Jump to content

Different cranking sound for GMT 800 small block v8 engines.

tonyghkbve

Recommended Posts

tonyghkbve Enthusiast

tonyghkbve

Posted
Posted

i've noticed, but don't know why, the 99-03 Vortec 4.8/5.3 on all GMT 800 trucks sound different than the 04-07. The 99-03 will make a 1-1/2 cranks then runs, the 04-07 will make 4-5 cranks then start. I don't what contributes to this sound. I'm guessing its different timing, modified PCM, etc. despite same style engine.

Chris Senior Enthusiast

Chris

Posted
Posted

99-02 was cable throttle body, 03-07 had drive by wire. That may be the difference

 

Sent from my DROID RAZR using Xparent Red Tapatalk 2

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

At some point they added a feature, I don't know what to call it but you only need to put the key to start for a moment and release and the truck will continue to crank afterward until it starts. My 2003 didn't do that, the 2011 does.

tanked_darren Senior Enthusiast

tanked_darren

Posted
Posted
At some point they added a feature, I don't know what to call it but you only need to put the key to start for a moment and release and the truck will continue to crank afterward until it starts. My 2003 didn't do that, the 2011 does.

Early as 2006 in a 1 ton at least also, you cannot crank the engine while it is running, I'm not kidding try it 2006+

 

I'm not at work the trucks may be a 2007 classic actually.

 

Sent from my Nokia 5190 using Tapatalk 2

 

Chris Senior Enthusiast

Chris

Posted
Posted

I cant crank while running, but I know I have to hold the key while it cranks

Badass69 Senior Enthusiast

Badass69

Posted
Posted

I cant crank while running, but I know I have to hold the key while it cranks

 

 

The GMT900's have the tip start feature..... and I don't know what year it started in them. My 09 had it but I never paid attention on the 07 and 08's I drove. I had an 06 for 3 years and I remember having to hold the key to start it. Only drove one 07 classic with an L33 and I really don't remember what it did. The lockout thing on the starter has been around for quite a while.

 

None of my GMT800's crank excessively on startup. My 05 is always cold started in the winter and its 2 cranks at most and running, and my 04 is the same way. If it's taking longer I would start looking at things like fuel pressure as a problem.

tonyghkbve Enthusiast

tonyghkbve

Posted
  • Author
Posted

Well, doesn't seems to answer my question correctly. The thing is the 99-03 trucks equipped with Vortec 4.8 and 5.3 sound different versus and 04-07 with the same Vortec 4.8 and 5.3 engine. Listen carefully, they sound different while cranking.

 

2002 GMC sierra with 5.3

 

http://www.youtube.com/watch?v=4OWr1EBM63U

 

2006 Silverado with 4.8

 

Chris Senior Enthusiast

Chris

Posted
Posted

Just sounds like 1 extra crank

 

Sent from my DROID RAZR using Xparent Red Tapatalk 2

zach1990 Senior Enthusiast

zach1990

Posted
Posted
i've noticed, but don't know why, the 99-03 Vortec 4.8/5.3 on all GMT 800 trucks sound different than the 04-07. The 99-03 will make a 1-1/2 cranks then runs, the 04-07 will make 4-5 cranks then start. I don't what contributes to this sound. I'm guessing its different timing, modified PCM, etc. despite same style engine.

 

My 2000 is more on the 5 cranks side of this

 

Sent from my SGH-I927 using Tapatalk 2

 

 

nickvrebel Senior Enthusiast

nickvrebel

Posted
Posted
At some point they added a feature, I don't know what to call it but you only need to put the key to start for a moment and release and the truck will continue to crank afterward until it starts. My 2003 didn't do that, the 2011 does.
my 2003 did have the feature. Rarely noticed it, but I noticed it a handful of times.

 

 

Sent from my iPhone using Tapatalk

Archived

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

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,760
    Total Members
    8,960
    Most Online
    MASONV88888888
    Newest Member
    MASONV88888888
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,481 Guests (See full list)

  • Latest Articles

  • Posts

    • MASONV88888888
      Another 6.2L engine failure!

