Engine Missing or Cruise Control Issue?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Marc Marc

Member
Joined
Sep 2, 2010
Posts
82
Reaction score
44
My 2013 Yukon Denali Hybrid (187k miles) feels like the engine is stuttering or missing when on the freeway going downhill on cruise control. Figured it was the engine trying to slow down the momentum going downhill, though it never used to be this rough when newer.

Today the check engine light was blinking as this was occurring, but went out once I released the cruise control.

Suggestions? Thanks.
 

dnt1010

Full Access Member
Joined
Dec 2, 2018
Posts
416
Reaction score
258
Location
Tennessee
I am going to guess cylinder #1 plug has lost part of its ceramic tip and is partially fouled. (Just a WAG LOL) Lets get that #1 plug pulled out and get a close up pic of it posted on here right away!
 

wjburken

Supporting Member
Joined
Dec 26, 2017
Posts
9,705
Reaction score
26,283
Location
Eastern Iowa
After you pull #1, might as well pull the others. Also, get a scanner on it and see if you have any stored codes that might point you in a good direction.
 

GreyStone

Full Access Member
Joined
Feb 18, 2020
Posts
896
Reaction score
991
could one of the Hybrid batteries be shot - another person on here mentioned they had to replace the traction battery on their Hybrid.
 
OP
OP
M

Marc Marc

Member
Joined
Sep 2, 2010
Posts
82
Reaction score
44
Thanks for the suggestions. I am on a trip and won't return home to my tools for a couple of weeks. I will pull the plugs and probably change them when I return. Will let you know if that helps once I get the chance to get it done. Drove it the last two days with no issue or engine light coming on, but have been on level freeways.
 
OP
OP
M

Marc Marc

Member
Joined
Sep 2, 2010
Posts
82
Reaction score
44
Replaced all plugs and wires. Engine is smoother and gas mileage is restored, but I still notice what feels like the cruise control is fighting (vehicle stuttering) when coasting downhill on the freeway. Otherwise all is well; no codes.
 

OR VietVet

Multnomah Falls
Supporting Member
Military
Joined
Oct 8, 2014
Posts
19,067
Reaction score
31,163
Location
Willamette Valley
Do you have a tow/haul mode on the transmission? If so, does it do it in both modes of tow/haul mode or without it on?
 
OP
OP
M

Marc Marc

Member
Joined
Sep 2, 2010
Posts
82
Reaction score
44
Unlike my previous non-hybrid Yukon Denalis, there is no tow/haul mode on this model.
 

Forum statistics

Threads
128,783
Posts
1,805,338
Members
91,761
Latest member
AlbertoTahoe2011
Top