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Questions tagged [pressure]

Physical force applied over an area. Frequently referring to the force that compressed air exerts on the interior of a vehicle's tires and expressed in units such as pounds per square inch (psi) or Newtons per square meter (1 Pascal).

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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 30-...
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4answers
5k views

Why nitrogen and not carbon dioxide is used in critical tire applications?

In critical applications tires are inflated using pure nitrogen (link). But carbon dioxide (CO2) is a larger molecule (will leak slower from the tire), as well as inert (will not oxidize rim and will ...
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7answers
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Should the inflation pressure for low profile tires be the same as for regular tires?

I always thought that even if you go the large wheel + low profile tire route one should keep the pressure to what's recommended by the manufacturer. However I noticed that some people swear by ...
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2answers
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How does tire pressure affect susceptility to hydroplane?

Is a tire's propensity to hydroplane proportional or inversely proportional to tire pressure? That is, if a tire is over inflated or under inflated, is it more or less likely to hydroplane?Edit: This ...
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5answers
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How critical is it to match the stock fuel pressure regulator pressure when replacing it?

My fuel pressure regulator needs replacing, however the original part from the manufacturer is outrageously expensive. While looking for less financially painful alternatives I've seen much cheaper ...
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3answers
102k views

Low-side and high-side pressures lower than expected after AC repair

I just did my first automotive AC repair, after the compressor in my 2004 Lancer 2.0 ate itself, cracked its casing, and blew all the refrigerant out. I think I did the repair & recharge ...
11
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1answer
754 views

Radial tires: Do they bulge at too high pressure?

It's tire pressure time! At least when looking at the recent new questions. So here is another question about air pressure. At driving schools, shops and in the internet you often find this type of ...
11
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1answer
437 views

Tyre Valve Pin Too Far In

I just bought a second-hand car, and when I got it home I tried to check the tyre pressures, with a simple mechanical pressure gauge like this, which I've used for years on previous cars with no issue....
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3answers
1k views

Direct Injection Injectors - How do they prevent blow back into the fuel system?

So I imagine a direct injection injector as a fuel injector squirting fuel directly into the combustion chamber. The amount of pressure in the combustion chamber would seem to be enough to push the ...
10
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1answer
70k views

Checking Tire Pressure when the tire is warm or cold

Witnessed a recent debate about what is the appropriate temperature to check tire pressure at. The debate centered around warm or cold, there wasn't an exact temperature given by any of the parties. ...
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1answer
688 views

Does free revving a diesel engine to 4000 rpm (1.6 crdi- hyundai) cause any damage?

It's a Hyundai CRETA/ ix25 model... clocked 1800kms on the odometer, diesel spec engine 1.6 crdi unit, manual transmission! It has redline at about 4800rpm in the tachometer. When i took it for ...
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3answers
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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 ...
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2answers
380 views

Does high air pressure throw off wheel balance?

The tire shop balanced my tires at 41 psi, when my recommended psi is 30. I have since lowered it to specification, but would this throw off the balance?
7
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1answer
890 views

What pressure should i run in my winter rally tyres?

I'm going to buy and run for the first time a winter rally spiked tyre of 145 80 r13, and I was wondering what pressures do people generally use rallying in low winter temperatures on snowy terrain? ...
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2answers
1k views

Showing Oil Pressure When Engine Cold and Not Running

I noticed a strange problem on my motorcycle last night. I have a 2006 ZX-10R and as I was leaving work, I noticed the oil pressure warning was not on. Normally, as soon as you turn the key to the on ...
6
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1answer
7k views

Difference between fuel pressure and fuel rail pressure

In OBD PID wiki page, there are 2 PIDs listed: Fuel pressure and Fuel rail pressure. Are both of them the same? Can someone please give an elaborate explanation of it - What exactly are they ...
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1answer
1k views

Why does a tire have the same air pressure when mounted on the car and when not?

