General Motors Company, commonly known as GM, is an American multinational corporation headquartered in Detroit, Michigan, that designs, manufactures, markets and distributes vehicles and vehicle parts and sells financial services. General Motors produces vehicles in 37 countries under thirteen brands: Alpheon, Chevrolet, Buick, GMC, Cadillac, Holden, HSV, Opel, Vauxhall, Wuling, Baojun, Jie Fang, UzDaewoo.
Questions tagged [gm]
59 questions
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Why does GM still insist on push rod engines?
GM continues to design and produce push rod (Over Head Valve or OHV) engines while most of their competitors have gone to over head cam (OHC) configurations for their performance engines. Is there a known reason for this? Their smaller engines…
Pᴀᴜʟsᴛᴇʀ2
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Can I use an OBD2 Scan Tool on older GM vehicle?
I can get an adapter that connects my OBD2 scan tool to my 12 pin GM scan tool connection. But will the tool be able to read the codes and tell me anything useful? Or do I need to get a scan tool that is also aware of OBD-1 or GM specific codes?
I…
Jim
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Magnetic Active Suspension or Magnetorheological Damper
GM developed magnetic dampers for the Corvette several years back. What is magnetic active suspension and how does it work?
I understand there is a magnetic fluid in the shocks but how, deep down, does this work other than running electricity…
DucatiKiller
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Why would headlights stop working after turning over
I have a 2006 Pontiac G6. When I walk up to the vehicle and unlock it, the headlights turn on.
After I get into the vehicle and turn it over, I cannot turn the headlights back on. Fog beams and turn signals work fine, but I can't turn the low beams…
Raven
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Which Reluctor Wheel on LS Engines?
Around 2005 or 2006, GM started using a 58-tooth reluctor wheel, where before they used a 24-tooth wheel in the LSx based engines (LS1, LS2, LS3, etc.). This wheel is used as a way for the computer to detect where the crankshaft is at in its…
Pᴀᴜʟsᴛᴇʀ2
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5
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1 answer
Valve lifters hitting camshaft when hand cranking
I have a 2000 Chevrolet Malibu 3.1. I changed the head gaskets the intake manifolds and the valve stem seals. Before starting the engine and putting everything 100% back together , I wanted to make sure that nothing would sound before starting.…
Ant Davis
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01 Grand Prix No Crank when it sits in the hot Sun
Strange issue with a 2001 Grand Prix (3.8L vin K)
No crank when the car sits in the hot sun for a few hours, has nothing to do with a engine hot soak. All dash light seem to pilot, just no crank.
If you let it cool off after the sun goes down a bit…
Moab
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GM 4L60-E Rebuild Questions - Part 1
I am in the process of rebuilding my first 4L60-E (I've done a 4L30-E before) and I had a couple questions.
1st: In terms of the input drum pistons I know there are both aluminum and steel models, and that the new steel models need new return…
CyrodiilSavior
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Where can I get a comprehensive list of GMLAN Symptom category codes?
GM and several other manufacturers have added additional information to the 5 digit codes. These are not “codes” but are “Symptom categories”. The DTC symptom is made up of an additional 2 digit code that is place after the 5 digit code (usually…
ElectronicsNewbie
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GM's "Quad 4" Engine
The Quad 4 was a 4-cylinder, 2.3 liter engine GM designed in the late 80's and produced 180-190 hp depending on the level of tune. Impressive numbers on paper when the 5.7 liter V8 engine in the Camaro was barely making 200 hp.
However the…
masospaghetti
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What action to take when GM Goodwrench breaks something?
I'm just back from GM Goodwrench for an airbag recall. The part in question is as you see in the picture.
It looks like a fresh break, and the repair required pealing the carpet partly back, but I cannot prove that they did this break during this…
Calaf
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What is Opel/Vauxhall's TwinPort Technology?
Some Opel Engines come with something called TwinPort Technology.
I guess that this increases power, as the original Z12XE (1.2) engine has 55kW, and the TwinPort (Z12XEP) version engine has 59kW of horsepower.
How does it work?
Why does it work?
Is…
George
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Repair or replace frayed fuel injection wiring harness?
This is on a 2008 Chevy Impala, 3.5L V6, non-flexfuel. Recently got cylinder 1 misfire / ignition failure codes. An investigation revealed that mice had gotten into my garage, made themselves at home under the lower intake manifold, and chewed the…
mrdrbob
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Removing stuck water pump - GM Corsa B
I have a GM Corsa 1.0 MPFI (Brazillian version of the Opel Corsa B) and today I started replacing some parts, including the water pump. I had heard from other owners and mechanics that sometimes this water pump gets stuck because of rust and it's…
IanC
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Can I spray paint a engine's heat shield?
While planning some tasks for "restoring" my engine bay, I noticed one of the things that significantly affect the way it looks is the heat shield. It's rusty, since the corrosion was probably much more accelerated by the heat it's insulating.
My…
IanC
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