      By MASONV88888888 · Posted

      My 2025 Silverado 1500 had to receive a brand-new engine (long block) under warranty last month at only around 16,500 miles. Before the replacement, the truck repeatedly displayed "Engine Oil Level Low" warnings, even though the Oil Life Monitor still showed around 50% remaining after about 6,000 miles since my last oil change. After seeing the warning several times, I checked the dipstick with the engine cold, and the oil level was completely normal. The next day, the message escalated to "Add Engine Oil." At first, I assumed it was just a faulty oil level sensor, so I brought the truck to the dealership. After inspecting the engine, they found internal cylinder wall scoring and ultimately replaced the entire long block under warranty. Before this happened, I was planning to install a 4-inch lift and suspension upgrade on my truck. After needing a new engine at just 16,500 miles, I honestly don't see the point anymore. I also contacted GM to ask whether my vehicle qualified for a buyback, but I was informed that it does not at this time. Anyway, this experience has left me with serious concerns about the long-term reliability of this engine. I sincerely hope NHTSA expands the current investigation or recall to include 2025 model and performs a thorough inspection of affected vehicles. My biggest concern is that these engines may fail shortly after the powertrain warranty expires. If GM truly stands behind this engine, then at the very least, please consider extending the powertrain warranty to 10 years for affected owners. That would go a long way toward restoring customer confidence.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      Without exception but then I'm the odd duck, right? I know what goes into that test, how it is calculated and thus how to beat it. But EPA values are often not beaten by the general public and the government has in past years adjusted the means and methods to come to those values to more closely approximate "Joe Average".    The only real trick to beating that EPA average is don't drive like "Joe Average".    It's the same method you used to profit from "Economic Migration" and in doing so beat the 'stats'. But you, like me, are not "Joe Average".     The thing you don't seem to grasp is this "Purchasing Power Index" isn't forward looking. It doesn't predict what it going to be but looks backward and states what it was. They are not telling us what the THINK, they are telling us what they MEASURED. Example:    Wife says "I'm going to lose 40 pounds by Christmas". May she does, maybe she doesn't but the doctors office who weighed her when she made that statement and again at Christmas only REPORTS what the RESULT was. You and I can banter about what was possible and what aunt Tilly did till the cows come home but the result is the result. Arguing otherwise is.....irrational. That's all I'm saying. This isn't about:      What you are calling a 'Statistic' is a RESULT not a CALCUATION and as a result the RULE. Like gravity as a rule, it can not be broken. 
    • MASONV88888888
      Rattle in the rear!

      By MASONV88888888 · Posted

      Just wanted to say thank you for posting this. Years later, your thread is still helping Silverado owners.   I bought my 2025 Silverado 1500 in January 2025, and I've had what feels like the exact same rattle since day one. After reading your findings, I believe my truck has the same issue with the cable carrier contacting the rear sliding window. To be honest, I had pretty much given up on pursuing the issue. It wasn't until I recently drove another brand's pickup that I realized just how quiet their cabin was—and how noisy mine has been all along. On my truck, the rattle happens on almost any paved road, gets even worse on rougher pavement, and I can even hear it during braking and acceleration.   I actually referenced your thread when submitting my case to GM, hoping they'll recognize this as a recurring issue instead of treating it as an isolated incident. The reason I reached out to GM first is because my dealership told me they would need to keep the truck for at least two days just to diagnose the problem. I was concerned that even after two days, they still might not be able to identify the source of the rattle before giving the truck back to me. I had also asked a few dealerships about this issue during previous service visits, but none of them seemed to know what was causing it or had a solution. That's why I decided to contact GM directly first, hoping they might already have an official repair procedure or guidance for this issue.   I also hope GM eventually comes up with an official fix for this problem. I have a feeling there are many Silverado owners experiencing the same rattle, but most either choose to live with it or simply don't know what the cause is.   Really appreciate you taking the time to document your diagnosis. Your post is still making a difference years later.
    • Buckwild27
      Gas Prices

      By Buckwild27 · Posted

      I have 2 choices. 
    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      Do you have access to BP fuels? Some stations have Silver 91 E-0 priced the same as their 93 E-10.  There is a local Marathon with 90 alky free for $6 a gallon but I go down the road to BP for $5-ish. They also have a 100 E-0 but that stuff is $10 a pop. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...