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    '94 GMC Sierra K2500 Headlights Not Working Right

    Same truck ('94 K2500, (7.4L) 454 V8. Was trying to drive it last night, and about 2 minutes in, I began to smell a faint odor of something getting hot. A couple minutes later, the headlights started to go out, and that faint odor of something hot started smelling like burning electronics, so...
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    Engine Idles Unevenly and Almost Stalls When Cold

    1994 GMC Sierra K2500 w/ 7.4L. It had been serviced thoroughly a couple years ago with new distributor, new plugs and wires, and a bunch of other things I don't remember anymore. It runs well once it's warmed up, but on a cold start, it will idle high for a bit like normal, and then when it...
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    New Oil Leak at Radiator

    I was checking under the hood today to make sure everything was in order, and I discovered a leak in what I believe is the upper engine oil cooler hose: The metal fitting that joins the rubber hose to the radiator also seems to be loose at the radiator end (I can swing it back and forth): (I...
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    Engine Wiring Harnesses Randomly Popping Loose?

    My '94 K2500, once the major bugs were worked out (new water pump, distributor rotor+cap+wires, ignition coil, radiator, alternator and transmission), has been mechanically rock solid (good engine, decent body, nice interior), but every now and then, a sensor wire will pop loose under the hood...
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    Seats

    The front bucket seats in my '94 K2500 are very nice cosmetically (little to no fading of the upholstery), but they're not super comfortable. I think the foam is getting old and giving out, because it doesn't seem to offer very good support, especially on the back (driving it for more than an...
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    1994 K2500 454 7.4L Proper Oil Pressure When Hot?

    I'm curious because when I first start the engine, the oil pressure gauge reads just over 40, but as the engine warms up, it slowly drops until it sort of just sits just above 0. It fluctuates a bit with engine RPMs, which I think is normal. I don't think that dropping to near zero when hot is...
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    Engine Running a Bit Rough After New Transmission

    I haven't mentioned this before, because I was hoping it would go away. It got a bit less pronounced, but it didn't go away completely. So, since the engine (454) ran smoothly before, could it be an off balance torque converter? Or is it simply in need of a tuneup, because the new...
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    Alternator Died. Why?

    So I was driving uphill today, and the battery warning light came on and the volt gauge went low. Apparently it's the alternator, but I'm not sure what would've caused it to die so suddenly. Short of the alt itself sortof breaking internally, is there a fuse somewhere that could've blown...
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    '94 Sierra K2500 HVAC Issues

    I'm not exactly sure what happened, but when I was running the truck the other day, the windshield was fogged up, so I tried turning on the HVAC to defrost it. Well, the blower came on, but the airflow seemed to get stuck somewhere in between the blower and the defrost vent, meaning no air was...
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    Loud Whine from Transmission Today

    I was heading back with a friend from the local transfer station, when about half way home, I started hearing a horrendous whine coming from the transmission, like it wasn't getting enough fluid. It was still shifting okay when it shifted, but it felt a bit sluggish and "sticky" (ie, it kind of...
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    Upgrading to an Instrument Cluster with a Tachometer

    I'm considering upgrading my K2500's stock cluster, which is the speedometer-only version, to that with a tachometer. However, I don't know what, if any, compatibility issues there are, given that there was a fairly wide range of models that used various different engines, both V6 and V8. I...
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    Hazard Flashers Stop Flashing When Brake Is Applied - Flaw or Feature?

    Lots of questions here.... So, I don't know if this is normal behavior, but when I have the hazards on, they stop flashing when I put my foot on the brake. Is this by design, or some kind of problem caused by the aftermarket trailer brake controller I have (whose make/model I can't recall at...
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    speedometer reads ~3 MPH slow

    Hi, My 94 K2500 Sierra's speedometer seems to be reading about 3 to 5 MPH slow. Is this fixable by replacing the instrument cluster, or is it something related to the VSS sensor, transmission or ECM? If I can fix the problem with a new cluster, this will be a good excuse to get one with a...
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    Hi!

    I came across this forum while searching for a way to add an aux input to the stock stereo, and my first few posts were in that context. So, I figured I'd post a quick introduction of my truck, at least. My truck is a 94 GMC Sierra K2500 with the 454, 7.4L big block and automatic...

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