Loss of power when accelerating

Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hi DREMXNROE,

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Have a wonderful rest of your day!

Renee
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Friday, September 7th, 2018 AT 5:48 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2003 CHEVROLET TRAILBLAZER
  • 210,000 MILES
The problem is total advance only works the instant driver come off of throttle, traveling at 3000rpm the advance is reading is 12 degrees at 60% throttle position. The second one takes their foot off of the gas it will spike up to 30 plus degrees for a split second. Very sluggish on take off, no power on take off, idle is perfect at 8 to 12 degrees. The advanced timing makes changes but not at proper times. What sensor controls the computer to know where the issue is or is there another problem to solve?
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Friday, September 7th, 2018 AT 5:48 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Readings sound right to me. I would be looking at other areas.

Start with fuel pressure test.

Check back pressure reading on cat converters.

Start with basics before off away from basic engine

Roy
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Friday, September 7th, 2018 AT 5:48 PM (Merged)
Tiny
COOTER57
  • MEMBER
  • 1 POST
  • 2003 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 178,000 MILES
Vehicle goes into reduced engine power. Get code for accelerator position sensor and throttle position sensor.
Replaced accelerator position sensor, problem happens less often but not solved.
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Friday, September 7th, 2018 AT 5:49 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It still cold be throttle position sensor or a worn out throttle body you might try cleaning throttle plate on both sides and iac hole and then erasing codes and see if it comes back.
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Friday, September 7th, 2018 AT 5:49 PM (Merged)

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