Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Search Auto Parts

2005 Tahoe misfiring on 1 3 5 & 7 cylinders


  Email This Post



tahoe1115
New User

Jan 28, 2012, 9:28 PM

Post #1 of 6 (22467 views)
2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

2005 Chevy Tahoe 5.3L with 150,000 miles
I'm having issues with cylinders 1,3,5 and 7 misfiring and running lean. Cylinder 1 and 3 are misfiring the worst according to my diagnostic machine. I've changed the intake gaskets, O2 sensor. I've changed all the plugs, new wires and the fuel injectors are working fine and not clogged. I took off the valve cover on that side and it's very clean inside with not one bit of sludge. I'm thinking possibly I might have a valve sticking or a blown head gasket with it blowing in between the 1st and 3rd cylinders because after taking off the oil filler cap I'm getting suction through the whole and it shouldn't be there. Does anyone have a suggestion or possibly have dealt with this problem before?


Thanks Ron


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 28, 2012, 10:11 PM

Post #2 of 6 (22426 views)
Re: 2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

How did you go about verifying that " the fuel injectors are working fine and not clogged"?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tahoe1115
New User

Jan 28, 2012, 10:25 PM

Post #3 of 6 (22419 views)
Re: 2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

I swapped the injectors from the bad side to the side with 2, 4, 6 and 8 cylinders and put the ones from the side that's fine on the side with 1, 3, 5 and 7 cylinders. The side with 1.3,5 and 7 still ran bad and the other side was still good so it showed me the injectors aren't the issue. Trust me I'm scratching my head on this one


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 29, 2012, 6:26 AM

Post #4 of 6 (22384 views)
Re: 2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

This may be worth looking into





Bulletin No.: 06-06-04-046
Date: September 12, 2006
INFORMATION Subject:
Information on Engine Misfire MIL/SES Light Illuminated or Flashing DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0420 or P0430 Models:
1999-2007 Cadillac, Chevrolet, GMC Full-Size Pickup and/or Utility Trucks
with 4.8L, 5.3L, 5.7L, 6.0L or 6.2L VORTEC GEN III, GEN IV, V-8 Engine (VINs V, C, T, Z, B, 3, M, 0, J, R, U, N, Y, K, 8 - RPOs LR4, LY2, LM7, L59, L33, LC9, LH6, LMG, LY5, L31, LQ4, LQ9, L76, LY6, L92)
with Active Fuel Management(TM) and E85 Flex Fuel
If you encounter vehicles that exhibit the above conditions, refer to SI for the appropriate DTC(s) set. If no trouble is found, the cause may be due to an ECM ground terminal that has corroded with rust over time. Inspect the main engine wiring harness ground terminal (G103) for this condition.


The wire terminal (G103) attaches either to the front or to the rear of the right side cylinder head, depending on the model year of the Full Size Pickup and/or Utility Trucks. If the ECM ground terminal has been found to be corroded, then follow the service procedure outlined in this bulletin to correct the corrosion issue.


Remove either the nut or bolt securing the main engine wiring harness ground terminal (G103) to the right cylinder head. Refer to the above illustration to determine where the ground is located on the vehicle (1).
Remove all rust from the ground terminal, the cylinder head and the retaining nut or bolt.
Position the main engine wiring harness ground terminal and install the nut or bolt.
Tighten:
Tighten the retaining nut or bolt to 16 N.m (12 lb ft).
Apply some type of electrical moisture sealant to protect the harness terminal from further corrosion.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tahoe1115
New User

Jan 29, 2012, 7:46 AM

Post #5 of 6 (22375 views)
Re: 2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

I will check into that ground wire.........Thanks
Do you think if this is this ground is an issue, it would only affect one side of the engine? The left bank with cylinders 2,4,6 and 8 is running perfectly.


(This post was edited by tahoe1115 on Jan 29, 2012, 7:52 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 29, 2012, 8:04 AM

Post #6 of 6 (22370 views)
Re: 2005 Tahoe misfiring on 1 3 5 & 7 cylinders Sign In

It's at least worth looking into. The only other things I can think of would be either vacuum leaks on that bank, EGR issues or a restricted Cat on that side only



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap