During hard acceleration, black smoke comes from tailpipes. no check engine lite. 2011 Buick Enclave

The engine for the AWD, is the same engine as the FWD.

All these things are vacuum actuated and must have vacuum thru the lines to make the blend doors/flaps work properly to make the air go where you wish it to go. Check that all vacuum lines are connected to these actuators properly and that they are getting vacuum to them from the control panel. Vacuum to control panel must come from the engine to a reservoir, a black plastic ball on the passenger side at firewall under hood and from reservoir thru firewall to control panel. Check that you have vacuum at all connections.

Make sure it's fully in Park.

Buick Enclave No Start Problems - Car Forums at Edmunds.com

forums.edmunds.com > Buick > Buick Enclave

Mar 1, 2009 - 31 posts - ‎13 authors
Learn more about Buick Enclave at the Edmunds.com Car Forums! Read real ... Time to take it in and see why car will not start with the remote key. Anyone else .... I drove my brand new 2011 Enclave yesterday. It sat for an ... Buick Enclave engine won't shut off. Parking brake light ...
5 posts
Aug 9, 2014
Buick La Crosse Stalling/Starting Problems
31 posts
Jul 26, 2006
More results from forums.edmunds.com

EnclaveForum.net: Won't start from time to time

www.enclaveforum.net > ... > Recalls, TSBs, FAQs, Links & How To's

Jun 23, 2008 - 20 posts - ‎16 authors
I have been having an issue of my Enclave not starting from time to time. If I turn the ignition back off and try again, sometimes it will start after the first ... 2011 Audi Q7; 2009 Audi A8L ... I usually just "flick" the key to let it auto-start and it normally works fine but ..... BUICK ENCLAVE Technical Service Bulletin EnclaveForum.net: 2013 BUICK ENCLAVE ...
20 posts
Aug 14, 2014
EnclaveForum.net: Car continues to run after key removed
20 posts
Nov 13, 2012
EnclaveForum.net: evaporation hose on gas tank - does ...
17 posts
Jun 25, 2012
EnclaveForum.net: Engine won't start low fuel level
12 posts
Feb 3, 2012
More results from www.enclaveforum.net

assuning there is nothing major wrong, get some forte injector and use it as recommended. I once had a renault laguna diesel fail an MOT test, a roadworthiness test that is, on emissions...it was absolutely chucking out black smoke but the engine ran well. I put 2 bottles of injector cleaner in the half full tank and went out for an eighty mile drive revving the engine in the lower gears. I returned to the testing station an hour and a half later and the engine was running perfectly.
Alternatively, assuming the engine runs well but is just a little smokey, have it terracleaned, this will remove most of the carbon deposits from the engine/exhaust and should increase the life of your engine simultaneously improving fuel economy

On this website (link below) you finde fuse box diagram and description for Buick Enclave 2011

BUICK Enclave 2011 2012 fuse box diagram Auto Genius

my 2012 Buick enclave sputtered at 30 mpg and again at 60 mpg why is that

On this website (link below) you find fuse box diagram and description for Buick Enclave 2011

BUICK Enclave 2011 2012 fuse box diagram Auto Genius

What year, make and model car is this? Most likely, black smoke is
usually a carburator problem. If it's fuel injected, black smoke can be caused by 1) leaking or faulty fuel injecters, 2) faulty choke, 3)dirty air
filter or 4) faulty distributor cap and/or rotor. Hope this helps.

Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor. Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil.