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16

Car and Driver asked this very question to GM's Sam Winegarden, chief engineer for small-block V8's. The advantages of a push-rod valvetrain mentioned in the article can be summarized as follows: It allows for a more compact engine layout The camshaft sits in the "valley" of the engine, making use of free space. Because the engine doesn't have to place ...


9

Put a DOHC head next to a pushrod head and the answer is immediately obvious. The heads from pushrod V8s seem impossibly tiny if you've only ever seen DOHC heads before. And since the block doesn't actually take up that much space in the overall size of the engine, shrinking the heads makes an enormous difference in the overall size and weight of the engine. ...


6

The main thing the higher pressure cap will do is to increase the boiling point of the coolant slightly. 3psi isn't going to make a huge difference, but it will make some difference. If your cooling system is in good shape, the higher pressure unlikely to cause problems. If your cooling system is already on the way out, well, then it'll be on the way out a ...


6

All engines shipped from GM since January 2006 carry the newer 58x reluctor wheel. If you have an early LS2 (PN 12499750) then it's considered an '05 engine and will carry the 24x reluctor wheel like the LS1 and LS6 variants. This is important to know when you start shopping around for a computer to run your engine. Any LS engine can be converted either way ...


6

The vibration from the engine and driving will cause fretting which will wear away at the metal of the radiator. The softer metal will wear faster and will eventually make a hole in the base, most probably causing the base to crack and support for the radiator structure to fail. Fit the rubber feet : you may find that all you need to do is to release the ...


5

The OHC engine has advantage over the OHV engine at higher revs .The same is true when comparing side valve to OHV .Smaller engines need the revs more and have more to gain by being OHC .The cost penalty of OHC is less on an inline 4 which is the most common small car engine.The OHC engine uses up more space in relation to its cubic capacity .Remember that ...


5

As Brian alluded to in his comment, in most cases it will not work. You have to have a reader which will read OBD-I. Some readers, like the Innova 3140 will read both, and comes with all of the adapters to attach to the "older" vehicles. Brian also stated about the change to OBD-II. In the US it was mandated to change over in '96. Some manufactures changed ...


4

I can't speak for GM, but one reason they may be doing it is that they have a reputation for overheating under heavy use (heavy towing on the trucks and track days for the cars) amongst motorsports enthusiasts. Bumping it up a few psi is relatively safe for the cars and may well be enough to help keep the overheating under control.


4

Turns out what went wrong was my car was turning on the brights (highs) when I would go to unlock it, and the regular (lows) headlights were never working. I thought the car was turning on the lows when I went to unlock it. New bulbs fixed the problem. Little anecdote: I was extra perplexed when I was pulled over at night for driving using my fog lights, ...


4

As others mentioned the dampers are controlled by an electromagnetic coil (two coils in newer designs). As current is applied the fluid becomes more viscous leading to more damping. This technology is still currently in use in Corvettes as an option, as well as in other makes and models. The GM system is relatively simple only takings a few inputs (Four ...


3

I realize this answer isn't as complete as you want, but hopefully it can point you in the right direction. So it appears this transmission was used in most (if not all) Chevy and GM trucks from 92 on. Most (if not all) of those trucks were available with 4wd. I have a 97 suburban with 4wd. It does have the dash button shift, but I've heard it was ...


3

I believe the way it works is that the fluid within the damper is filled with what basically amounts to iron filings. During normal operation, these float about, suspended within the liquid and not doing much. A highpowered electro-magnet is embedded within the design of the damper body / shroud and when current is applied, the magnetic force changes the ...


3

By changing the flow of electricity through the magnetic fluid in the dampers, the viscosity of the fluid is changed. As the viscosity is changed, it becomes harder or easier for the suspension to be compressed, thereby allowing the suspension characteristics to be changed. Because this is controlled with an electric current, it can be changed hundreds of ...


3

The Twinport Ecotech engine is the second generation of the GM Family 0 engine technology (also called Family Zero ... haha, could even be "Family Zed" in the right parts of the world, eh?). It works by having the ability to close off one of the two intake ports near the intake valve at low engine speeds, which speeds up the air entering the cylinder and ...


