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  1. C

    HD Headlight Harnesses w/ 4 High Mod

    Excellent! Hmm, choices! This would be for my 94 GMC K2500, no foglights. I looked at the two versions on page 13. Which do you recommend for a California truck? I'm not too keen on spending an extra $25 for the waterproof version if I don't have to. c
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    HD Headlight Harnesses w/ 4 High Mod

    @pgutier1 Thank you for answering my question! I think I may budget for this, then. Then, perhaps I can save up for a pair of those Brazilian-spec (Arteb?) housings, which apparently are quite a bit better than the typical US-spec ones that exist everywhere here (California), especially the...
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    HD Headlight Harnesses w/ 4 High Mod

    Can I post this here, or should I PM? Having just fixed my headlights (burnt switch contact fixed with cleaning), I'm wondering about improving them so they don't go out again. Does this kit come with installation instructions? If not, where may I find some? c
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    '94 GMC Sierra K2500 Headlights Not Working Right

    Fixed! Apparently all the wiring is OK, and it was the switch. With the help of a friend, I opened up the switch and looked at the contacts. One of them – the main headlight circuit – looked visibly burned. Some quick trial and error determined that the contact was still intact, but was...
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    '94 GMC Sierra K2500 Headlights Not Working Right

    I have yet to actually check any of the wiring, but I'd like to know what, if any parts I should get other than the switch. Connectors? Wiring harnesses? Fuses? Thank you! c
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    '94 Sierra K2500 HVAC Issues

    This is true! It temporarily "fixed itself" because, as I recall, the weather got warmer, which must have loosened the old, sticky grease and allowed the mechanism to work. I didn't look into anything beyond that, though, primarily because life got really busy and I simply didn't have the...
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    '94 Sierra K2500 HVAC Issues

    Well, mine's probably posted upthread, but for clarity and to serve as a reminder, my truck is a 94 GMC Sierra K2500 with 454, electric controls and A/C. c
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    '94 Sierra K2500 HVAC Issues

    Two years, wow! Anyway, I'm reviving this thread to say that the HVAC is stuck again, and this time it seems permanent. It will cycle between defrost and floor, but won't go to the panel vents, so it seems that it's actually partly stuck. Is it new actuator time? c
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    Beware: GM Nightmare - Defective 2024 and 2022 Yukon Diesel

    I've always wondered about that. Who would want such a small car with a puny gas engine that barely gets half the MPGs of a comparatively much larger Toyota Prius? An 80 MPG diesel version, however, makes much more sense. Anyway, speaking of dumb rules, this reminds me of an experience I'd...
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    93 model Odometer motor?

    I don't know if this helps anything, but it might? When I swapped the non-tach cluster for a tach one in my 94, I swapped over the odometer (nothing broke!). When I subsequently took the truck for a test drive with the new cluster, the odometer didn't work, and I didn't understand why. So I...
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    '94 GMC Sierra K2500 Headlights Not Working Right

    Very sound advice! I will order a new switch and either have a look at the wiring myself, or take it to the mechanic (it's due for a tune up anyway, and unfortunately, I'm not equipped, nor do I have much time to do that myself). c
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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

    @Schurkey OK, that makes sense. I've never touched them. I don't know. The PO had died and I bought the truck from a local used car lot, so I never got to see much, if any of the prior repair record. I don't know yet. I'll have to get under there and take a look. It helps very much! OK...
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    Engine Idles Unevenly and Almost Stalls When Cold

    I think I understand now! So it was flashing fast for the first few minutes, then it slowed down, so that must mean it entered closed loop. It is at this point that the problem usually happens (though not always; it seems less common in warmer weather). The interesting thing I noticed is...
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    Engine Idles Unevenly and Almost Stalls When Cold

    Well, less than $500. I can do maybe $200, but less is better. c
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    Engine Idles Unevenly and Almost Stalls When Cold

    Ah, I see. OK. Apparently so. OK. How can I accomplish that without hunting down expensive and hard to find dedicated equipment? As far as a PC-based solution goes, I have a variety of laptops with serial, parallel and USB that can run anything from Windows 9x to 10, so I can use whatever...
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    Engine Idles Unevenly and Almost Stalls When Cold

    Well, I ran the truck, locked into closed loop, until it warmed up a bit, and it was idling like normal, unlike before, when it goes into open loop. So, this suggests an iffy O2 and/or possibly ECT sensor, doesn't it? If needed, at the next opportunity, I can blink out the codes next, after I...
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    Engine Idles Unevenly and Almost Stalls When Cold

    OK, so I'm running the truck with the two pins shorted for open loop I think, and Service Engine Soon is flashing quickly. Is that normal? c
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    Engine Idles Unevenly and Almost Stalls When Cold

    You know, I'm not sure. If I had to guess, I'd say they're probably original. I bought the truck used in 2017, so I'm not totally sure of its maintenance record or repair history before that, so I have no idea if they were ever replaced or not. c
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    Engine Idles Unevenly and Almost Stalls When Cold

    @movietvet Ah, yes, the "paperclip trick". I've heard about it, but I've never actually tried it. I'll see what I can do and report back if I find any codes. c
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    Engine Idles Unevenly and Almost Stalls When Cold

    OK, thanks! Since this is a TBI truck, it is OBD I based. Will parts shops have the tools to scan it? I'm pretty sure the local dealer would, as I took it to them a couple years ago for its major service, but I'd like to avoid involving them for this specific thing if I can, at least for the...
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    Engine Idles Unevenly and Almost Stalls When Cold

    OK, I'll try this out in the next day or two, now that the weather is finally clearing up a bit. But first a quick question (please forgive my ignorance here!): where is the thermostat housing, exactly? Is it where the upper radiator hose connects to the engine? Yes, it does sometimes come...
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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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    '96 K1500 5.7 Crank no start, no changes.

    I'm not super well versed in this, but if, in addition to therr being no power to the fuel pump, there's also no spark and the gauges are reading wrong, it sounds like there could be a bad ground connection somewhere. c
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    1999 Tahoe will bot run... please help

    It could be the computer. Back in early 2020, we were driving our '94 K2500 and parked to talk to someone. When we finished, we tried to restart the truck and move on, but nothing happened. It turned over but it wouldn't start. Eventually it did start, but this happened again later on and...

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