Hummer h3 misfire

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Aug 28, 2024 | 07:14 PM

#31

hummerz

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Joined: Jul 2012

Posts: 9,018

From: C-Town

Quote:

Originally Posted by beltz0826@gmail.com

Installed new sensor. Ran great until hooked coolant temp sensor up then 2 codes. Misfire on cylinder 5 and coolant temp sensor detected. The coolant sensor isn’t a doorman it is NTK

What are the codes?

Aug 28, 2024 | 07:19 PM

#32

beltz0826@gmail.com

Thread Starter

Member

Joined: Aug 2024

Posts: 42

From: Ga

Just the one code when I put the scanner back on it. P0305.. if I unplug the coolant sensor that code goes away and I only have p0018

Aug 28, 2024 | 07:42 PM

#33

beltz0826@gmail.com

Thread Starter

Member

Joined: Aug 2024

Posts: 42

From: Ga

P0118.. not the one above. Sorry about that. Fat fingers lol

Aug 28, 2024 | 07:43 PM

#34

hummerz

Senior Member

Joined: Jul 2012

Posts: 9,018

From: C-Town

Quote:

Originally Posted by beltz0826@gmail.com

Just the one code when I put the scanner back on it. P0305.. if I unplug the coolant sensor that code goes away and I only have p0018

Simple fix>>>>Excessive Carbon on Top of Valves or Sticking Valves!

Aug 28, 2024 | 07:48 PM

#35

beltz0826@gmail.com

Thread Starter

Member

Joined: Aug 2024

Posts: 42

From: Ga

Regular seafoam? What is that thing hanging from the hood? Hook it into fuel line?

Aug 28, 2024 | 08:04 PM

#36

hummerz

Senior Member

Joined: Jul 2012

Posts: 9,018

From: C-Town

Quote:

Originally Posted by beltz0826@gmail.com

Regular seafoam? What is that thing hanging from the hood? Hook it into fuel line?

Fuel Induction Applicator

Remove/plug vacuum line and connect with a vacuum hose in place. Control valve to a slow drip and increase idle 1000rpm over idle.

Last edited by hummerz; Aug 28, 2024 at 08:10 PM.

Aug 28, 2024 | 08:23 PM

#37

Justinh

Senior Member

Joined: Feb 2014

Posts: 477

From: north Alabama

Hummerz, what is a good way to increase and hold the idle? The peddle is so freaking sensitive and slow to react I find it hard to even hold any certain high idle.

Aug 28, 2024 | 08:49 PM

#38

hummerz

Senior Member

Joined: Jul 2012

Posts: 9,018

From: C-Town

Quote:

Originally Posted by Justinh

Hummerz, what is a good way to increase and hold the idle? The peddle is so freaking sensitive and slow to react I find it hard to even hold any certain high idle.

I use a squeegee between the pedal and seat, then adjust the seat forward/backward to the desired idle. Idle will fluctuate when injecting, yet make sure not too much.