Last post on Dec 05, 2013 at 8:40 PM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, GMC Sierra 2500, Chevrolet Silverado 3500, GMC Sierra 3500, Truck
#329 of 403 rough/ won't idle
May 25, 2010 (6:04 pm)
My 1994 GMC Sierra 1500 4x4 has all of a sudden decided to not idle without dying. My son was pulling out from a driveway and it started to idle and try to die. He has changed fuel filter twice in 3 days, plugs, wires, fuel pump, O2 sensor. Nothing has seemed to help. It will almost always die when idling, no matter how long the engine has been running, and sometimes dies when slowing down to turn a corner. Any more ideas except a mechanic. Thanks in advance.
#330 of 403 Re: rough/ won't idle [dtsd]
May 25, 2010 (9:56 pm)
Idle air controller.
#331 of 403 Re: rough/ won't idle [dtsd]
May 26, 2010 (12:00 am)
does it die at random? then start back up? I have a 99' chevy k1500 and that's what it did. ran fine but died at any given time at any temp., I spent $400 on various parts. plugs, wires, coil, dist. cap, rotor, O2 sensor, map sensor, crank sensor, fuel pump relay, fuel filter. then one day it hiccupped real hard a few times. so i changed the fuel pressure regulator and so far so good, seemed to have solved the problem. does your idle fluctuate up and down? if so i would say throttle position sensor. if not, MAF sensor maybe. a vacuum leak some where could cause similar symptoms. good luck, sorry for rambling
May 26, 2010 (12:08 am)
the engine temperature sensor! It will fail, so it will tell the throttle positioning sensor that the motor was cold so it kept dumping allot of fuel. So when the gas was pushed it flooded it and it would die! Problem solved!!
Let us know if this helps you, These autos are having this problem !
#333 of 403 Silverado stalling
May 30, 2010 (4:40 am)
I have a 2000 Silverado 4.3 v6 I had problems last year with intermittent stalling then, it completely died. The mech replaced the fuel pump....ran fine for 10 months now it went back to intermittent stalling then it died again, mech replaced crankshaft timing sensor, rotor cap and the actual rotor i think.
It died two miles from garage on the way home...back to mech he said it was a loose battery cable not giving enough spark to plugs.
It ran great for 2 days ...now back to intermittent stalling.
it does it while idling or running at highway speeds it seems like it stumbles a little.
Any help please?
Jun 04, 2010 (8:07 am)
I cleaned out the throttle body which helped a little.
The next day it wouldnt start...I found that the rotor was somewhat corroded so i cleaned it.
It fired up but we noticed that the spark from the coil seemed weak, so I replaced that.
This morning it idled fine so On the road it missed a little until it died completely.
Now I have no spark whatsoever from the coil and the ignition module tests fine.
#335 of 403 engine stumble with p0300
Jun 06, 2010 (12:27 pm)
Hi I have researched the forum and worked on this problem but there seems to be so many possibilities I'm hoping someone can narrow it down. My GMC seirra (2001) with a 4.3 V6 has developed the following problem over the last week. At first there was a very slight surging when driving at steady state throttle. This has now become a massive surging that resembles applying and removing half throttle at 2 second intervals while the throttle is actually held steady at half throttle. The interval between the engine running fine and having no power at all is very repetitive and continues no matter what speed. I have removed and cleaned the cap and rotor, checked plug wires and the TPS. I have changed the fuel filter. The p0300 code is set when driving under hard acceleration and massive surging. It seems to me that the ignition is turning on and off. When" on" all cylinders are firing, when "off" no cylinders are firing. Any suggestions would be very appreciated.
#336 of 403 Re: engine stumble with p0300 [tom467]
Jun 06, 2010 (1:13 pm)
my 99' k1500 with a 5.7 died at random, i replaced just about every sensor under the hood. cap and rotor, plugs and wires, coil, ignition module, map sensor, crank sensor, still nothing. one day it started doing what you are describing, i replaced the fuel pressure regulator and it hasn't done it since. I dont know if that is your problem but it would be worth checking in to.
#337 of 403 What now? Problems with replacement engine in 2008 Silverado
Jun 14, 2010 (9:27 am)
Here's the deal, a couple weeks ago my 2008 Silverado with 60,000 miles decided to blow - or more appropriately, decided to drop a valve 4 hours from home. It lost all power, started throwing messages, started ticking (obviously the piston slapping the valve) and started smoking white smoke.
So under warranty, they towed my vehicle and replaced the engine. I got the special treatment of getting a 99 Lumina to drive! I picked it up several days later (on a Friday) with a new engine and headed home. All was fine for about 30 miles. Then the emissions light came on. I pulled into a parts store and had them scan my codes - P0171 and P0174 - right and left banks lean. I had them reset the codes, thinking it was a glitch with the new engine...30 or so miles later, got the code again.
I called the dealer Monday and explained the issue, to which they told me, "that's an emissions issue, unrelated to the engine and not under warranty"!!!!!!!!!
So I reset it again...and again it came on. Then I drove it about 100 miles and it went off...then another 30 or so and it came back on....
Since clearly I wasn't going to get any satisfaction from the dealer (4 hours away), I decided to call Warranty customer service...explained the issue, started getting the "it's an emissions problem not covered". I asked to speak to a supervisor that couldn't be found, was told one would call me back...waited for 4 hours...and had the original person call me back.....
"Sir, I spoke to the dealership service department and they said it wasn't related to the engine" UGGGGGGGGGGGHHHHHHHHHHHHHHH
Long story short...Ms Customer service explained over and over and over that an O2 sensor is "different" from the engine...she couldn't understand how a trashed valve, or heavy smoke, could have damaged/fouled an O2 sensor!!!!!!
So..once I get this fixed on my dime, I'm trading the POS in...I guess there's a reason FORD is the #1 selling truck...I just wish I had listened to the ads...and wish my tax dollars hadn't been part of GM's bailout since it's going to be short lived!
Sorry for my rant...I've loved this truck...but the "Customer Service" blows!
#338 of 403 Re: What now? Problems with replacement engine in 2008 Silverado [08gmblewup]
Jun 15, 2010 (8:26 am)
There are horror stories like yours with every major auto manufacturer. I've had problems with all of them. Chevy, Ford, Dodge, and finally Toyota. Getting a good truck is a crap shoot. My last new truck was a 2006 GMC Sierra. I wish I would have kept it, it was a lease. Sucks that you got stuck with a lemon but don't think that Ford will treat you any different. Good luck with your next purchase. By the way, you are going to loose your ass trading that truck in. Been there, done that!