2005 Trailblazer LT 4.2 L stalling and starts back up - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 06-21-2018, 08:59 PM
lephthand69 lephthand69 is offline
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2006 Chevy TrailBlazer LT
white 4.2L I6 2WD
Join Date: Jan 2017
Location: Zephyrhills, Fl.
Posts: 3
Unhappy 2005 Trailblazer LT 4.2 L stalling and starts back up

no codes and runs smoothly and at proper idle. Has great acceleration and cruises well also. Just seems to stall for no reason, confused. Any Ideas?
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  #2  
Old 06-21-2018, 09:37 PM
Envoy193 Envoy193 is offline
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2002 GMC Envoy SLT
Black 4.2L I6 AWD
Join Date: Aug 2016
Location: New York, NY
Posts: 41
Engine Stalls During Idle

Possible cause - Carburetor

If your vehicle has a carburetor, is is likely that you have a stuck choke or something is obstructing your fuel flow. If the carburetor's choke (located in the upper carburetor) sticks in the open position, the vehicle's air/fuel mixture will be thrown out of balance and the engine will stall. Spraying some choke cleaner on the linkage may solve the problem, if only temporarily. If you are able to prevent stalling by lightly depressing the gas pedal when the idle becomes too rough, the problem is simply that your idle speed is probably set too low.
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  #3  
Old 06-21-2018, 11:44 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
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Envoy193 - apparently you know nothing about this platform. The GMT360 engines do not use carburetors, as well as most vehicles produced in the last 15 - 20 years. Varieties of fuel injection, both manual and electronically controlled is used throughout. Please give relevant advice or none at all.
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  #4  
Old 06-22-2018, 06:58 AM
princej99 princej99 is offline
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2008 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
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Location: ont
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Quote:
Originally Posted by lephthand69 View Post
no codes and runs smoothly and at proper idle. Has great acceleration and cruises well also. Just seems to stall for no reason, confused. Any Ideas?
last tuneup was done when?

any check engine lights on?

mileage?

Envoy193, No carbs on any of the 2002-2009 GM full size SUV's.
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  #5  
Old 06-28-2018, 02:29 PM
jhickman87 jhickman87 is offline
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2003 GMC Envoy SLE XL
Indigo Blue Metallic 4.2L I6 4X4
Join Date: Apr 2017
Location: WV
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IIRC, my 03 Envoy (approx. 156k miles) behaved similarly a few weeks before one of the ignition coils failed. Keep an eye out for Cylinder Misfire codes, which may or may not trigger the SES light right away (depending on severity/frequency). I'd also suggest checking the spark plugs for fouling, and that they're the correct type and gap according to the owner's manual, which I believe calls for iridium plugs. It may be worthwhile to visually and audibly check for leaks in your vacuum lines, and give your throttle body a nice cleaning.
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  #6  
Old 07-02-2018, 08:24 PM
Teraldo79 Teraldo79 is offline
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2004 Chevy TrailBlazer LS EXT
Summit White 4.2L I6 4X4
Join Date: Nov 2013
Location: Olympia Wa
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any other symptoms?

Does it matter what accessories are running? i.e. the heater, defrosters, fog lights, radiator fans?

Could be low voltage from the alternator and low battery as well. my 04 TB EXT sometimes stalls at stop lights when the A/c is on full blast. but i have noticed that only after a long time of not driving at highway speeds, when it doesnt get a nice long charge on the battery
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