12
votes
2answers
107 views

What is meant by degreeing a cam?

In the hot rodding world, "degreeing the cam" is an often used term when installing an aftermarket camshaft. What does the term mean, what does it do for you, why should you do it, and what are the ...
6
votes
3answers
360 views

How To Pump Up Car Tires (finding the optimal PSI for your tires)

I have noticed that all the tires on my VW Passat B5 have "44 PSI" written on them except the spare that has "51 PSI". This seems incredibly high to me so when I filled them up recently at the petrol ...
8
votes
1answer
116 views

Tire Speed Rating Naming Convention

According to an answer on this page the speed ratings that can appear on the end of a tire specification (like "195/65R15 91 V") include almost all of the letters of the alphalphabet in almost the ...
9
votes
2answers
128 views

headlights come on by themselves when car sitting in sun

if sitting in the sun on a hot day, my family's 1995 Mazda protege 323's headlights will come on, even though they are not switched on. This occurs with the car off, and the keys out. The simple way ...
7
votes
2answers
68 views

Honda R8X-S heat seize

I've got a Honda R8X that heat seizes when I'm riding it when it goes over 40mph. The lad I got it off said he had it re-bored and that it was run in. Will I need to re-bore this again or is there ...
10
votes
2answers
489 views

Why won't my engine rotate?

After doing some maintenance on a 2000 Porsche 911 engine (3.4l normally aspirated), I find that I can manually rotate it with a wrench on the flywheel, to a certain point but no farther and I can't ...
8
votes
1answer
61 views

2000 Suzuki Grand Vitara 4x4 flashing

Whenever i engage my 4x4, the 4x4 light flashes. It didn't used to do this. Its annoying watching it flash. Any ideas what could be causing it to flash?
9
votes
1answer
104 views

How can I secure the power block for my LED headlights?

I purchased an LED low-beam conversion kit and installed it yesterday in my 2010 Forester. The installation was easy enough, other than having to move the battery to get enough space to fit my ...
5
votes
2answers
110 views

Awful sound when coming to a stop even after brake pads and discs replaced

I have a Vauxhall zafira which I bought a year ago. I was told upon buying the vehicle that its pads and discs would need replacing soon so I changed them straight away (with genuine Vauxhall ones, ...
4
votes
2answers
186 views

What does the letter at the end of a tire code signify? [duplicate]

Take the following tire codes, for instance: 195/65R15 91 V 245/40R18 97 Y What does the "V" signify? What other letter codes are there?
24
votes
1answer
2k views

Why are the blades of old car radiator fans unevenly spaced?

Fans that look like this: Is it to somehow help the balance of the engine?
20
votes
2answers
979 views

How To Read Car Tires

On my VW Passat B5 tires, there is a marking that reads "195/65R15 91 V". What does this mean? Do I have to get replacement tires with this exact marking on the side of the tire in the future or not? ...
1
vote
1answer
41 views

2004 VW Passat B5 How To Choose New Wheels

I am thinking about getting some new alloy wheels for my car. How do I find out what rim sizes or specifications are compatible with my car? Or any car for that matter? I found these stats on ...
11
votes
2answers
234 views

2013 Toyota Tacoma flashing 4x4 light on dash

My friends Tacoma has the flashing green 4x4 light going on the dash. I read the instructions regarding putting it into 4 wheel drive, 2 wheel drive and 4x4 low and nothing changed. We drove it to an ...
10
votes
1answer
112 views

Formula 1 valve trains

There was a statement in a post regarding Formula 1 valve trains being pneumatic or magnetic. Are there valve trains driven magnetically or pneumatically that are on the market? When did they start ...
8
votes
2answers
153 views

Is it healthy to drive with a bad IAC? [closed]

My IAC is bad and in order to keep my car running while a stop sign/light is to have one foot on the brake and one foot on the gas. Is this an effective fix to travel until I get it fixed? Or ...
4
votes
2answers
246 views

LED lights on same switch [closed]

I'm trying to wire 4 low voltage LED lights in a vehicle. I would like all 4 lights to come on with one switch, and only 2 of the 4 lights with another switch. I could also use one switch if it has ...
8
votes
1answer
83 views

How does Valve Overlap affect emissions?