3

The bulb modules could actually be bad, despite both filaments coming on in high beam mode. Pull the connector at each bulb, there will be three wires: tan, green and black. The black is ground, tan is low and green is high. Make sure there is power on the tan wire when the headlights are on and the high/low switch is set to low. If the tan wire is hot, ...


3

AC systems are hermetically sealed, no way for water to intrude the system especially if the system has any charge at all. It could however damage the electrical part of the compressor (clutch magnet) or other parts of the AC electrical system like relays, wiring or switches.


3

Completely normal. You have hydraulic lifters they take oil pressure to work.They will take up the slack that is causing the noise. See this video for an better explanation


3

Outside of paid service information like ProDemand or AllData, I think you'll have very little luck finding this information. Here's a sample from a 2012 Impala. The list is too long to post the whole thing, but you can infer the meaning of some of the symptom codes from it. U0073 71 ECU HS Bus Off U0073 72 ECU LS Bus Off U0100 00 Lost ...


2

Odometer tampering always has been and will probably always be possible. The only thing likely to change is the difficulty involved (and perhaps the legal penalties for doing it). If the perpetrator doesn't thoroughly cover their tracks, you might find hints that something isn't right by checking service records and Carfax (or similar services). Oil ...


2

Definitely sounds like the spark plugs or ignition coil to me. My father owns a mechanic shop in Boston and when my car was doing the SAME exact thing in the winter, he just replaced a certain spark plug and ignition coil that went bad and everything was all better. You won't know for sure without checking. If you know what burned out spark plugs will look ...


2

You need to find the RPO (Regular Production Options) list on the Service Parts Identification label. Similar to what is pictured below. It will likely be on the spare tire cover or the glove box, but may also be in the door jam or under some other compartment lid. Each on of those three digit number/letters indicates an option the car is equipped with on ...


2

My suggestion is to check the fuse first...it's fuse #14 for low beams. If it "pops" out then you will have no low beams. Same for high beams. The two have two different fuses.


2

If you have any doubt at all that the RPO code sticker is accurate (like, maybe someone swapped the rear differential), you can tell an ordinary open diff from an LSD by jacking up the rear end of the car, releasing the parking brake, and turning each rear wheel in turn, leaving the other one free to turn by itself. With an open differential, the opposite ...


2

My suspicions would lean more towards debris left in the block. Most salvage yards by their nature are not particularly clean. My thoughts would a rodent nest or other debris. Another possibility is not a clog but an air pocket that has settled in the heater core. If you check this site for no heat links you may find some info on determining how to resolve ...


2

Just replace the injector plug. I believe it should look like this: You can order it from RockAuto.com for ~$6 (I'm sure you can get it from many other places as well. I would soldier this in place using heat shrink to seal them up. As far as the gaskets go, your vehicle uses the gaskets with the rubber-ish sealing portion (don't know what they are made ...


2

Well: When I reinstalled the engine harness and connected it back to the engine bay fuse block, I didn't properly tighten the five bolts that secure the connectors to the fuse panel. Apparently it was therefor not correctly grounded. Yay. Thanks everyone for the help!


2

I think the damage was intentional, I see pliers marks on the plastic, have seen this type of marking many times. They are the parallel lines in the image below, made by the plier jaws. Not sure if they had to do it or were taking a shortcut at your expense. What you can do about it? Talk to the service manager about it, if they blow you off or don't get ...


2

Pull valve cover for #3, remove both rocker arms for #3, pull the spark plug and apply compressed air (100lbs) into the cylinder #3, listen for a air leak sound in the exhaust tail pipe, Intake manifold or crankcase. Exhaust= Exhaust valve problem Intake= Intake valve problem Crankcase= Piston ring failure Two more things can cause low compression, ...


2

If you want to hammer it out, I suggest a rubber mallet. With a metal hammer the force of impact may transfer through the water pump and break other parts you are not intending to replace. Alternatively, look for a spot where you can insert a long pry bar (e.g. something that looks like https://www.amazon.com/4-Piece-Mechanic-Dicfeos-Thicker-Strike/dp/...


2

If you have removed the three bolts surrounding the water pump, and the ultimate goal is to replace the water pump with a new one, just use a hammer and hit the water pump pulley. It should pop right off. You are not worried about the pump itself, because it is getting replaced. There should be a gasket residually holding the pump in place. You just need to ...


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