Can any solve this mystery?!
March 8th, 2018, 3:13 AM
#1
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Can any solve this mystery?!
Tahoe 5.3 L v8
milage 258k
Mystery started with tire monitor system light on due to one sensor was broken.
Followed with:
Traction control service warning
Stabilitrak service warning
Then cruiser going on off all the time, eventually completely off
Engine light, shaking/ hesitating while idle+ and loss of power while moving at any speed
Cylinders 1+ 4 misfire
rough start (sounded chunky)
Cleaned Throttle Body, connectors, air filter; No changes.
Checked plugs & found damage and oily.
I fed up with this malfunction, the more try to search, the more very different thoughts received (computer, O2 sensor, tps, speed sensor, plugs, coils, exhaust sensor ...etc)
I decided not to spend any, unless i ensure root cause.
any thoughts?
milage 258k
Mystery started with tire monitor system light on due to one sensor was broken.
Followed with:
Traction control service warning
Stabilitrak service warning
Then cruiser going on off all the time, eventually completely off
Engine light, shaking/ hesitating while idle+ and loss of power while moving at any speed
Cylinders 1+ 4 misfire
rough start (sounded chunky)
Cleaned Throttle Body, connectors, air filter; No changes.
Checked plugs & found damage and oily.
I fed up with this malfunction, the more try to search, the more very different thoughts received (computer, O2 sensor, tps, speed sensor, plugs, coils, exhaust sensor ...etc)
I decided not to spend any, unless i ensure root cause.
any thoughts?
Last edited by Butbut; March 8th, 2018 at 3:22 AM.
March 8th, 2018, 8:28 AM
#2
what model year? if its 2007 to 2014 range with afm...cylinders 1 & 4 are afm cylinders.
misfires will causes the traction, stability, engine shake you describe.
Is the engine burning oil?
misfires will causes the traction, stability, engine shake you describe.
Is the engine burning oil?
March 8th, 2018, 10:14 PM
#3
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It’s 2008
ya i start to see very light smoke out of exhaust; but not sure if it’s oil or maybe not.
However oil leak is mostly happening as i see external parts covered with oil
BTW, cruiser is dead, it doesn’t light up when pressed.
ya i start to see very light smoke out of exhaust; but not sure if it’s oil or maybe not.
However oil leak is mostly happening as i see external parts covered with oil
BTW, cruiser is dead, it doesn’t light up when pressed.
Last edited by Butbut; March 8th, 2018 at 10:17 PM.
March 9th, 2018, 7:21 AM
#4
Administrator
Cruise control shouldn't enable if check engine light is on, also if the brake pedal switch is not working correctly it will keep the cruise disabled.
As for the AFM, check your plugs for oil fouling and consider doing a compression check, if compression is pretty consistent, replace the fouled plugs, consider replacing the PCV valve cover or installing a catch can.
Watch your oil level, remember a full oil change is 6 qts.
As for the AFM, check your plugs for oil fouling and consider doing a compression check, if compression is pretty consistent, replace the fouled plugs, consider replacing the PCV valve cover or installing a catch can.
Watch your oil level, remember a full oil change is 6 qts.
March 9th, 2018, 10:48 PM
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good advice.
if you get zero compression...the afm lifters have collapsed.
if its oil consumption; follow this
https://static.nhtsa.gov/odi/tsbs/20...62524-7690.pdf
if you get zero compression...the afm lifters have collapsed.
if its oil consumption; follow this
https://static.nhtsa.gov/odi/tsbs/20...62524-7690.pdf
I will apply the compression test. TPS already done, no changes.
AFM suspected+ crankshaft
thank you