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Chevy Silverado and GMC Sierra Starting Problems

193 messages,  Last post on Nov 16, 2009 at 4:26 PM

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What is this discussion about? Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Silverado 2500, Truck

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#165 of 193 Rough Idle on cold start by jerald227 Sep 02, 2009 (10:19 pm)
I have a brand new 2009 silverado 1500 series with 5.3 v-8. On cold starts it has a significant rough idle for 10 to 30 seconds. I have had it to the dealer 3 times and there are no computer codes to give them a fix for it. They just say it is normal, but I know if they had just spent 25K of there hard earned money on a new truck that shakes like that they would not call it normal. Apparently I am not the only one, one service manager told me that I was not the only complaining about this. If anyone else reads this and are having the same issue, I would a appreciate a response, especially if you have found an answer for it. I am fixing to have my first oil change and I am going to switch to synthetic, hoping this might help. I called GM today and they are going to get into this. A little hope anyway. If I get a solution for this I will post it. Shaking In San Antonio. Replies to this message: rjo1 (Sep 15, 2009 9:18 pm)
#166 of 193 Re: Rough Idle on cold start [jerald227] by rjo1 Sep 15, 2009 (9:18 pm)
Replying to: jerald227 (Sep 02, 2009 10:19 pm) I have also experienced this issue with my brand new 2009 silverado 1500 series (4.8 L V-8 LS), which I purchased in July. I live in Houston, TX and I started noticing a significant rough idle in the mornings soon after I brought the truck home. After a few weeks of no improvement, I took the truck to the dealership to diagnose the problem. They told me, after keeping the truck overnite, that they did feel the rough idle on startup; however, they also said that this symptom was normal. When I said that this was definitely not normal they responded by saying that there were no engine codes showing up in the computer which meant that there was nothing wrong with the truck. Their explanation for the rough idle was that the truck's internal computer feeds the engine a rich fuel mixture on a cold startup, which consequently causes a brief rough idle. Once the computer is up and running (after a few seconds) then it corrects itself. My response was "why would GM engineer a truck to do something like this?" I then asked if they would let me start up a truck on the lot that had not been run in a couple of days (for comparison). They took me to a brand new single cab silverado with a 5.4 liter V-8, which also had a rough idle for about 10 seconds (although it was not as rough as my truck). I have never experienced this symptom in any other car or truck that I have driven and my gut feeling is that there is definitely something wrong that GM should look into and fix. I now have about 2500 miles on my truck and I still notice a bit of a rough Idle in the mornings. I have also noticed that the rough idle is more pronounced if the air conditioning is on during startup. Please advise if anyone finds a solution to this problem.
#167 of 193 silverado starting problems by jeof Sep 16, 2009 (12:31 pm)
I have an 04 Silverado 2500HD that intermittently fails to start. On the first try it will crank without starting, on the next several tries it won't crank. The lights light up, radio, etc, just no cranking. After a few tries it may crank and start or crank and not start. At first this only lasted 5 or ten minutes then it would start and I would be on my way. Now I have to let it sit for a couple hours. The only other thing I notice (when it doesnt start) is that when you turn the key on, the fuel gauge shows E. When you turn the key on AND it shows the correct fuel level, you can be sure it will start. Any ideas or solutions would be appreciated. Dealer doesn't seem to be able to find any thing and it doesn't do it ALL the time, just when you are in a hurry!! Thanks Replies to this message: obyone (Sep 16, 2009 1:05 pm) davethecarnut (Sep 23, 2009 10:24 pm) obyone (Sep 24, 2009 1:52 am)
#168 of 193 Re: silverado starting problems [jeof] by obyone Sep 16, 2009 (1:05 pm)
Replying to: jeof (Sep 16, 2009 12:31 pm) Sounds like a bad throttle position sensor. Course this is just a guess based on what you stated. As far as the relationship between the gas gauge reading empty and the truck not starting is something I've never seen or heard of. Coincidence? Maybe. Replies to this message: davethecarnut (Sep 23, 2009 10:24 pm) obyone (Sep 24, 2009 1:52 am)
#169 of 193 Re: Rougher than usual idle at start on brand new 2009 Silverado 1500 LS [jerald227] by jrdfc1 Sep 21, 2009 (12:05 pm)
Replying to: jerald227 (Sep 02, 2009 1:54 pm) I have a 2009 2500HD Silverado with similar problems not only will mine run rough for the first few minutes but the limited slip will go in and out, the traction control flashes trouble and makes the traction lock up and then the ABS lights up and locks on the brakes. Now they have it in service and cannot find any problems. Any ideas other than taking it back or crushing it?
#170 of 193 1996 Chevy z71 will turn over but not start by olblue20 Sep 23, 2009 (2:10 pm)
My truck will turn over fine but wont start. most of the time when i turn my key on my gauges dont kick on. every once in a while they will though, usually when i turn the key very slow. i replaced the fuel filter and fuel pump thinking it was a fuel issue. also switched out what was believed to be the ignition module under the hood on a bracket near the distributor. could this be the ignition itself on the steering column?
#171 of 193 continuation of the previous post by olblue20 Sep 23, 2009 (2:12 pm)
forgot to mention that i have gotten it to start once or twice usually when the gauges will actually kick on, but if i turn the truck off and try to start it again it just continues to turn over.
#172 of 193 Re: silverado starting problems [obyone] by davethecarnut Sep 23, 2009 (10:24 pm)
Replying to: obyone (Sep 16, 2009 1:05 pm) Hey obyone, Where is the throttle position sensor located? I know...I should subscribe to Chiltons or that Alldata place...but you're cheaper Replies to this message: obyone (Sep 24, 2009 1:52 am)
#173 of 193 Re: silverado starting problems [davethecarnut] by obyone Sep 24, 2009 (1:52 am)
Replying to: davethecarnut (Sep 23, 2009 10:24 pm) TPS is located on the throttle body.
#174 of 193 95 C1500 start problem by jhl385 Oct 06, 2009 (8:35 am)
I only get a click at the starter when trying to start my truck. This started with a bad battery, but I replaced it with a new one yesterday converting it to a top post. The starter is a rebuilt one replaced this spring and I pulled it today and had it checked - it's fine. So I though maybe the cable from the battery to the starter is bad and I used jumper cables to go from the neg. post on the starter to the battery and left the OE cable in place. Same thing happened, hit the ign. start position and only a click at the starter. I even "borrowed" another starter from the parts store and it did exactly the same thing. Any ideas what I can check now? Thanks.

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