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03-10-2010, 11:36 PM #1
2004 Silverado 5.3L... Jerky shifting 1st to 2nd
I have owned this truck (2004 Silverado 5.3L Z71) for a year now. Ever since I bought it I have noticed that during a slower acceleration from a stop the shift from first to second gear is somewhat to very jerky at times. If I step on the gas a bit more from a standstill it seems to shift more smoothly.
I have just ignored it assuming it was normal as I have no real issues with it, other than the worry that it might be damaging something in the long run?
The previous owner had a 5th wheel in this thing I believe (holes in dash below steering wheel where a brake-assist unit would be mounted, 4 holes in bed liner where 5th wheel would be mounted) and I'm wondering if this jerkyness could be the result of heavy towing or is it just normal as I have assumed?
It is ONLY when shifting from 1st to 2nd gear, and only when accelerating slowly. As well, if I am driving along slowly say right at 20km/h the engine is reving fairly high (around 2000 RPM) and I can tell that it wants to change gears into 2nd but it hesitates until I go a little faster, and then it jerks forward a bit and voila, second gear.
Anyway, just wondering - is this a normal "GM" experience or should I be looking at this more closely?
03-12-2010, 09:30 AM #2
Get your computer scanned for codes. There are several trouble codes that trigger high line pressure which results in a harsh 1-2 shift. All the other shifts will feel fine.Jim
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03-13-2010, 12:01 PM #3
03-16-2010, 03:32 PM #4
Well, I haven't had it scanned for codes yet... however I replaced the spark plugs yesterday and now the jerky shifting is GONE. This sort of makes sense I guess, but can anyone explain to me why new spark plugs would make for smoother gear changes?
I went for a drive today and tried everything; quick acceleration, slow acceleration, driving around the 20km/h range, and nothing. One time coming out of a stop light I could feel it shift form first to 2nd ever so slightly, but many other times there was no way to notice except for the RPM drop!
Who woulda thought that changing the spark plugs (which I was doing just because I didn't know if it had ever been done before on this truck) would solve this problem. I'll watch it for the next month and see if it comes back, but I'm happy!
03-16-2010, 09:01 PM #593 Suburban (Southern Slayer): TBI 350, 4L60E
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03-16-2010, 10:05 PM #6
Yea I was at the dealership today to pick up a part and I asked out of curiousity what they charge there for a code scanning and he said $59.95 CAD JUST to have the codes scanned... if they had to do extra diagnostic work to find the actual problem that would be extra, and THEN the cost of the replacement part and labour to fix it... Think I'll be gettin me one of those scanners lol
Can't complain too much though, they gave me my 8 spark plugs at $12.00 each, discounted from the regular $16.80 each.
03-17-2010, 10:59 AM #7
03-17-2010, 11:10 AM #8
03-17-2010, 08:34 PM #9
My truck does the same hard shift from 1st to 2nd gear. I've also noticed it only does it while cold. Let us know what codes if any you read on the pcm.2005 Chevy Silverado Z71 5.3 ext. cab
03-17-2010, 09:06 PM #10
The truck still seems to have lost this problem for the most part after changing plugs, as I have only felt the 1-2 shift a couple of times, and it is no where near what it was before. Before changing plugs, I had gotten so used to this jerkiness, that I knew EXACTLY when I reached 20km/h (12 mph) and would anticipate the shift without taking my eyes off the road. Now, for the most part, I am actually unaware that it has gone into second gear and I have to look down to notice I'm well above 20km/h.
I took it on a highway and got it up to 110 km/h (68 mph) relatively quickly, and then came to a stoplight. Pulled away from the stoplight ever so slowly, and it shifted without any fuss.
I will be sure to let everyone know what codes are found when I have it scanned on Friday.
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