2003 Envoy Codes - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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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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  #11  
Old 02-05-2019, 08:00 AM
45Frank 45Frank is offline
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2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
Join Date: Sep 2018
Location: WNC
Posts: 63
OK I'm about to seriously take this thing out and us it for target practice. It does have a little better pick up still but is back to idling like garbage to the point it sometimes feels like it wants to stall when ya take off.
Everytime I do anything it idles better for a short time then goes back to idling like garbage. I have a pending code of multi cyl misfire now.
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  #12  
Old 02-05-2019, 11:12 AM
wcosh's Avatar
wcosh wcosh is offline
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2003 Chevy TrailBlazer LT EXT
Dark Green Metallic 4.2L I6 4X4
Join Date: Aug 2009
Location: Vancouver BC
Posts: 325
I assume P0300 is the code ?

Try testing each cylinder's coil by taking off the airbox then disconnect one cylinder's coil wire one at a time. If the idle degrades after disconnected then that cylinder is firing OK. If there is NO change after disconnection then you could assume that cylinder is the problem. The possible culprit could be the coil

worth a shot
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  #13  
Old 02-15-2019, 05:07 PM
Hypnagojia Hypnagojia is offline
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2005 GMC Envoy SLT
Summit White 4.2L I6 AWD
Join Date: Jan 2019
Location: Wisconsin
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I would say replace number 3 ignition coil, same symptoms I've had, I've replaced two coils now and I'm sure the other 4 will be acting up soon.
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  #14  
Old 02-23-2019, 06:27 PM
45Frank 45Frank is offline
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2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
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Location: WNC
Posts: 63
Quote:
Originally Posted by Hypnagojia View Post
I would say replace number 3 ignition coil, same symptoms I've had, I've replaced two coils now and I'm sure the other 4 will be acting up soon.
I ended up disconnecting one coil at a time. Some made a much bigger difference then others, the number 3 made nearly no difference so I replaced it. No more codes but still runs bad, rough idle and nearly stalls when I take off 1 out of every dozen or so times.
How much difference should it make when disconnecting the coils?
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  #15  
Old 02-23-2019, 07:32 PM
Hypnagojia Hypnagojia is offline
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2005 GMC Envoy SLT
Summit White 4.2L I6 AWD
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Location: Wisconsin
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My 05 Envoy has been in same boat as yours. Rough idle, poor acceleration. It even died while I was in the gas station once. Both times I replaced my coils I had a blinking CEL and the code told me which one was misfiring. I replaced all plugs, cleaned throttle body and it was like night and day. Ran great after that. May be dumb question but when you replaced your plugs did you double check the gap? I think some claim to be pre gapped but I check them anyway. Troubling that you said the back two plugs were able to be pulled out with only an extension, no ratchet. Shouldn't have been that loose.
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  #16  
Old 02-24-2019, 10:03 AM
45Frank 45Frank is offline
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2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
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Quote:
Originally Posted by Hypnagojia View Post
My 05 Envoy has been in same boat as yours. Rough idle, poor acceleration. It even died while I was in the gas station once. Both times I replaced my coils I had a blinking CEL and the code told me which one was misfiring. I replaced all plugs, cleaned throttle body and it was like night and day. Ran great after that. May be dumb question but when you replaced your plugs did you double check the gap? I think some claim to be pre gapped but I check them anyway. Troubling that you said the back two plugs were able to be pulled out with only an extension, no ratchet. Shouldn't have been that loose.
I cleaned the TB it was a mess as u can see by the pictures. Didn't gap the plugs but did replace them. Everytime I do something it runs fine for a day or a week maybe then back to running like crap.
When ya replaced the coil did it make a big difference and did ya check the others? As I said I disconnected one at a time and some made a big difference some not so much. Wondering if that is normal?
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  #17  
Old 02-24-2019, 02:21 PM
Hypnagojia Hypnagojia is offline
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2005 GMC Envoy SLT
Summit White 4.2L I6 AWD
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Give this a read if you like... https://m.autoserviceprofessional.co...fire-diagnosis Both times my engine has acted like yours, the coil did the trick. That's not to say something else isn't going on with yours, but it sounds very similar to situation mine was having. If it's not throwing a code for cylinder misfire then I think it would be difficult to narrow down. If #3 was throwing code and you swap #3 to #5, then #5 misfires you know it's the coil. Yes it made a "big difference" with mine because I knew it was a coil. Maybe cleaning the TB wasn't enough, the actuator could be messed up I wouldn't know how to test for that.
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  #18  
Old 02-24-2019, 06:33 PM
45Frank 45Frank is offline
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2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
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Location: WNC
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Quote:
Originally Posted by Hypnagojia View Post
Give this a read if you like... https://m.autoserviceprofessional.co...fire-diagnosis Both times my engine has acted like yours, the coil did the trick. That's not to say something else isn't going on with yours, but it sounds very similar to situation mine was having. If it's not throwing a code for cylinder misfire then I think it would be difficult to narrow down. If #3 was throwing code and you swap #3 to #5, then #5 misfires you know it's the coil. Yes it made a "big difference" with mine because I knew it was a coil. Maybe cleaning the TB wasn't enough, the actuator could be messed up I wouldn't know how to test for that.
No, no codes at all right now but it is running sluggish as h*ll right now and gas mileage is in the pits, just about 13mpg when I usually do about 15.5. On top of that the fan clutch has been erratic since replacing. It seem to come on whenever I stop at a light or slow down now.
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  #19  
Old 02-24-2019, 08:10 PM
Hypnagojia Hypnagojia is offline
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2005 GMC Envoy SLT
Summit White 4.2L I6 AWD
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Location: Wisconsin
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I also just had my fan clutch replaced, it was causing a Reduced Engine Power light to come on and kept the vehicle under 20 mph. New clutch is quite loud first 30 seconds of driving then calms down, I've read something about getting the PCM flashed after replacing the fan clutch but not sure about it yet.
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  #20  
Old 02-26-2019, 07:56 AM
45Frank 45Frank is offline
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2003 GMC Envoy SLT XL
Carbon Metallic 4.2L I6 4X4
Join Date: Sep 2018
Location: WNC
Posts: 63
Quote:
Originally Posted by Hypnagojia View Post
I also just had my fan clutch replaced, it was causing a Reduced Engine Power light to come on and kept the vehicle under 20 mph. New clutch is quite loud first 30 seconds of driving then calms down, I've read something about getting the PCM flashed after replacing the fan clutch but not sure about it yet.
Used it yesterday to visit kids in SC and it was like I was dragging a house behind me. The fan seems to disengage after 2-3 minutes but my gas mileage is down to about 11-12 mpg. No codes and still idles rough. Fan does now come on every time I stop or slow to a crawl.
Looks like its time to visit a dealer which I'm sure will cost as much as it's worth.
Even my gotoguy screwed me the last time with my Explorer after 10 yrs of use.
I've put over a thousand into this thing in the last week and still need a front end alignment and two new tires.
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