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    Alternator or Battery need help

    If your alternator is not charging your rig would die within 30 minutes of running even with a good fully charged battery installed, if you can jump it to get it running & it runs indefinitely your alternator is doing its job That doesn't mean the alternator isn't the source of the key off...
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    Reprogramming question

    If your swapping the engine into a classic car you don't need any of those modules, just the PCM and the factory engine harness modified to delete the irrelevant components & a tune that removes all the interactions with the BCM (which is what communicates with all the other modules and the PCM)
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    Ugghh...several issues and trying to use code reader. Help.

    A traction control message is telling you that the computer sees a malfunction somewhere in the traction control system; so it turned off the system & informs the driver that the system needs repair to resume working The traction control system utilizes many sensors to work, the VSS the ABS...
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    Is Oil Analysis Helpful In Providing Indication of Impending AFM Lifter Failure?

    No, there are no oil analysis indicators that would predict an AFM lifter failure, any oil contamination from a lifter failure would occur because the AFM lifter didn't return to normal operation so that would show up after the fact Low oil pressure or dirty oil increases the likelihood of AFM...
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    Ugghh...several issues and trying to use code reader. Help.

    I've never seen a steering wheel position sensor issue derate an engine, but that doesn't mean some engineer hasn't decided to add that functionality to the code after some specific year A failing electronic throttle control component seems like a more likely scenario but it would throw a...
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    Ugghh...several issues and trying to use code reader. Help.

    This is entirely anecdotal, I use a good scanner before I start changing parts & I advise that to everyone I have found that usually a traction control error without an ABS error is often the steering column centering sensor having a loose plug or corroded terminals; if the ABS light is on as...
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    Just bought a 2012 Z-something Tahoe and may have lied to by dealer? An engine idle thimg.

    If AFM is allowed to function, you will experience a lifter failure at some point where one or more of the AFM lifters doesn't return to normal when the ECM tries to exit AFM mode Disabling AFM does usually extend the amount of time before a lifter failure occurs but the lifter design on the...
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    Problem after installing upgraded radiator

    The OP is troubleshooting a heater that won't blow sufficiently warm air, that TSB is for correcting an OBD code for the engine not warming up fast enough or to the temp the ECM is looking for That code also sets when you replace a thermostat with a colder rating than stock as it only requires...
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    Problem after installing upgraded radiator

    No it's not but it won't effect the heater as the heater core gets circulated water from the block, not the radiator on an LS; that's why you can't block off the heater hoses if the core fails like the old engines, those heater hose ports must be looped if you have to temporarily remove flow...
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    Electrical components life span?

    I have a neighbor who is a great guy but he can't overcome his belief that new parts have a better lifespan than old parts that have not yet failed; the reality today is the opposite but that goes against everything he was taught his whole life; so he keeps changing parts "while he's in their"...
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    Ugghh...several issues and trying to use code reader. Help.

    There's more than 1 fuse to the accessory/cigarette lighter ports, they don't all draw from the same fuse; but one of those ports has its fuse wired as double duty to power the OBD port; that fuse being bad is almost always the cause of a reader not able to connect to the vehicle
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    Problem after installing upgraded radiator

    That small hose is the steam vent, it's not causing your issue Your blend door could be failing to move completely to the heat position, your heater core could be restricted or your thermostat could be stuck open I doubt it's your thermostat because even 140 degree water will blow pretty warm...
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    Misfire after head gasket replacement

    If 1 & 8 are loading up with fuel, those injectors are leaking Yes I know their new, that increases the likelihood of them being bad it doesn't reduce it
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    Bet you cant figure it out - SOLVED

    The stock tune bringing 3 back up until AFM is turned off is odd & would seem to eliminate a harness issue as would the signal trace, buts it's a harness issue because it has to be Make up an external wire for number 3 with a new pin & run it externally from the ECM connector to a new #3...
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    Anybody else less than enthusiastic about the direction Chevy is taking with the Tahoes and suburbans?

    I think the manufacturers are going to be quiet about the changes for the better they can now do until the garbage stuff is mostly sold, they don't want to get stuck all that junk iron they built to please the EPA But my read of recent events is that your absolutely right, it will be very...
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    Disabling the disabler!

    AFM was gimmick to trick the EPA into thinking they hit a CAFE standard that they never hit; so they could keep selling an awesome engine that their customers wanted without a huge penalty It can't improve fuel econony, it can only make it worse; the illusion that fewer cylinders means less...
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    2007 Chevy Tahoe engine swap

    For the engine I think the easiest route would have been deleting the VVT & using all the sensors from the old engine & old ECM, but the tranny swap is going to be tricky if there's no simple way to upgrade to the 6 speed in a 2007 I think trying to replace all of the modules with the 2011...
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    California Mods Questions... E-Fans and Tune?

    California smog test for your vehicle is a visual inspection to see if everything is there, a check via the OBD port to verify the readiness monitors are set & verification that the check engine light is both functional & not illuminated If you meet that criteria you pass, if not you fail; your...
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    L87 Recall - Oil Changed - Engine & Fuel Economy Issue

    You could put 90 weight gear oil in the engine & you wouldn't feel the difference in performance
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    2008 Tahoe runs and then shuts off

    Sounds like a loose or corroded ground
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    Need advice/opinions please help!!!!

    Seafoam won't hydro-lock an engine unless you pour it into the throttle body, there is no place on an LS to rotate the engine with a crowbar; so my guess is whatever he was prying on is broken Pull the belt off & start it, if it sounds normal again fix whatever he broke with the prybar
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    Trying to Pass Smog using O2 extender

    Okay you don't mess with the pre cat O2 sensors, pulling them out of the exhaust stream will report a false lean & the ECM will dump fuel like mad trying to correct it O2 extenders work by pulling the post cat sensor away from the exhaust stream so it reports more oxygen that the pre cat...
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    GMC v. Chevrolet - Does Brand Matter?

    Every component that is not decorative is the same, literally the same, the same production channel, the same part numbers, the same everything that is functional Shop for any part that's not decorative for any year Tahoe & you will see the compatibility list says "Tahoe/Yukon"
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    what‘s wrong with my AC

    No A/C system will make cold air with only 125 psi on the high side & 30 psi on the low side is very near the low pressure cutoff point in the pressure switch You have too much oil if brought it to the spec without doing a full system flush, vacuuming doesn't get all the oil out; just whatever...
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    Impact gun sound and broken AC belt

    It's not a pressure issue, it's an inconsistent pressure issue & sometimes a bad spot on the bushing that isn't noticeable spinning the pulley but when it lines up it sequence with compressor it starts jumping, that makes the tapping sound. A failing spring will also often feel fine when...

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