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Old September 11th, 2011, 04:07 PM   #1
2000Sierra
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2000 Sierra Problems

i recently purchased a 2000 Sierra 1500 4.8 regular cab 4x4, it has a zone 4-6inch lift with 33s. When driving around 40-45 mph the engine seems to flutter is the best i can describe it, i can watch the rpms and they seem to flutter back and forth between 1200 and 1400, it only seems to happen when going 40-45, i asked the guy at the auto parts store and he said by the sounds of it, it sounds like it is trying to shift into overdrive? Also when i try to accelerate around 45 mph its like the engine bogs down for a couple of seconds, then i have to almost floor it to even accelerate. It idles around 500 to 600, and the abs light comes on and off all the time, mostly on but goes off here and there, it still drives and breaks fine, i was thinking maybe a ground wire? but wasnt sure. Any advice would be greatly appreciated.
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Old September 11th, 2011, 04:42 PM   #2
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mine did the rpm change between 1200-1400, when i looked into it the hose from the air filter box to the intake had fallen off and it was getting to much air, the rest sounds like maybe a fuse or bad sensor, take it to a mechanic and have them scan it for codes
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Old September 11th, 2011, 09:53 PM   #3
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How many miles?

I would check the distributer gear for wear for the fluttering problem. Then look at the trany.

For the abs light I would look at the wheel hubs, a good scanner will be able to pick up which side it is.
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Old September 11th, 2011, 11:07 PM   #4
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throttle position sensor or fuel filter for the flutter and any advance auto should be able to scan both engine and abs probs
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Old September 12th, 2011, 11:13 AM   #5
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The abs light is probobly a wheel bearing/hub assembly going bad.
Does the truck do the hesitation thing in drive?or just overdrive?
It could be the torque convertor locking/unlocking.
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Old September 12th, 2011, 11:21 AM   #6
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wadey, there is no dizzy on an LS motor.


do a tune up on the motor, and change the fuel filter.

the gear hunting is common to every truck I've ever driven with a 4L60E. the only time its not been so bad is with a built trans with re-programmed shift points. but then you sacrifice comfort for what I'd consider very firm shifts.
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Old September 12th, 2011, 02:12 PM   #7
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i went to auto zone today and had the codes pulled for the abs, turned out to be the wheel speed sensor. It has 135k miles on it, im planning on doing a tune up this weekend. Almost everyone i talked too has said it is a transmission problem, but would that cause the motor to bog down? Is there a big problem with those transmissions doing that? No other codes were found when they scanned it.
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Old September 12th, 2011, 02:18 PM   #8
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i've also heard that it could be the transmission valve body, because those are known to go bad in these trucks. Thanks for everyone's input.
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Old September 12th, 2011, 02:22 PM   #9
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I thought the valve body issue was on the older trucks. Early 4l60 and 4l60E. Tranny Tom might be able to answer that.

Sounds like fuel filter and TPS sensor. I don't know if those engines have the "normal" TPS though since it is drive by wire if I am not mistaken and might be housed in the throttle body motor.
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Old September 12th, 2011, 03:24 PM   #10
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i just checked the transmission fluid and it was quite a bit over where is supposed to be on the dipstick?
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Old September 12th, 2011, 08:34 PM   #11
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Quote:
Originally Posted by 2000Sierra View Post
i just checked the transmission fluid and it was quite a bit over where is supposed to be on the dipstick?
Was it running?
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Old September 12th, 2011, 10:38 PM   #12
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nope

Last edited by 2000Sierra; September 12th, 2011 at 10:45 PM.
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Old September 13th, 2011, 07:07 AM   #13
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Always check tranny fluid with the vehicle running and it should be warmed up.
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Old September 13th, 2011, 03:34 PM   #14
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theres a spot on the dipstick for when its cold, but i did check it twice and it was still above where it was supposed to be.
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Old September 14th, 2011, 05:14 PM   #15
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Would that wheel speed sensor that is bad cause that flutter i was talking about?
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Old September 15th, 2011, 12:41 AM   #16
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Quote:
Originally Posted by wadey View Post
I would check the distributer gear for wear for the fluttering problem.
That is great advice since the 4.8 does not have a distributor
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Old September 15th, 2011, 12:49 AM   #17
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Quote:
Originally Posted by 2000Sierra View Post
Would that wheel speed sensor that is bad cause that flutter i was talking about?
No, what would cause it though is the oversize tires tricking the computer into thinking it is going faster than it actually is and trying to lock the converter. I would get with waitformeperformance and have a custom tune done on it to calibrate it for your tire size among a host of other things he can do to improve performance, if you send him your computer it will cost a whopping $75 and be the best money you ever spent!

As far as your abs goes find a shop with a abs scanner and see what it reads, bet the farm it is a front wheel hub assembly!

Last edited by Disturban; September 15th, 2011 at 02:28 AM.
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Old September 18th, 2011, 10:21 AM   #18
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I got home yesterday from work and noticed that my fuel gauge was fluctuating and heard a whining noise so i got out and it was coming from the gas tank figured it was the fuel pump going out. Of course it has to be a pain in the ass to get to. Has anybody replaced the in tank fuel pumps? Also could this be what the problem with the fluttering with the engine under load? Also advice on getting the fuel filter off to would be great since im afraid im going to break a line getting it off.
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Old September 18th, 2011, 10:43 AM   #19
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I have had to change the pump my 2000 extended cab three times now Ive got it down to two hours in the drive way my sugestion is to only use the gm or ac delco pump or you will do it again .
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Old September 18th, 2011, 10:44 AM   #20
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You can try to drop the tank by removing the brackets. Or you can remove the front 4 bed bolts and loosen the back 2 and jack up the front of the bed enough to access the pump.
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