Last post on Feb 19, 2004 at 6:52 AM
You are in the Pickups - Archived Discussions
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Chevrolet Silverado 1500, Chevrolet Silverado 1500HD, Chevrolet Silverado 2500, Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, Exterior, Engine, Interior, Truck
#583 of 877 99 Silverado - "SERVICE 4WD"
Mar 13, 2003 (5:17 am)
Hi everyone - I usually hang out on the Mazda6 board (as you can prolly tell from my name), but my husband owns a 1999 Chevy Silverado 1500 4x4 pickup (not the Z71 version). And since Edmunds has such good advice from other owners, I thought I'd post here.
Last night he was driving home - about a 40-minute drive - and a "SERVICE 4WD" light was lit the entire time. He did not have 4WD in gear at the time. This is the first time it's happened. In the 4 years he's owned this truck (he got it new in April of '99), he's not had to use 4WD very often - only a few times when we had a lot of snow, etc. (we're in Michigan).
Any ideas, before he takes it in to the dealer?
Mar 13, 2003 (5:57 am)
my guess is the 4wd switch. Kinda a common problem on the trucks
Mar 13, 2003 (6:01 am)
Okay - just talked to hubby on the phone. The light was still on this morning, and he was not able to engage the 4WD at all - it stayed in 2WD. Would just the switch not working do this? Or is it a problem with the actual 4WD system?
Mar 13, 2003 (6:38 am)
I have a 2500 4x4 w/6.0L engine. I've averaged 14mpg since new. The truck carries a popup camper and weighs 7550#. Worst mileage was around 10 with plenty of lo-range rock crawling. Highest was 16.5 on a trip.
I suspect empty mileage doesn't concern you much - the truck will probably be full for the trip.
The axle ratio makes almost no difference in mileage. With a closed loop system, the computer feeds the right amount of fuel into the engine - and to travel a given speed it takes a certain amount of power. Basically fuel = power. More fuel, more power. Mostly independent of gear ratio. There is slightly more friction losses at higher rpm, but it is only 10% more rpm and those losses are minimal. Reducing speed from 70 to 68 will have more effect on mileage.
Mar 13, 2003 (10:56 am)
Hey, thanks for that info. I just so happens that a truck camper is what brought on our consideration of a 2500. Imagine my surprise last week when I opened the glove box and the sticker on my 1500 said campers were not recommended. Damn!
I found a great candidate rig within 50 miles...right options, right color, right price. It might work!
#588 of 877 michgndr
Mar 13, 2003 (2:53 pm)
My 2000 Silverado 2500 Ext Cab w/5.3 gets 12 to 16 mpg at best. I have the 3:73 gears and auto trans. Towing my 6600 lb. camper I get 8-10 mpg. Good Luck with the move to Alaska, some day I'll vacation there!
Love the truck ! My profile lists how I equipped my truck.
#589 of 877 Rabbitrun
Mar 13, 2003 (3:05 pm)
8.1 with piston tip ? So GM has changed the name from piston slap to piston tip now. They will do nothing about it other than a engine component warranty if you scream enough, but there was a post either here or on the "GM Engine Knock" board regarding a guy with a knocker that just turned 100k and still running, so maybe it is just an annoyance after all. My 5.3L knocker has 38k but still running strong.
Mar 14, 2003 (6:16 pm)
Your not likely to find the problem randomly. Tell your husband to take his truck to someone with the proper code scan tool. It's the first step in the diagnostic procedure. The tool plugged into the truck provides the mechanic with a code which is matched to a separate reference indicating what the likely problem is and a diagnostic and repair sequence. Don't worry, it could just be a blown fuse. In fact, if he still has the owner's manual, he should be able to find and check the relevant fuses himself. Mine shows at least two. Let us know how it turns out.
#591 of 877 Follow-up, Msg 576
Mar 14, 2003 (8:12 pm)
To repeat black_silver's question...since I'm curious myself. What's the real difference between the 2500 and the 2500HD? What drives the extra capacity?
I've searched the brochure and Chevy's web site (oh so not helpful) and cannot find the answer.
Mar 15, 2003 (7:19 am)
2500HD has a one ton rated frame.