Last post on Jan 15, 2013 at 7:16 PM
You are in the Chevrolet TrailBlazer
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Chevrolet TrailBlazer, Chevrolet TrailBlazer EXT, SUV
#2 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [satvic]
Oct 29, 2007 (9:50 am)
I own a 2007 Trailblazer...I6 4.2L, much like yours. I have had a similar problem happen twice in my brand new truck. The first time I was driving about 20mph- the truck lost power and dropped to almost 5-10 mph. With in seconds..it had kicked back in and it was fine. I have Onstar so I called them and had them do an emergency diagnostic- found nothing wrong. Exactly 30 days later- truck did it again, this time I was doing about 75 down the highway and it lost power and dropped to about 25-30 mph. Very scary on a busy highway!!! I took it to the dealer, they say nothing is wrong. I even contacted GM regarding this matter, they gave me free oil changes for a year becuase they dont know what is wrong. My father came up with this idea that maybe Onstar had something to do with it. We deactivated Onstar (its been over a month since Onstar has been gone now) and i havent had the problem at all. Just was wondering your thoughts on this, it seems like we are having the same problem. No one from the dealership or GM can figure it out, so its almost like I am conducting my own investigation!!!!!
#3 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [vbell]
Nov 01, 2007 (9:18 am)
unbelievable, isn't it Well, I haven't gotten around to checking my OBDII connections so I can't scan for anything I now mostly drive on cruise control cause it only happens when I'm pushing the pedal by foot (even though I check everything I can't see what's causing it) .... in mine, the injection controlled by a switch (when I push the accelerator down) the cable that goes to the throttle opener goes through a switch .. thinking to replace that and to see what happens.
Now I started getting engine light during rainy weather .. i think one of the oxygen sensors .. but no idea which one. after i drive for an hour smth must be drying up cause the light goes away
#4 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [vbell]
Nov 14, 2007 (7:18 am)
this sounds like new feature that allows Onstar to cut your power if police request that action. Could it be that someone at OnStar is tweaking the system and testing randomly?
#5 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [ficuss]
Nov 22, 2007 (2:56 pm)
except I don't have Onstar ......
#6 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [satvic]
Nov 24, 2007 (9:45 am)
satvic: I was responding to a prior post by vbell with an 07 Trailblazer. OnStars new feature allows THEM to reduce your engine power when THEY want to. So if the driver of a car equiped with this feature decides to punch the accelorator to merge with traffic and OnStar decides to reduce the power at the same time, you won't merge very nicely. Now some will say that OnStar won't activate this feature unless asked to do so by the police, but that doesn't rule out accidental or unplanned activation. IMHO they have inserted yet another weak link in an already weak dependability chain.
Nov 25, 2007 (9:26 pm)
I understood So, in this case my question is: is there smth in the system that can fail and cause the loss of power EVEN IN CASE where the Onstar was never installed on this particular car to begin with? Shouldn't there be some kind of plug to complete the circuit bypassing OnStar device features? any idea what it'd look like if it exists?
#8 of 74 Re: so... [satvic]
Nov 26, 2007 (2:05 pm)
there are numerous conditions which would cause the engine to run at reduced power, all of which are by design. I would recommend taking a very close look at all of your gauges when this happens and report every item to the mechanic. How fast were you going, which gear was the car in, were you towing something, etc. Get a printout from the mechanic of all the possible reasons for programmed, reduced engine power. Then think of what may apply to your particular situation.
One more thing, do a search of "reduced engine power" in the Ranier, Trailblazer, Envoy forum and see if anything sounds similar.
#9 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [satvic]
Nov 27, 2007 (10:29 am)
I've experienced the same with my 02 TB. The intermitten power loss , sometimes causing the engin to stall, was due to a O2 sensor. I've had it replaced three times, the last being about a year and a half now. The sensor was so corroded and in bad condition (supposedly due to water leaking onto it??) it was very difficult to replace.
I've had no major problems since, other than the fact the SES light stays on all the time. Even after being reset. I seriously put black tape over it.
I have 120K miles on it now.
#10 of 74 Re: 04 Chevy Trailblazer - Loss of power & Stalling [bigbassguy1]
Nov 27, 2007 (11:11 am)
i gotta try this cause every time I drive in rainy weather my engine light comes on. as soon as it dries up, light goes away. I wonder if it that's the same O2 sensor .. do you know how many are there? where is the one you've been replacing is located at? thanx so much
#11 of 74 living with an 02 TB
Dec 03, 2007 (5:58 pm)
sounds like the same exact thing I went through
seriously, every time it rained, or I washed my car (underneath and under each wheel well) it seemed to trigger the SES light. I am not sure which sensor they replaced, but know that the engine hesitation and stalling went away. The truck runs great now (outside the sway bar links needing to be replaced again) but the SES light is still on. At this point, it really does not bother me anymore.
What do you want for $30,000, right