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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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2000 Suburban brake “Imbalance” issue

My son-in-law has a 2000 Suburban. We replaced all 4 rotors and pads as well as the left rear caliper. The caliper was replaced because upon completion of the initial brake job during the test drive ...
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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?
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Will or regular oil help increase oil pressure than synthetic oil?

Will regular oil help increase oil pressure in my engine than synthetic oil?
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Fuel rail pressure low on common rail diesel

The engine can suddenly cut out when driving and either go into safe mode or stop altogether. Have changed pressure sensor, pressure regulator and fuel filter with no joy. Sometimes engine won't start ...
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While giving accelerator it is not moving faster as it like

I own a second hand Pulsar 220 bike ,while I am giving accelerator more it is not moving fast as well as performance is down.and getting sound form there. It is engine , clutch plates ,and carburettor ...
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Troubleshooting low engine power uphills

my 02 Corolla (230k miles) has low power, especially uphills. I did a vacuum test and fuel pressure test, as I was suspecting a clogged exhaust or a faulty fuel pump. Both readings are normal, ...
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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 ...
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2015 ford 6.7 no start was running fine now it cranks but no fuel?

I just got a 2015 superiority. It was driving fine. I shut it off now it cranks but won't start. Sounds like no compression, Yen I spray start fluid it starts for a sec then dies
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Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?
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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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1answer
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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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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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873 views

Honda Civic Ex AC low pressure side too low

I added two cans of R134 (24 oz) clutch kicks on but only warm air out. High pressure sticks on 120 psi but low side drops off to negative 5, and the compressor is noisy. What could it be? Do I need ...
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Oil pressure blowing through filter gasket, but gauge shows pressure is ok

As I'm getting ready for breaking the engine I just rebuilt (Skoda Estelle/120 '70s, RWD, rear mounted engine) I wanted to start checking things before firing it, even before cranking it. I made a rod ...
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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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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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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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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 ...
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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 ...
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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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How much pressure is needed to force the piston down in an ICE? [closed]

I know it's different on most cars but what are the force needed on cars you have or worked on.. Is there an average range? I get compression ratios but neee to know the actual force needed to drive ...
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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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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 ...
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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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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 ...
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Chevy Silverado Fuel Pressure Is Erratic With Rough Idle Only When In Gear

I have a Chevy Silverado 2500 with the 6.0L engine and it has been idling rough. When I put it in gear the RPMs start fluctuating and the truck wants to stall out. Once the truck is running down the ...
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884 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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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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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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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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How much pressure in ATMs is acting when a combustion happen?

When a combustion happens inside the chamber how much pressure is the moles exerting inside the close container? How could one figure this out?
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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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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 ...
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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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994 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 ...
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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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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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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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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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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 ...
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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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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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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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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 ...
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1k 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 ...
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259 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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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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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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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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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 ...