The other day I inflated my tires up to 34psi and then when I took one of them off the car. I measured the pressure again to check how much the difference was, and I was surprised that it was still 34 ...
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1answer
1k views

2010 TDI Jetta Strange A/C Pressure Readings

I recently replaced the compressor and dryer at the suggestion of a nearby shop. I've charged the system and the high side reads a solid 100psi the low side cycles between 70 - 110. Cycle time is ...
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2answers
264 views

Tire Pressure Adjustments When Needed

From my understanding there is the recommended tire pressures at the inner part of the drivers door, but I have this question in my head just in case this happens. Say my recommended tire pressure ...
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3answers
3k views

Why is a volume test necessary when diagnosing fuel delivery problems?

I suspect my fuel pump causing intermittent driveability issues. I checked the fuel pressure at the fuel rail and it seems like the pressure is fine: ~2.4 bar at idle, 3.1 bar at engine off (3.09 bar ...
5
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1answer
88 views

Tire showing low pressure after few KMs of ride

I am having this question from long back. I am using N2 for my tyres. After a few KM (say some 3-4 KMs), measuring the PSI, shows a less pressure. Whether, due to the increase in the temperature in ...
5
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1answer
472 views

Fuel Rail Pressure dropping & engine shutting down - Whats the cause?

Lately my car had shut down its engine mutiple times while I was driving. Before shutting down it felt like I took of my feet from the gas pedal and then pressed it again althrough I always was on ...
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0answers
1k views

Diesel fuel pressure issue Fiat Punto 1.3 JTD [closed]

I have a Fiat Punto 188 1.3 JTD Multijet and an issue, that brings me a headache since 2 years. The car is from 2005 and already has 180 000 miles down. Almost every time, the I fast accelerate from ...
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2answers
2k views

What could be causing the rapid loss of tyre pressure?

I had a slow puncture a while ago and got the tyre replaced on my Renault Clio because it was bulging and non salvageable. Since then I've been losing pressure in that tyre fairly rapidly. I've had ...
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2answers
900 views

Diesel, fuel pressure drops at speed

Now its my turn.. Volvo 2.0 diesel Siemens VDO When car gets warm, in 4th - 6th gear, the car starts shaking between 1800 - 2200 rpm, no warning lights. Diagnostics show that the fuel pressure drops ...
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1answer
2k views

Do I follow the same recommended tire pressure when I change to nitrogen filled tires?

I am aware of the recommended tire pressure indicated in the car's user manual and in the driver's door. I've been reading a lot about filling tires with nitrogen and a few of the advantages has ...
4
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3answers
470 views

Can I add a gasket to my exhaust valve to reduce leak and increase cylinder pressure?

So I have a single cylinder diesel engine. We do not use it to produce power (it is operated by an electric motor) but to measure the pressure at low rpm (100-200). The volumetric compression ratio is ...
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0answers
140 views

Honda Civic 2002 Coolant sprinkles back from Rad cap

I am having issues with this car, so I am reaching out to masses out there who could share some of their wisdom to help me understand the actual issue with this car. It has 262K miles on it. Issue ...
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6answers
996 views

Tyre Pressure Checks for My Car

I know that checking tyre pressure is a very important thing before making long journeys. However, I have no idea how frequently I should check my tyre pressures. For example, If I travel round-trip ...
3
votes
3answers
6k views

Should I let air out of my tires?

I bought a car brand new 9 months ago. My tire pressure sensor came on. I checked the tire pressure, and it was at 35 PSI. My maximum tire pressure is 51 PSI with a warning not to fill above 40 PSI. I ...
3
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4answers
20k views

Does tyre pressure affect road noise?

I always pump my tyres up to the maximum (like 45 bar), for maximum fuel economy. However, does this affect road noise?
3
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1answer
445 views

Can I still drive my car when one of the tires has lower pressure?

I just noticed this morning that one of my tire pressure dropped a little bit. The others are 34psi, but the front right tire is only 30psi, I checked them only few days ago, they were the same at ...
3
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1answer
138 views

Oil pressure light on Golf R Mark 7

This morning my car stalled when I turned on the engine (left it in gear the night before, stupid me) and my oil pressure light came up for a few seconds then it disappeared. Will it be fine?
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1answer
279 views

What can I do to get the oil pump to work?

