Possible Vacuum Leak, With Graphs

[ivin74]

When you say clean do you mean running a fuel injector cleaner through the gas tank? Or physically taking the fuel injectors out to observe them? It's been a while since I've ran injector cleaner through them IIRC. So I'll give that a shot.

No, remove the injectors and clean them your self.

Would this mean an issue with the spark? IE it's not getting enough spark to burn the fuel correctly? The only confusing thing to me is that it's also happening on cylinders 1, 2 and 8. So cylinders 1, 2, 3 and 8 are the primary culprits. Especially number 3. I changed the wire from cylinder 4 and 3 and that didn't make a difference.

If the computer is detects more fuel than normal and it trys to adjust by adding more spark. This is telling me you definitely have an injector problem.

Also, the air to fuel ratio on start up is below 14.7 so that means it's not getting enough air, correct? So, why does the PCM want to keep dumping fuel into the combustion chamber?

This happens because the injector or injectors have leaked fuel into the cylinder, and the computer was not aware of the additional fuel.

 

[2001LSHoe]

No, remove the injectors and clean them your self.

If the computer is detects more fuel than normal and it trys to adjust by adding more spark. This is telling me you definitely have an injector problem.

This happens because the injector or injectors have leaked fuel into the cylinder, and the computer was not aware of the additional fuel.

This is perfect thank you! I will be doing this.

What’s the best way to get a pigtail harness for the injector? Other than taking one from a junkyard. Is there a part number?

 

[ivin74]

This is perfect thank you! I will be doing this.

What’s the best way to get a pigtail harness for the injector? Other than taking one from a junkyard. Is there a part number?

Here you go.

Disconnect one injector and verify the Amazon pigtail matches the one on your suv.


HiSport LS Truck Fuel Injector Connector Pigtail Wire Compatible with Mini Delphi Multec 2 (8 pack) OEM Tooling, Connector, Lock, Seals, & Terminals WPINJ31X8 https://a.co/d/akHu7QD

 

[2001LSHoe]

Alright I did all of that. I actually ended up having them professionally cleaned and that didn’t make a lick of difference.

I’ll be taking it to a shop next Wednesday and hopefully they can figure it out. I’ll update when I know more.