 6.2, it would idle a little off. It would idle fine and then drop to 400ish rpm and then hop to 700rpm and then level back off at 600, and idle fine for a minute or two and then do it again. Is there any common fix for that symptom? I think plugs were done on the truck somewhere before I bought it. Truck is tuned with 5 star now and still does it. The truck does have a sticky VCT actuator that i just still haven’t replaced, and sometimes it freaks out and the truck almost lopes at idle, but it hasn’t done that in a few months.

Mine does something like that, OEM plugs, i call it normal.

 

[jdm_sixtwo]

Gotcha. With no other raptor owners that I know close to me I don’t really know if a lot of the quirks in my truck are normal. I can compare everything but engine stuff to my buddies 5.0 but I don’t know anyone with a 6.2.

 

[Ricoman]

Ever since I bought my 2010 6.2, it would idle a little off. It would idle fine and then drop to 400ish rpm and then hop to 700rpm and then level back off at 600, and idle fine for a minute or two and then do it again. Is there any common fix for that symptom? I think plugs were done on the truck somewhere before I bought it. Truck is tuned with 5 star now and still does it. The truck does have a sticky VCT actuator that i just still haven’t replaced, and sometimes it freaks out and the truck almost lopes at idle, but it hasn’t done that in a few months.

NOT an expert,but mine was running rough couple years ago....
Repair bill reads:
Check vehicle for rough idle
Perform computer test P0203
Replaced wire connector at #3 injector
Cleaned MAF Sensor and reset ECM

Might want to check all your injector wires...my #3 was chewed my a mouse....who meet his demise a few days later.

 

[stevenstommyboy1]

MAF sensor clean for sure. So I have had 2 6.2s and both exhibited the same issue. Plugs and new coils cured both. Didn’t bother to narrow down the issue. And I wasn’t guilty of killing a poor hungry cold mouse.

 

[Gryphon313]

Have you checked for vacuum leaks? The canister purge valve is the first place I’d look.

 

[jdm_sixtwo]

Oh I know the canister purge valve is bad, I have the hard start issue after fillup. Didn’t realize it could cause the idle issue.

 

[Gryphon313]

Yep. Replace it with Motorcraft only and not from Amazon. Small job with big results, if that’s your issue.

 

[mprice1234]

Gotcha. With no other raptor owners that I know close to me I don’t really know if a lot of the quirks in my truck are normal. I can compare everything but engine stuff to my buddies 5.0 but I don’t know anyone with a 6.2.

My 2010 6.2 idles very smooth, always have so I don't think your issue in normal in any way. Definitely would follow some of the advice posted here for you.

 

[jdm_sixtwo]

Mine normally idles smooth, not as smooth as my buddies platinum 2012 5.0, but it’s not shaky. The issue I’m having is it surging at idle.