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Throttle body relearn

Tiny
DAYLIGHT
  • MEMBER
  • 2005 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 162,367 MILES
My vehicle was running sluggish, when in park it would idle high then low like it was going to cut off. It ran okay but did not have much power. I checked the plugs and they were fouled, so I replaced them and cleaned the throttle body. After reconnecting the battery, I started it up and it was okay for about a minute, then the check engine started to flash then it stayed on. Tried to drive it and it drove worst than it was before.
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Saturday, December 2nd, 2017 AT 5:39 PM

14 Replies

Tiny
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  • MECHANIC
  • 31,937 POSTS
What is the code set? I will need this to see what is going on.
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Sunday, December 3rd, 2017 AT 3:41 AM
Tiny
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There is no code. I use CarMd tester and no reading. I use same device on my other car and got a reading.
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Sunday, December 3rd, 2017 AT 7:35 AM
Tiny
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I am second guessing myself, but if had just changed the plugs I would not have the problem I am now facing.
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Sunday, December 3rd, 2017 AT 7:57 AM
Tiny
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With light on there will be a code, you may need a different reader to try and retrieve codes. Please give it a try again and get back here for further assistance.
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Sunday, December 3rd, 2017 AT 3:39 PM
Tiny
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  • MEMBER
  • 8 POSTS
Had a bad fuse. Replace and scanner has a code po300.
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Monday, December 4th, 2017 AT 8:10 AM
Tiny
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This is a random misfire code, I would re check the that the spark plugs are correct and if they are not iridium plugs that the gaps are correct, if changing the plugs is all that you have done, this is a good place to start and also check fuel pressure and if you can, a live data read to check O2 sensors are working correctly, start here.
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Monday, December 4th, 2017 AT 1:57 PM
Tiny
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  • MEMBER
  • 8 POSTS
Okay, I had number 5 and number 6 power pack in the wrong spots, put them were they were suppose to be, truck ran a lot better, but check light is still on. Was able to take truck to inspection lane and it passed. Check light is still on. AUTO ZONE error codes PO300, P0014.
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Monday, December 4th, 2017 AT 8:20 PM
Tiny
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The random misfire code is still there and the other is a exhaust cam position code

Possible causes Dirty Oil Low engine oil level Faulty Exhaust Camshaft Position Actuator Solenoid Exhaust Camshaft Position Actuator Solenoid harness is open or shorted Exhaust Camshaft Position Actuator Solenoid circuit poor electrical connection Faulty Engine Control Module (ECM)

check all tune items for random misfire code, also check for vacuum leaks, start here
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Tuesday, December 5th, 2017 AT 3:57 AM
Tiny
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  • 8 POSTS
All these issues has everything to do with relearning the throttle body?
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Tuesday, December 5th, 2017 AT 4:51 AM
Tiny
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No, but you need to sort out the check light, the throttle body should just be a drive cycle.
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Tuesday, December 5th, 2017 AT 1:17 PM
Tiny
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Will do, and thanks for your information. Get back with you soon
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Tuesday, December 5th, 2017 AT 3:30 PM
Tiny
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Ok, I hope you find the problem re post if you require more assistance, that’s what we are here for!
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Tuesday, December 5th, 2017 AT 5:17 PM
Tiny
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Changed oil and put in a new filter and light went off. Thanks for your help.
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Sunday, January 7th, 2018 AT 9:39 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Tuesday, January 9th, 2018 AT 6:10 PM

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