16 votes
Accepted

Why does GM still insist on push rod engines?

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 ...
Zaid's user avatar
  • 39.1k
9 votes

Why does GM still insist on push rod engines?

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 ...
Jim W's user avatar
  • 1,935
6 votes

Resting a radiator on metal brackets

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 ...
Solar Mike's user avatar
  • 34.6k
5 votes

Why does GM still insist on push rod engines?

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 ...
Autistic's user avatar
  • 2,083
4 votes
Accepted

Why would headlights stop working after turning over

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 ...
DeepDeadpool's user avatar
4 votes

Magnetic Active Suspension or Magnetorheological Damper

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 ...
Ben's user avatar
  • 10.7k
3 votes
Accepted

Failure in A/C compressor due to flood?

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)...
Moab's user avatar
  • 7,990
3 votes
Accepted

Where can I get a comprehensive list of GMLAN Symptom category codes?

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 ...
Ben's user avatar
  • 10.7k
3 votes

Valve lifters hitting camshaft when hand cranking

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
Move More Comments Link To Top's user avatar
3 votes

Magnetic Active Suspension or Magnetorheological Damper

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 ...
Steve Matthews's user avatar
3 votes
Accepted

Transfer Case Options 4l60e

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 ...
rpmerf's user avatar
  • 8,403
2 votes

Low beam headlights out, High beam working

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.
Tina Newman's user avatar
2 votes

What action to take when GM Goodwrench breaks something?

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 ...
Moab's user avatar
  • 7,990
2 votes
Accepted

Removing stuck water pump - GM Corsa B

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 ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Removing stuck water pump - GM Corsa B

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. ...
D. SM's user avatar
  • 683
2 votes

Low compression in one cylinder with a misfire code, but no smoke in the exhaust

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 ...
Moab's user avatar
  • 7,990
1 vote

How strict is a "drive cycle"?

While the parameters of a drive cycle are fairly strict, how you get them done usually isn't. What I mean by that is, in order for the drive cycle to complete, you need to hit all of the parameters, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote
Accepted

What could be causing a P0013 engine code to turn on and off on a 2.4L Ecotec in 2014 Buick Verano?

I believe it's the sensor. See this video: Sensor replace He's showing the location of the sensor on the back of the engine here:
jwh20's user avatar
  • 12.1k
1 vote

Cars with no ACC power

Some cars have multiple cigar lighter sockets and then: some will be battery direct, some acc controlled, and some ign controlled. It just depends on how they decide to do it and what current ...
Solar Mike's user avatar
  • 34.6k
1 vote

Failure in A/C compressor due to flood?

It sounds a little odd but....it's possible The oil change has nothing to do with the AC compressor. So rule that out as a cause in your mind. The compressor could get damaged if underwater, it's ...
DucatiKiller's user avatar
  • 32.9k
1 vote
Accepted

Can I spray paint a engine's heat shield?

There are special paints that will withstand temps of 2000 degrees. The problem is to get this type of high temp performance you have to be meticulous in your parts prep. Look for a paint labeled ...
mikes's user avatar
  • 19.9k
1 vote
Accepted

2005 Pontiac Grand Prix GT Radio Theftlock

IIRC There are no button combinations to retrieve a code. The theft lock system has to be reset with a scantool and a new VIN has to be written to the new module. Anyone with a Tech2 or similar ...
Ben's user avatar
  • 10.7k
1 vote

High O2 voltage paired with high LTFT reading

The O2 reading is odd given the LTFT, but if it were me I would start with the obvious basics... The KISS rule is and always will be in full effect. Check for vaccuum leaks. Even small ones. That ...
SteveRacer's user avatar
  • 12.4k
1 vote

2000 Pontiac Grand Prix Idles at a higher temp than normal

Slight overtemp corrected by moving the vehicle suggests to me that your cooling system is not operating properly and that it needs the extra cooling coming from moving air. Inspect the following: ...
tlhIngan's user avatar
  • 12.2k
1 vote
Accepted

GM power steering fluid -- what kind do I need?

Short Answer 89021185 is compatible with 89021184 (and both are now superseded by part# 19329450). Long Answer I talked to GM parts department and they told me the 98021184 part number has been ...
theforestecologist's user avatar
1 vote

GM power steering fluid -- what kind do I need?

There really isn't anything fancy you will need for an 07 G6. Some European cars will use CHFS11 and Honda will have it's own blend, but other than that you can use a universal power steering fluid, ...
TheTechGuy99's user avatar
1 vote

01 Grand Prix No Crank when it sits in the hot Sun

After diagnosis it looks like the ignition switch, when it does the no crank I can hold the key in the start position and wobble the key-lock cylinder around and it will crank, its like it does not ...
Moab's user avatar
  • 7,990
1 vote

GM's "Quad 4" Engine

I don't see it as a "fundementaly flawed" design at all. One of the first mass-production DOHC 4-bangers, and over about 6 years they only made about a quad-drillion of them. The early ones were ...
SteveRacer's user avatar
  • 12.4k
1 vote
Accepted

Live scan tool for OBD 1.5 GM transitional?

I have an Actron CP9145 that reads obd 1.5 on my 1995 GMC Jimmy. does not read ABS or Airbag though. Bought it new for $135 a couple of years ago. Don't remember if I got it on Ebay or Amazon. I know ...
frank's user avatar
  • 26

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