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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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#157 of 193 08 GMC STARTING PROBLEMS by mpd266 Jun 14, 2009 (4:29 am)
WHEN I START MY 08 GMC SIERRA, IT SOUNDS LIKE IT CONTINUES TO FIRE. WHILE THIS IS GOING ON, THE MOTOR ALMOST SOUNDS LIKE IT IS "HALF WAY" RUNNING. ONCE THE MOTOR FIRES UP AND RUNS RIGHT YOU CAN SMELL A RICH GAS SMELL. THIS ALL STARTED AFTER I TOOK IT TO THE DEALER WITH A SERVICE ENGINE SOON LIGHT. THE DEALER ADVISED, THE LIGHT CAME ON WHEN I SWITCHED FROM REGULAR GAS TO FLEX FUEL. THE DEALER "REBOOTED" THE COMPUTER AND PREFORMED INJECTION CLEANER. NOW SERVICE ENGINE SOON LIGHT IS OFF BUT I HAVE THIS STARTING PROBLEM. THEY HAVE HAD MY TRUCK FOR A WEEK AND STILL NO WORD. ANY IDEAS?
#158 of 193 Rougher than usual idle at start on brand new 2009 Silverado 1500 LS by turbosquirrel Jun 28, 2009 (1:12 pm)
I have less than 1,700 miles on my new '09 Silverado 1500 (4.8L), and it's starting to give me a fairly rough/jumpy idle when I give it a cold start. I live in Texas so the engine's not *literally* cold by any means. (Highs nearly 110 F this week)   I don't actually have trouble starting it, and the idle does smooth out within 30 seconds or so. It just sounds different than when I first got it, so I'm wondering if this is anything I should be concerned about. Have to admit it does have a better growl to it when first started now, but I'm guessing that's more to do with the muffler breaking in. Replies to this message: jerald227 (Sep 02, 2009 1:54 pm) jrdfc1 (Sep 21, 2009 12:05 pm)
#159 of 193 Spark Plug Wires by u2edub Aug 02, 2009 (1:06 pm)
This should be simple, but I'm having problems removing the spark plug wires/boots from my 2004 5.3L Silverado. Any techniques?? Replies to this message: obyone (Aug 03, 2009 4:06 am) u2edub (Aug 03, 2009 3:11 pm) obyone (Aug 03, 2009 5:09 pm) and 1 more...
#160 of 193 Re: Spark Plug Wires [u2edub] by obyone Aug 03, 2009 (4:06 am)
Replying to: u2edub (Aug 02, 2009 1:06 pm) Go to Checkers and buy one of these:   Replies to this message: u2edub (Aug 03, 2009 3:11 pm) obyone (Aug 03, 2009 5:09 pm) u2edub (Aug 04, 2009 12:25 pm)
#161 of 193 Re: Spark Plug Wires [obyone] by u2edub Aug 03, 2009 (3:11 pm)
Replying to: obyone (Aug 03, 2009 4:06 am) obyone, Thanks! I already bought a pair from Sears that look only slightly different. I'm trying not to damage the wires, but they don't seem to want to budge. I'll keep trying. Replies to this message: obyone (Aug 03, 2009 5:09 pm) u2edub (Aug 04, 2009 12:25 pm)
#162 of 193 Re: Spark Plug Wires [u2edub] by obyone Aug 03, 2009 (5:09 pm)
Replying to: u2edub (Aug 03, 2009 3:11 pm) Since you're removing the wires I'm assuming you're changing the plugs. It might also be a good idea to change the wires while you're at it. Fours years in an engine compartment exposed to the heat from the exhaust manifold could deteriorate even the best of rubber/silicone compounds.   And if you decide to change the wires, you could slice the boot and pry the wire off the plug.   If not, the up/down, left/right motion should eventually loosen the boot enough to extract. Replies to this message: u2edub (Aug 04, 2009 12:25 pm)
#163 of 193 Re: Spark Plug Wires [obyone] by u2edub Aug 04, 2009 (12:25 pm)
Replying to: obyone (Aug 03, 2009 5:09 pm) After several attempts already, my thoughts were to do just that. Replace the wires too. Thanks for the advice!!
#164 of 193 Re: Rougher than usual idle at start on brand new 2009 Silverado 1500 LS [turbosquirrel] by jerald227 Sep 02, 2009 (1:54 pm)
Replying to: turbosquirrel (Jun 28, 2009 1:12 pm) I have a 2009 silverado 1500 with the 5.3 gas not flex fuel with 4000 miles and I am dealing with the same exact problem. I also live in texas and the truck has never seen cold weather. Been to the dealer 3 times and there seems to be no fix for it. they say it in normal range, but i totally disagree. this has been going on since i brought it home. I am now getting gm on it and they are suppose to contact me tomorrow. if i find an answer I will post it. lets raise some cane and get this problem fixed. there are no engine codes on the computer and no service bulletins at the dealer for this. but i suspect there will be because you and I are not the only ones having this problem. good luck. Replies to this message: jrdfc1 (Sep 21, 2009 12:05 pm)
#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.

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