I replaced the oil pump on a Volvo 240. The oil pump is down in the oil pan underneath the engine. I followed the Haynes manual which said to prime the pump with Vaseline. I put everything back ...
3
votes
1answer
3k views

Cold weather tire pressure adjustment

I live in a mild-weather area (typical summer temp about 80F/25C, winter 55F/+15C), but occasionally travel to the mountains where temperatures are below freezing (5F/-15C). The cold temperature ...
3
votes
1answer
954 views

Tire pressure sensor doesn't read

I work on several makes and models, and found that after replacing brake pads that the "low tire pressure" warning comes on as a sensor fault. Is there something I'm hitting that causes this? How can ...
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2answers
1k views

Hydraulic fluid reservoir caps

Hydraulic fluid needs to be kept clean of foreign debris to avoid damaging/destroying hydraulic fluid lines. It is also known to be hydrophillic; Absorbing water leads to a lower boiling point, which ...
2
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1answer
2k views

Checking a fuel pressure regulator that is out of the car

I happen to have a fuel pressure regulator of a petrol car lying around left by the previous owner and suspect that it might be still good, since the previous owner was just changing parts randomly ...
2
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0answers
129 views

Can pressure caused by temperature cause ignition coils to unseat?

I've got a Rotax engine that looks like this from the top: The ignition coils look like this when removed: Recently two of the three ignition coils unseated after approximately 10 minutes of ...
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0answers
1k views

My upper radiator hose is never pressurized but car never over heats…?

I'm stumped, it doesn't effect the car and no overheating or mechanical issues. Lower one is pressurized but not the top? 06 Impala police package. Do the police versions have bigger radiators and ...
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0answers
74 views

Why is there no pressure in my 06 Chevy Impala…?

Boy, what a day I had. Roads were real slippery today in Texas and I skidded and lost control. Next thing you know, I'm in a ditch full of grass, dirt and rocks. I'm still amazed at how little damage ...
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5answers
63k views

lowest tire pressure for a 44psi tire

I want to know what it the lowest tire pressure you could put on a maximum rate 44psi tire? I have been placing 33- 34 psi on these tires for about half a year now, will it damage my tires? I'm ...
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1answer
68 views

Is there a tyre pressure gauge that is easy to use?

I always lose air from a tyre when I try to use one of the type of pressure gauge that depress the pin in the valve as the gauge is attached, so I have to pump it up whether or not the pressure was ...
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1answer
62 views

Tire pressure with tires on vs off the car

Today, I changed to summer tires on my Toyota RAV4 hybrid. Usually I check the air pressure after changing the tires (well, wheels, actually) with the tires on the car. However, today I instead ...
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1answer
426 views

How to choose Car Tyre Pressure Monitor Valve Stem Cap Sensor Indicator

I would like to fit Car Tyre Pressure Monitor Valve Stem Cap Sensor Indicators to my Skoda Citigo, where the cold tyre pressure is supposed to be 26 p.s.i. There is a wide range of these available, ...
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1answer
75 views

2002 Sub Forester S 2.5 AT Huge power loss going up hills

Can anyone tell me what the fuel pressure should be (40lbs ?) on a 2.5 AT Sub Forester. Any hill I hit the power drops to nothing and the cruise control shuts off (which I understand, it is suppose to)...
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1answer
119 views

What is the pin layout / labels of this oil gauge?

I have a veglia oil pressure gauge from a fiat coupe 16v. On the reverse of the clock is 4 pins, the top and left ones are labeled negative and positive respectivly, but can anyone tell me what the ...
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1answer
687 views

good tire pressure for agressive driving

Apparently my current rear tire (talon, some cheap brand) seems to be out of round lately. I have been replacing it with the same tire from the same brand and I notice that every time I drive on deep ...
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0answers
38 views

How much to inflate essentially unlabeled tires?

My trailer tires are labelled only with the following: Carlisle made in USA 6.90-9 That's it - there is no max PSI, # of plies, load rating, or any other information at all that I can see. The ...
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2answers
72 views

2004 Chrysler Sebring Coolant Overflow

So my dad and I replaced the thermostat, outlet housing, and radiator within the past month (all went bad at once) So ever since replacing the system, we have been noticing that as we put coolant in ...