Mechanics

CHEVROLET TRAILBLAZER ENGINE PROBLEM

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?
AD
Avatar
Guest
March 22, 2013.




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

ASEMaster6371
Mar 22, 2013.


AD