28th May 2008, 20:42

I've got the 2001 GMC 2500HD and just picked it up.

It has 201,000kms on it and runs good, but has a weird intermittent engine misfire (or so it seems).

If I start truck after it has sat for a while, it will run fine and I can drive away.

But If I start it, let it idle for a little while, it will all of a sudden start to shake as if a bad misfire is happening.

Anyone have any ideas?

No check engine light being emitted.

--> Also have the infamous ABS problem

--> Tow/Haul was not working, but I spliced the orange wire in the column as suggested and it works now. (Thank you)

Seems like a solid truck, but I would love to know how to fix this random misfire issue I'm having...

She's got all new plugs and wires.. Any ideas?

30th Jun 2008, 22:09

I have a 99 LS Z71... answer to the comment above, I too had a problem with it seeming like a misfire, and the idle would sputter and go up and down at a stop.

After 3 years of trying to get mechanics to fix it, one an uncle, I was out about $1500 and nothing was solved.

Took it in to get a new battery that was under warranty, and the mechanic said my fuel pressure regulator was leaking, why any other mechanic couldn't figure it out I don't know. But I put a new FPR on and it starts and idles fine now, it was about $50 at O'Reillys and took 2 minutes to put on.

So I would try that before spending what I did at a shop. I've also had the gauge problems everyone is talking about. It's the fuel, battery, temp, sometimes oil gauges that would just go out and come back intermittently and the security, ABS, low fuel, and battery lights would come on. I think it's finally out because it hasn't come back on for 5 days now.

I wish Chevy would take better care of their customers, this is ridiculous and I won't pay 700-1200 to fix it, it's just not worth it.

159k on it and these are the only problems I've really had with it, knock on wood.

I'm going to try and test my alternator and check to see if there are any loose connections anywhere. I'll get back with any results, don't hold your breath though.

19th Jul 2008, 11:30

I also have a 1999 Chevy Silverado Z71. It has 125,000 miles on it and I have had a few of the irritating problems happen that have been mentioned so far.

Around 97,000 miles the gas gauge went crazy, and it sometimes reads right and sometimes doesn't. I was told it was an expensive fix, so I haven't tried to find the solution.

Although now I think I am ready, it's just so annoying. All I have to do is drop the truck in neutral whenever it reads low fuel, and it usually reads right then. It's more aggravating trying to keep up with how much fuel I actually do have in my tank when it really does get low.

I have had the throttle body cleaned because of the sticking gas pedal. And just recently, the digital mileage and gear selection instrumentation randomly won't light up upon start up. I just smack the top of the dash and then it lights up. Another very annoying issue.

I wish Chevrolet would fix all these problems, under warranty or not. I'm not to proud of their work on this particular model.

Other than that, no other issues as of yet. "knock on wood"!

31st Aug 2008, 01:04

My family has had a 1999 Chevy Silverado 1500 Extended Cab since new. Currently it has 200,000 miles on it. While I feel I'm lucky I haven't had all of the problems, I've had some.

Before 30,000 miles, while making a sharp turn in a parking lot, the power steering pump bit the dust and was repaired under warranty. After the power steering pump broke, the truck has had an on-again, off-again high pitched squeal; we've replaced all of the tensioners, idlers, and other pulleys to no avail. Extreme hot or extreme cold quiets the condition.

At about 32,000 miles, the transmission required a rebuild, which was carried out under warranty as well.

Brakes have been serviced twice.

Somewhere in there, the fuel regulator went out, which caused the following effects:

Cold start - Immediate Starting

Warm Start - 20-30 seconds of cranking before starting

Warm-Hot Weather - shuddering and shaking, similar to perhaps a vapor lock situation

Replaced the regulator about 20,000 miles ago, and its been happy since.

Cooling system went on the fritz around 190,000 with major overheating problems; turned out it was only a dirty radiator and bad water pump.

A/C went out around 185,000 miles, and I haven't taken it in to be repaired yet.

Around 150,000 miles, the front end of the truck was submerged during a flood, and the net result was a bad Airbag sensor, still haven't had it worked on or replaced.

The tail gate latch broke early on, and I've noticed many GM pickups with the black plastic removed from around the handle.

Other than that, we've been pretty happy with it.

14th Sep 2008, 20:21

I just bought a used 99 Z71 extended cab 4X4. The Service 4X4 light keeps coming on and off? I just heard from a buddy that the torque converters are garbage, and it's guaranteed I'll need some pricey tranny work. I thought I was buying a good truck? WOW, it seems every comment I read in here is the same. Why hasn't GM had a recall on these problems?

19th Sep 2008, 11:45

I own a 99 Silverado 1500, extended cab short bed. Just rolled 260,000 miles. Pull a 38', 10,000lb camper with it. Had the ABS problem, had it fixed at Chevy dealer for $700.00. Had the fuel gauge issue, problem is the sensor and fuel pump are only sold as a unit. Dropped the gas tank and replaced the unit for $300.00 and 6 hours labor. Will soon replace the original set of brakes. So far it has been a good truck, hope to keep going to match the wifes car. Hers now has 360,000 mile on it (92 Olds cutlass).

21st Sep 2008, 17:59

I've had a few of the problems mentioned here. About a year ago the Service 4WD light came on. On 99 models this is usually the 4WD switch on the dash and is a fairly easy thing to fix. Try and replace that before getting the transfer case torn open you'll save a lot of money.

I have the failing fuel gauge too, but haven't fixed it yet. Also had e-brake work done and repaired a front strut bracket that broke a weld.

6th Oct 2008, 13:14

I have a '99 1500 silverado. Currently 160k and the 5 speed manual. The trany is whining a lot (sounds like a tractor trailer). I had a new clutch installed and related bearings and the dealer told me that it would quiet down eventually (right). Any recommendations? Also, on the sticky throttle - I found that the mid grade gas at the chevrons works great on that.