Jump to content

Rough Idle 08 Silverado

dirtracer455

Recommended Posts

dirtracer455 Enthusiast

dirtracer455

Posted
Posted

Hey everyone,

 

So I just started my truck up tonight and found that it had a MUCH rougher idle than normal. You could feel it through the steering wheel, as well as the pedals.

I let the engine warm up for about a minute and no change. I pulled out of the driveway and after pulling forward about 100ft the rough idle stopped. Drove the truck for awhile tonight and noticed nothing else.

 

Just bought this truck a couple months ago and have never had this problem before.

 

Hope everything is alright please advise!

 

My truck is a 2008 LTSilverado 4x4 [About 2000 miles]

DamageInc Enthusiast

DamageInc

Posted
Posted
Hey everyone,

 

So I just started my truck up tonight and found that it had a MUCH rougher idle than normal. You could feel it through the steering wheel, as well as the pedals.

I let the engine warm up for about a minute and no change. I pulled out of the driveway and after pulling forward about 100ft the rough idle stopped. Drove the truck for awhile tonight and noticed nothing else.

 

Just bought this truck a couple months ago and have never had this problem before.

 

Hope everything is alright please advise!

 

My truck is a 2008 LTSilverado 4x4 [About 2000 miles]

 

Sorry that I can't be of any help, but something tells me that it will be related to the AFM. Keep us posted....

98 Z71 SLT Senior Enthusiast

98 Z71 SLT

Posted
Posted

100% Agreed with above post.

 

GM Engineering is having numerous problems with Active Fuel special lifters actually "coming-apart" in the engine block, creating a mess, and causing misfires on actual AFM related cylinders.

 

You want GM Document 08-06-01-018A in your hands when returning to the dealership.

 

Get in touch with MS3DALE or MCueva...they can print the document to fit this screen.

pm26 Senior Enthusiast

pm26

Posted
Posted
100% Agreed with above post.

 

GM Engineering is having numerous problems with Active Fuel special lifters actually "coming-apart" in the engine block, creating a mess, and causing misfires on actual AFM related cylinders.

 

You want GM Document 08-06-01-018A in your hands when returning to the dealership.

 

Get in touch with MS3DALE or MCueva...they can print the document to fit this screen.

 

 

This does not surprise me. I have been criticized and ridiculed for expressing negative opinions about the AFM, but looks like I was right about potential long term issues with this system. I almost bought a new 07 left over Impala SS, except it has that darn AFM which I cannot stand.

tobias Senior Enthusiast

tobias

Posted
Posted
100% Agreed with above post.

 

GM Engineering is having numerous problems with Active Fuel special lifters actually "coming-apart" in the engine block, creating a mess, and causing misfires on actual AFM related cylinders.

 

You want GM Document 08-06-01-018A in your hands when returning to the dealership.

 

Get in touch with MS3DALE or MCueva...they can print the document to fit this screen.

 

 

This does not surprise me. I have been criticized and ridiculed for expressing negative opinions about the AFM, but looks like I was right about potential long term issues with this system. I almost bought a new 07 left over Impala SS, except it has that darn AFM which I cannot stand.

 

 

:dunno: It'll be okay. :cheers:

minibike132 Senior Enthusiast

minibike132

Posted
Posted
100% Agreed with above post.

 

GM Engineering is having numerous problems with Active Fuel special lifters actually "coming-apart" in the engine block, creating a mess, and causing misfires on actual AFM related cylinders.

 

You want GM Document 08-06-01-018A in your hands when returning to the dealership.

 

Get in touch with MS3DALE or MCueva...they can print the document to fit this screen.

 

Where did you get the "coming apart" I think the engineering quote would be "collapsed afm lifter". I have had a few collapsed and it makes a very noticeable collapsed lifter noise not just a missfire. As far as a collapsed lifter causing long term engine issues the jury is out. The worst IMO that could happen is a flat cam lobe but I wouldn't be too worried about it unless it went on for a long time. I had a used Trailblazer with afm and a collapsed lifter come in from auction. The old lady liked the vehicle and I was pretty confident that there was no long term dammage that after I fixed it we bought it.

 

OP:I agree that it may be related to afm but I doubt it is a lifter, they don't usually fix themselves.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • chris21
      Brand new to this forum. Questions about re-gearing my 26’ HD

      By chris21 · Posted

      37's would probably fit with a 3" lift. GM only has two gear ratios for these trucks 3.73 for gas and 3.42 for diesel. And they can't be programmed for anything else at the moment. The rough country module just corrects the speedometer and odometer to adjust for tire size it's not a programming device.   You haven't said if your truck is gas or diesel, but for a gas truck the 10L1000 with 3.73 gears has a lower final drive ratio than the 6L90 it replaced would if it were swapped to 4.10s. GM used the same 3.73 gearing in 6 speed gas trucks. I don't think you'll have any issue running 37's with the 10 speed other than the reduction in mpg and towing/weight capacity which is as much of a function of the lift as the tire size.
    • GN2018
      Range AFM/DFM Disabler Flaw

      By GN2018 · Posted

      Actually, it probably was the brakes.  It's weird the way the messages came across, but I took it to the dealer thinking that something was wrong with the sensor and in fact, the rear brakes were shot.  What I don't understand is why the messages never said, your brake pads are low.  First I got the message I posted above, taking about new pads being detected.  Then I got a message saying that the system needed repaired.  It never said, change your brake pads.
    • No1UKnow
      Transmission Woes :-(

      By No1UKnow · Posted

    • ryan35205
      Lets Talk Z60 Suspension

      By ryan35205 · Posted

      Did the KYBs keep it the same height in the front? I was concerned that pre-assembled assembly would raise it up an inch to standard non-z60 height.. I guess which it would make the rake 1 inch instead of 2 inches.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Thank you for keeping the train on the tracks and for a thoughtful engagement. I enjoyed the reflection on a previous stance to refine and improve your position. I like that inquisitive flexibility about you Atlas.    No the process isn't sterile. Hundreds, perhaps thousands of miles of piping, vessels, pumps. Chevron, the people I worked for, were keenly aware that there is a market for what is known as their "ISOCLEAN" line of lubricants. These are lubricants that are the same as those sold bulk that are further processed by filtration to a level your particular application demands. They will filter and package and provide lab documentation as required. Do not kid yourself. Every gallon of oil that goes into a Chevron Turbine, reciprocating compressor, generator is prefiltered and tested before being charged. Lest wise it was when I was there in the plants I worked in.    There are requirements set by manufactures for the cleanliness of the oils used in their equipment. OTR such as CUMMINS has standards shared with customers on this. Commercial interest selling to Ma and Pa do, but don't share that information. Not even upon request but internally, they do exist.    The GM study sited, (Graph from Machinery Lubrication in previous post) only shows "relative" importance.  I find that fascinating. By constructing the graph like this they admit there are dozens of factors in engine life and via scientific method determined the effect of 'relative cleanliness' on engine life not in miles but in 'FACTORS'. This allows a certain amount of reverse engineering does it not?   They even provided some touchstones. Beta 75 as a reference point. Wonderful stuff!!   Smaller blenders CAN and some DO take the time and effort to do better than a refinery or large bulk blender, like Warren Oil, in improving the "in the can" cleanliness. No I don't have a list but testing could generate that information.    Again, but one of several levers we can pull to improve engine life. The simplest is keeping a clean work station while doing your own oil changes.     

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...