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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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2 votes
2 answers
332 views

Low fuel pressure in Volvo S40 1999

My car is Volvo S40 1999 with 2.0 engine. The fuel pressure is on the idle at 2.2-2.3 bars (should be 2.5) and on higher rpm max. 2.6-2.7 bars (should be 3.0). When I unplug the hose that goes from ...
1 vote
2 answers
718 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 ...
1 vote
1 answer
983 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 ...
1 vote
1 answer
162 views

5 months old Royal Enfield 350 cc stopped all of the sudden

I have 5 month old Royal Enfield 350cc with only 4600 km. My bike stopped in the middle of the highway ... fuel was leaking ... I went to the service center they told me there is an issues with fuel ...
1 vote
1 answer
192 views

Normal AC refrigerant pressure range?

Long story short: the ac of my 2013 Rogue is not working and I am in the process of eliminating various possibilities. One of these is the amount of refrigerant in the system. Hence my question: With ...
2 votes
2 answers
592 views

Atkinson Cycle: Does the efficiency of a high-compression engine come from compression ratio, expansion ratio, or both?

I understand that, in an internal combustion engine, efficiency can often (up to a point) be improved by increasing the compression ratio, this being a major reason why diesel engines (which do not ...
2 votes
1 answer
287 views

Tire Pressure Monitors during very cold temperatures

As outside temperature decreases by 10 degrees Fahrenheit, tire pressure decreases 1 psi. However, in very cold temperatures of -10 degrees Fahrenheit, the vehicle TPMS indicates low pressure but the ...
0 votes
2 answers
156 views

1PSI per week air loss

Is it normal to lose up to 1psi per week in a car tyre ? All my other tyres seem to retain the pressure but one tyre which I had a puncture plugged months ago seems to lose just under 1psi per week
2 votes
5 answers
780 views

When does the spark plug ignite the air fuel mixture?

Some people say it's at the end of the compression stroke, some people say beginning of the power stroke.. What do you guys think ?
1 vote
1 answer
178 views

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?
0 votes
0 answers
24 views

Oil gauge jumps up and down when the motor gets hot and it’s getting hot quickly

Oil pressure goes up and down when my c2500 gets hot and it’s been getting hot quickly the hot part is the head gasket why the oil gauge
1 vote
0 answers
39 views

25%/70ms dropouts in fuel pressure in Cummins ISL 07

The first picture is low idle, the second is high idle. With the exception of the spikes, the high idle looks more normal to me. Anyone know what this signifies? I just replaced the PRV which was ...
1 vote
1 answer
460 views

Why is there a MIN and MAX marking on a car coolant bottle?

I've always thought the minimum and maximum mark on the coolant bottle were quite pointless as it doesn't seem to make much of a difference to the function of the vehicle if I overfill a little bit or ...
0 votes
1 answer
83 views

What happens when the air-fuel mixture ignites but the piston/crankshaft briefly can't move?

With engines such as in lawnmowers or motorboats (or even manual gearbox cars when the clutch is fully released), what does typically happen when there's a sudden increase in resistance during or ...
0 votes
0 answers
778 views

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 ...
1 vote
2 answers
75 views

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, ...
0 votes
1 answer
47 views

No clutch presure, new master cylinder and slave cylinder, no leaks, no air in the system still loosing presure and clutch [closed]

Hyandai grand max. We replaced the master and slave cylinder new parts in. No leaks no air in the system still it looses pressure and clutch we have adjusted everything and tried evry possible ...
0 votes
1 answer
787 views

Does a diameter of a brake line affect braking pressure

I am currently building a brake system for a vehicle ground up and I know that the diameter of the master cylinder would affect the braking force proportionally to the area of the master cylinder. But ...
12 votes
7 answers
88k views

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 ...
3 votes
1 answer
90 views

What type is this compressed air/pneumatic connector?

I need to build an adapter for this connector, however, I wasn't able to identify it. I measured it with a digital caliper. It doesn't seem to be a common connector, at least in Germany. Can you ...
2 votes
0 answers
363 views

Is Honda Accord gen 8 A/C Pressure Switch replacement DIY safe?

I have a Honda Accord 2008. I followed the Service Manual and identified that there is no continuity between the terminals of the A/C Pressure Switch. Since the refrigerant was only refilled last year,...
2 votes
1 answer
4k 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 ...
14 votes
2 answers
141k 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. ...
14 votes
5 answers
10k 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 ...
10 votes
9 answers
3k views

Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?

It's a strange dilemma, but if the power of an engine is determined by the difference in pressure between the combustion chamber and the exhaust, it should follow that turbocharging should be equally ...
1 vote
0 answers
490 views

Mazda 6 MZR-CD diesel fuel issue

I have a mazda 6 mzr-cd turbo diesel wagon 2009 model. I just purchased the car and after trying to jump the car i thought the engine had no compression. However after trying again with a stronger ...
15 votes
4 answers
173k 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 ...
3 votes
5 answers
36k 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?
12 votes
2 answers
11k views

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 ...
3 votes
7 answers
122k 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 ...
1 vote
1 answer
89 views

Tire pressure and new tires

I bought new tires in September. I have returned to the place I purchased them many times due to malfunctions. I feel like I am putting air in my tires all of the time. I know with temperature change ...
1 vote
1 answer
406 views

Are the high and low fuel pressure sensors the same part?

I have a 2013 Ford Escape 1.6L se 2wd, my question is the high fuel pressure sensor and the low fuel pressure sensor the same part? My mechanic gave me a part # bm5z9f972a and the part # for the high ...
1 vote
0 answers
3k views

What is a valid range for Intake Manifold Pressure while driving on +60mph?

So today I was monitoring my car data and logging everything, when I was driving on the highway going +60mph and on ~2500RPM, my intake manifold pressure read +10Psi. I read it's usually near 5Psi. On ...
6 votes
1 answer
913 views

Tire pressure with load and heat

Running a ram 2500 pulling 10,000lbs 5th wheeler...truck door sticker and tire call for 80psi... when pulling the trailer in the summer the heat of the road increases the psi to 90 is that safe or ...
1 vote
1 answer
720 views

Is it safe to use the AC if the pressure is too high?

My dealer replaced the AC compressor in my 1997 Accord recently. However, they said the pressure in the system is too high due to contamination and I need to replace several other parts of the AC ...
6 votes
1 answer
2k 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 ...
1 vote
1 answer
110 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 ...
4 votes
1 answer
3k 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 ...
0 votes
0 answers
73 views

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 ...
7 votes
2 answers
6k 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?
0 votes
0 answers
89 views

Will or regular oil help increase oil pressure than synthetic oil?

Will regular oil help increase oil pressure in my engine than synthetic oil?
0 votes
0 answers
22 views

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 ...
11 votes
5 answers
8k views

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 ...
3 votes
3 answers
657 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 ...
1 vote
0 answers
687 views

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
4 votes
1 answer
3k 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 ...
6 votes
1 answer
15k 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 ...
3 votes
3 answers
8k 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 ...
1 vote
0 answers
1k 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 ...
2 votes
0 answers
440 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 ...