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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 06-02-2019, 12:23 AM
MarkSewell1973's Avatar
MarkSewell1973 MarkSewell1973 is offline
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2004 GMC Envoy SLE
Silver Mist Metallic 4.2L I6 2WD
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Location: Henagar,AL
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Engine skipping

My 2004 envoy has started skipping bad and when I had it scanned it didn't show any cylinder misfires! It had been while sitting at a red light or stop sign you could hear it miss ever once in a while but it got low on fuel other day and I stopped and put gas in and when I left the gas station it started missing real bad so I stopped and bought a bottle of Heet water remover and added. That didn't help so I add a bottle of Lucas fuel injection treatment and still no change. Had it scanned and it don't show any misfire on any cylinder! Could it be a clogged injector?
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  #2  
Old 06-02-2019, 10:31 AM
NJTB04 NJTB04 is offline
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2004 Chevy TrailBlazer LS
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If I'm understanding your post correctly, you have an engine miss, i.e. spark plugs or coils.
Sometimes the check engine light takes a while to set, but you should be able to read it with a scan tool.
Assuming no mechanical malfunction, maybe a coil or a plug.
If you can get your hands on a Tech2, you can do an injector balance test with it.
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Old 06-02-2019, 01:20 PM
falcon8667 falcon8667 is offline
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2005 GMC TrailBlazer LS
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I had in 2005 GMC Envoy intermittent misfire. Turns out to be failing coil pack. Find some uphill stretch of road and step on it hard. Most likely you going to have engine service blinking and if you continue to drive Will settle the error code. If you're lucky it will show you which cylinder misfires.

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  #4  
Old 06-03-2019, 10:04 AM
mddombrowski mddombrowski is offline
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2006 Chevy TrailBlazer LT EXT
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You remember how you woke up one morning and you didn't feel great, then about a day and a half later you actually came down with a cold? Same thing here: your engine may not be misfiring enough yet to set the CEL.

It could be anything, although coils tend to break down under load rather than at idle.

Best to get your hands on a professional level scan tool. You'll want to look at MODE 6 data to look at the misfire counter, and short- and long-term fuel trims. Idling misfire makes me lean towards an unmetered vacuum leak. Without this you're going to be pointing the parts shotgun and hoping for the best.

As an alternative you can pay a professional shop to do the diag for you, even if you want to do the repair yourself.
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Old 06-04-2019, 11:43 AM
falcon8667 falcon8667 is offline
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2005 GMC TrailBlazer LS
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I don't want to sound like a fool however if I remember correctly when I was checking intermittent misfire with my scanning tool I had noticed this. In order for the CEL to set on you must have about 32000 misfires. Anything below of that number on a scan tool will not show as a CEL. During my normal driving the number was about 24- 25,000 so there was no engine light on only under heavy load like driving uphill and accelerating hard number of misfires reached above 32000 and error code was recorded.

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Old 06-04-2019, 03:23 PM
mddombrowski mddombrowski is offline
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2006 Chevy TrailBlazer LT EXT
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Something like that. It looks at the crankshaft position speed as an indicator and when the misfire is significant enough to impact emissions controls the PCM commands the MIL on.
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