05 TB 4.3V6 stalls at redlight - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 02-16-2018, 01:50 PM
sayedawg sayedawg is offline
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05 TB 4.3V6 stalls at redlight

My son Blazer stalled on him at red light twice , said he put it back in park and started it back up and drove on like normal. Said the motor wasn't running rough and fires right back up. Has 118,000 and probably could use a tune-up and fuel injection/throttle body cleaning maybe ? I am going to check the air filter may sure it isn't clogged up. Any suggestions would be great
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Old 02-16-2018, 02:05 PM
rtliquid rtliquid is offline
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My '04 occasionally does (did) the same thing. I haven't figured out the root cause, but I know how to make it NOT happen. As long as the AC and/or defroster isn't running, it never stalls. I don't know what your setup is, but I have auto climate control, and AC is ON by default unless you push the snowflake-looking button and the display shows AC Off. It's a bit of a nuisance, but I'd rather do that than deal with the stalling.
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Old 02-16-2018, 03:01 PM
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EnvoyBoy2004 EnvoyBoy2004 is online now
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First thing to do is clean throttle body, there are threads about how to do on this site and there are videos on YouTube. Make sure to either pull the PCM fuses (10 & 28 in underhood fuse box) or disconnect battery. This will force a relearn.

If this does not help, check for vacuum leaks around intake manifold and check fuel pressure at fuel rail.
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  #4  
Old 02-17-2018, 05:11 AM
princej99 princej99 is offline
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Quote:
Originally Posted by rtliquid View Post
My '04 occasionally does (did) the same thing. I haven't figured out the root cause, but I know how to make it NOT happen. As long as the AC and/or defroster isn't running, it never stalls. I don't know what your setup is, but I have auto climate control, and AC is ON by default unless you push the snowflake-looking button and the display shows AC Off. It's a bit of a nuisance, but I'd rather do that than deal with the stalling.
is your battery and alternator in good shape? what your describing sound like an elec overload problem. main under volt.
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Old 02-17-2018, 04:41 PM
Envoy193 Envoy193 is offline
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Engine Stalls During Idle

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Originally Posted by rtliquid View Post
My '04 occasionally does (did) the same thing. I haven't figured out the root cause, but I know how to make it NOT happen. As long as the AC and/or defroster isn't running, it never stalls. I don't know what your setup is, but I have auto climate control, and AC is ON by default unless you push the snowflake-looking button and the display shows AC Off. It's a bit of a nuisance, but I'd rather do that than deal with the stalling.
When the throttle body is dirty, the vehicle's air/fuel mixture will be thrown out of balance and the engine will stall. Spraying some throttle body cleaner on the battlefly 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 and might need to reset the throttle body.
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Old 02-17-2018, 06:42 PM
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Envoy193 - the throttle body has no adjustments, the PCM controls the idle. The accepted practice when cleaning the throttle body (and this means taking it off the intake and cleaning front and back sides), is to disconnect the battery or pull the PCM fuses so the PCM will reset to factory default settings.
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Old 02-18-2018, 12:18 AM
Envoy193 Envoy193 is offline
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Executing the 'Idle Re-learn Procedure' the right way.

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Originally Posted by EnvoyBoy2004 View Post
Envoy193 - the throttle body has no adjustments, the PCM controls the idle. The accepted practice when cleaning the throttle body (and this means taking it off the intake and cleaning front and back sides), is to disconnect the battery or pull the PCM fuses so the PCM will reset to factory default settings.
Thank you for your feedback. Unfortunately, if you want to get technical, I would only agree with you half way. The proper way to do the job is with a professional level scanner tool, so that the 'Idle Re-learn Procedure' can be performed on the vehicle. That's the right way to go about doing the repair.
Pulling the fuses is a shortcut that could cause other problems. And, since he is asking for help in this forum I do not expect him to have such tool in order to correct the condition.
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