In this question, it is suggested that valve overlap can affect emissions. In what way can valve overlap affect emissions?
9
votes
2answers
435 views

Why do Formula 1 cars use engines with many volumetrically small cylinders?

What's the benefit to Formula 1 using engines like a 3.0L V8 or a 2.4L V8? I read this Reddit discussion on why it's not practical to put small many-cylindered engines into production cars. Cost ...
6
votes
1answer
115 views

Battery light on after new alternator

Car: 2003 Honda Civic Si G1Wh dash cam, 400w amp, 4300k HIDs My alternator failed badly (stereo cutting off), no battery light. Replaced it with a reman Duralast, battery light is on. It shows 14.5v ...
13
votes
4answers
1k views

Should I fill my tire?

I measured the PSI on my rear driver tire (using a gauge pin - push it into the needle and a stick pops out with a reading), and I got a reading of 22 PSI. My tires are supposed to be anywhere from ...
5
votes
1answer
73 views

How to choose the best jack stands and wheel chocks for a vehicle?

Some people say that when choosing jack stands/wheel chocks, we should always leave plenty of room above the vehicle weight. For example, if the car is 1.5 tons, we should choose jack stands with a ...
6
votes
1answer
37 views

On-Board Diagnostics (OBD) Readiness Monitors

I would like to know how does apps like Torque calculate if my car (Hyundai i10 Era) is 'Not ready' yet? What are the factors (complete list) do one checks to decide? Is there any formula to calculate ...
10
votes
1answer
60 views

What Can I Learn From Exhaust Manifold Temps?

I was wondering what I can learn from the temperatures on the individual exhaust pipes coming out of each cylinder. The question is general, and my specific example is on my 98 Mazda 626 GF 2L. Last ...
4
votes
2answers
105 views

Pontiac G6 sounds like a prop plane. Wheel bearing?

My '06 G6 has an airplane-like sound that comes from the passenger front end. I already know it's a wheel bearing, but how urgent is this kind of repair? I'm concerned about fuel economy and safety. ...
11
votes
1answer
107 views

How does a dynamometer work?

I don't have much to add here. Pretty simple. How does a dynamometer work? How are Horsepower and Torque measured as separate figures during a single dyno run? There are quite a few components and ...
15
votes
1answer
121 views

Dynamometer Question - How is it operated and what are they doing?

When guys are doing dyno runs they to do it in a gear, interact with the keyboard and then do it again in another gear. It seems they do multiple runs in multiple gears. In this post Paulster ...
2
votes
1answer
47 views

Will using premium gas increase gas mileage? [duplicate]

Is it possible to get higher gas mpg in RX350 by using premium gasoline ? It seems to, but don't know how it works and don't know how much more I get since one day is not the same as another. Are ...
7
votes
1answer
37 views

2010 dodge ram 1500 reg./E-85

I let my wife put gas in the car and she thought it was E-85. But she put eco-diesel gas (only) 5.00 dollars worth so my guess maybe 2 gallons now my truck smokes a lot and wants to shut off. I bought ...
10
votes
1answer
217 views

Are there downsides to making an accessory socket always live, if accessories are removed when not in use?

In some cars, the power line from the battery to the accessory outlet (aka cigarette lighter socket) is always live. In others, it's off until ignition. It seems pretty much random which cars are ...
3
votes
1answer
74 views

Premium vs. regular in medium compression engines

We probably all know that using premium grade gasoline in a low compression engine (less than 9.5:1) is nothing but a waste of money, but what about medium compression engines with a compression ratio ...
6
votes
1answer
55 views

2001 Clio Leaky Roof - Sunroof issue?

Driving on the motorway at the weekend I discovered a leak in the ceiling of my '51 plate Clio. The leak is located roughly an inch forwards from where the passenger sunshade sits when stowed. Its ...
6
votes
2answers
460 views

How to replace front fog light housing on a Corsa C 2005

I need to replace my front fog light housing before my MOT as it's completely ruined. What is the best way to do this? DO I need to take the entire bumper off? The image below is what I'm ...
4
votes
1answer
99 views

In the US, how do I tell if a car is in good condition?

