Intermittent idle problem

[Fleetgeo]

my 2001 Yukon Denali 6.0 is having a intermittent issue

I was driving one day and out of no where the check engine ligh started flashing and I came to a stop it started to shake real bad as if it wanted to shut off the voltage gauge kept fluttering to lower volts , once income to a complete stop it's shake then turn off it'll turn back on with no problem and idle fine for about 30 seconds then I'll drive and it'll start again it will hesitate and feel likes its sputtering it does this for 1 week then 1 week it drives fine with no problems


I changed the fuel pump and filter , plugs and wires , sea foam the tank , I replaced all vacuum hoses , water pump , starter , thermostat

 

[retiredsparky]

Have you had it checked for codes?

 

[Danny3737]

When was the last time you cleaned the throttle body? Could have an injector or 2 going bad

 

[Fleetgeo]

When was the last time you cleaned the throttle body? Could have an injector or 2 going bad

Cleaned the throttle body about 1 week prior to that intermittent probelm happening I hooked up my snap on Solus scanner newest one on the market

No codes came up expect for a lean/ rich code and P0300 and P0154 and P0141

 

[95escahoe]

Did u check your intake gaskets? Mine had the same idle issue and the P0300 minus the other codes


Sent from my iPhone using Tapatalk

 

[retiredsparky]

p0300 random misfire
p0154 o2 sensor insufficient activity
p0141 o2 sensor heater malfunction

The codes tell me that you may have an intake manifold gasket problem or a fuel problem from injectors being clogged. Too much air creates an improper fuel/air mixture (too lean). The o2 sensor may see this and the ECM tries to rectify the problem, but cannot put enough fuel into the cylinder to make up for all the air that is leaking past the gasket. The ECM then concludes that there is something wrong with the o2 sensor, when really it is the high quality GM intake gasket failing prematurely or an injector that needs cleaning. Thank you federal government for forcing poor quality gas on us with that crappy ethynol in it.

P0300 can also mean that an ignition pack or spark plug is failing, despite being relatively new. New does not mean better-I have had new aftermarket plugs that are supposedly better fail to run the motor and cause codes to be set. Who knows why. I do believe that the OEM engineering in many cases (not all for sure) is well equipped to design an engine that will function for a long time without having problems. I have seen many aftermarket so called better parts that are no good because the budget for engineering, r&d testing, road testing, computer monitoring of flame patterns, power output, etc is just not there. Think about it, if I sell 1000 spark plugs a week, do I have the same resources to test every part that goes into a vehicle? No. But if I am making $10K from every SUV/pickup that comes off the line, there is a certain % of that profit that does not go to shareholders. It goes into trying to make the vehicle be just reliable enough that my customers will come back when too much goes haywire and buy a new one.

Somewhere on this website or youtube there is a video on increasing the tube size from a can of carb cleaner to the size of an injector intake tube so that the injector can be alligator clipped to a battery and fired repeatedly while sending shots of cleaner through the injector. He uses heat shrink tubing (that is made lined with glue) (used for outside wire splices) to increase the size of the tube. A hot air gun shrinks the tube and melts the glue. Then hose clamp the tubing onto the injector o-ring intake port. Injectors often fail when they fail to atomize or mist the fuel enough so that it ignites.
Carefully stepping off the pedestal into the cow pasture:
Larry

 

[Fleetgeo]

p0300 random misfire
p0154 o2 sensor insufficient activity
p0141 o2 sensor heater malfunction

The codes tell me that you may have an intake manifold gasket problem or a fuel problem from injectors being clogged. Too much air creates an improper fuel/air mixture (too lean). The o2 sensor may see this and the ECM tries to rectify the problem, but cannot put enough fuel into the cylinder to make up for all the air that is leaking past the gasket. The ECM then concludes that there is something wrong with the o2 sensor, when really it is the high quality GM intake gasket failing prematurely or an injector that needs cleaning. Thank you federal government for forcing poor quality gas on us with that crappy ethynol in it.

P0300 can also mean that an ignition pack or spark plug is failing, despite being relatively new. New does not mean better-I have had new aftermarket plugs that are supposedly better fail to run the motor and cause codes to be set. Who knows why. I do believe that the OEM engineering in many cases (not all for sure) is well equipped to design an engine that will function for a long time without having problems. I have seen many aftermarket so called better parts that are no good because the budget for engineering, r&d testing, road testing, computer monitoring of flame patterns, power output, etc is just not there. Think about it, if I sell 1000 spark plugs a week, do I have the same resources to test every part that goes into a vehicle? No. But if I am making $10K from every SUV/pickup that comes off the line, there is a certain % of that profit that does not go to shareholders. It goes into trying to make the vehicle be just reliable enough that my customers will come back when too much goes haywire and buy a new one.

Somewhere on this website or youtube there is a video on increasing the tube size from a can of carb cleaner to the size of an injector intake tube so that the injector can be alligator clipped to a battery and fired repeatedly while sending shots of cleaner through the injector. He uses heat shrink tubing (that is made lined with glue) (used for outside wire splices) to increase the size of the tube. A hot air gun shrinks the tube and melts the glue. Then hose clamp the tubing onto the injector o-ring intake port. Injectors often fail when they fail to atomize or mist the fuel enough so that it ignites.
Carefully stepping off the pedestal into the cow pasture:
Larry

Hey thanks for the help ima try spraying carb cleaner and see if it's the gaskets I have replaced entire fuel system except injectors I have been putting on bP gas (89) and add sea foam every 3 weeks it's been 2 weeks so far haven't ran into any problems yet though I think it's the alternator I've notice one time last week I was driving and it felt as though the truck turned off then back on in a split second i didn't notice it shut off until I saw the battery light come on . When I first bought the truck the guy gave it a jump and I noticed the alternator has been squeaking from the pulley so I'm not sure what I should do

 

[retiredsparky]

Squeaks no good. Replace the alternator before that belt locks up and tears up a bunch of expensive stuff like hoses, radiator, fan, tranny cooling hoses, etc. It gets real expensive fast. Replace the belt tensioner too. I speak from experience (700$)!

 

[Fleetgeo]

Squeaks no good. Replace the alternator before that belt locks up and tears up a bunch of expensive stuff like hoses, radiator, fan, tranny cooling hoses, etc. It gets real expensive fast. Replace the belt tensioner too. I speak from experience (700$)!

Thanks will replace with new ac Delco alternator I have a 2001 6.0 Denali which amp alternator you prefer I get it a link to a good alternator

 

[1992rs]

Thanks will replace with new ac Delco alternator I have a 2001 6.0 Denali which amp alternator you prefer I get it a link to a good alternator

I recently got a 130 amp reman from o'reileys. I called around to the major auto parts store and my dad called his dealership he works at and that was the biggest that came up. I found a couple 145 amp ones on rock auto but I needed it that day. It looks nice and does its job, but I'm always leery on big chain auto parts store stuff. They have a great warranty, but I'd rather not have to do the job twice. I try to buy AC delco when I can personally.


Sent from my iPhone using Tapatalk