Say I am planning to buy a used car in the US. How do I judge the car is in good condition? Are there a specific set of documents I should ask for? What are the tests I can conduct before deciding ...
8
votes
1answer
686 views

How to use an engine stand

This is one thing which I have asked many times on a car forum and never received a satisfactory response for. I know that the engine block is somehow bolted onto an engine stand like the one ...
7
votes
0answers
44 views

Fiat Siena EL 2001 was starting but jerking very bad whist running [closed]

Fiat Siena EL 2001 model It has a starting problem, I'm really desperate to get it running again, please help. The car was starting and running but was jerking very bad when in 2nd gear. The ...
5
votes
1answer
61 views

Replaced a ton of parts - grey/white/black exhaust smoke and funny noise persist

I've replaced my Corsa Bakkie's cylinder head, changed plugs & oil, cleaned the petrol pump, replaced everything that I could. There is still a funny noise (like the sound when you put a card at ...
13
votes
2answers
153 views

Cold temperatures and tire pressure light

I have 2013 Nissan Rogue. I live in Toronto, Canada, so it is very cold here right now. I understand that cold temperatures can cause the tire pressure light to come on, but will it actually affect ...
7
votes
2answers
522 views

Two-Stroke Diesel Engine - Do they use forced induction on them?

As I have indicated before, I'm very diesel ignorant. I just know the basics, very basics. In a two-stroke diesel engine using forced induction seems necessary but at the same time I see challenges. ...
8
votes
2answers
148 views

Mazda B3000 (Ranger) Truck takes several tries to start?

I have a 2002 Mazda B3000 (essentially a Ford Ranger) that almost never starts on the first attempt. Usually it takes 2 or 3 tries before the car finally turns over. Each time I hold in the crank I ...
6
votes
1answer
159 views

Two-Stroke vs. Four-Stroke Diesel Engines - What is most commonly used in heavy vehicles?

I am not well versed in diesel engines. To prove my point, I've learned in the last month that a two-stroke diesel engine actually exists. My Question. What kind of diesel engine (four-stroke or ...
9
votes
1answer
102 views

What is Lobe Separation Angle (LSA)?

What is Lobe Separation Angle (LSA) and how is it used in camshaft design? How is it measured? What difference does a long or short LSA make?
6
votes
1answer
104 views

What is the average radiator capacity on 6 cylinder engines?

Yesterday I drained the radiator on a 99 Monte Carlo. Owner's manual states that it should take 11.6 quarts (2.85 gallons). I removed the petcock, flushed the system by running a hose into the top ...
4
votes
1answer
49 views

2004 V8 LT Chevy Suburban No Heat at Idle

I have a 2004 Chevy Suburban that had no heat in the front or rear at idle. I found this mechanics stack exchange article, discovered I was low on coolant and now I have heat in the front when idle ...
3
votes
1answer
34 views

1998 Nissan Sentra transmission

Why does a 1998 Nissan Sentra Automatic transmission change to neutral from reverse while going downhill? This just started a couple of weeks ago. The engine shut off the first couple of times it ...
8
votes
4answers
701 views

Is control module voltage and battery voltage the same?

Is the Control Module Voltage (from OBD Mode 01 PID 42) and battery voltage the same? If not, what is the relation between them? Why is the max value of Control Module Voltage (from OBD Mode 01 PID ...
10
votes
1answer
499 views

How to detect engine/ignition (on/off) status using OBD2?

My device needs to know when a car engine/ignition is started and stopped. Is it possible to get that status using OBD2? If yes, which PID will give me that information? Do I need to write any ...
4
votes
1answer
71 views

New Case - Watered the battery and got rust on one of the engine pipe

I bought new car and I added battery water to level. But some spilled on the engine and one of pipe got effected and it has rust on it. I went to mechanic, he told me to apply diesel on it. I did, ...
7
votes
2answers
116 views

Normal Operating Temp for an Automatic Transmission

While I was able to find information on testing the ATF temperature sensor in the GF4A-EL manual I've got: I was unable to find any info on the normal operating temperature of the transmission. ...
6
votes
2answers
137 views

AirbBag and 4x4 light is on after changing BMW X3 battery. Why?

After I changed my BMW X3 2008 battery at home the 4x4 and AirBag light is on. Any ideas why? Some people claim that changing BMW x3 battery is not straight forward, however, they don't explicitly ...

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