Questions tagged [diesel]

A type of internal combustion engine where ignition happens when fuel is spray at high pressure into a compressed charge of air, or the relatively heavy fuel oil used in compression-ignition engines.

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60
votes
7answers
19k views

What to check when buying a used car?

I'm looking to buy a used car. What do you think I should check (mechanically) before buying it (especially if it's diesel)?
49
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6answers
45k views

Why do heavy vehicles almost always use diesel engines?

I have always wondered why heavy vehicles such as large trucks and buses almost always use diesel engines, whereas in light cars there is a choice between diesel and gasoline engines. Engine ...
11
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6answers
30k views

Why does a diesel sound like that?

My car is in the shop for a repair, and they gave me a loaner. It's a Chevy Cruze Diesel. Sitting on the driveway, my wife said, "It sounds like a truck". It does. So what exactly it is about ...
17
votes
2answers
5k views

Diesel Engine Runaway - What is it?

I was watching some youtube videos and diesel engine runaway videos started to pop up where apparently the diesel engine runs out of control until it destroys itself. My Question What is diesel ...
17
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3answers
64k views

How to test for defective glow plugs?

On a diesel engine, how can I know which glow plugs are defective, and can I change these only?
17
votes
5answers
9k views

Why not use gasoline on diesel engines or vice versa?

I've read gasoline engines use sparks to ignite the mixture, but diesel engines use just compression which can't be done in gasoline engines due to high compression ratios which can cause engine ...
14
votes
4answers
41k views

What's the cause of Diesels' typical clatter noise?

I guess it's related to their basically running off knocking, but if I were to explain it to someone like this, it wouldn't convince me neither. [Edit] From http://www.ford-trucks.com/forums/369700-...
12
votes
6answers
82k views

Is it normal for the oil to be dark in color right after an “oil change” in a 10-year old diesel car?

I took my 2002 Jetta TDI wagon to a neighborhood shop about 10 miles, 24 hours ago. They supposedly changed the oil, but the color is very dark, almost black. Definitely not light-colored/transparent. ...
0
votes
0answers
44 views

Why did car go quiter and cut out after fuel change?

I did a fuel change and during it was concerned that I may have put diesel in my petrol car because it wasn't clear which pipe was which. However the handle was green and said unleaded so I guess it ...
16
votes
3answers
34k views

Why does diesel engine have redline much lower than petrol engine redline?

Why do diesel automotive engines redline at around 4500 rpm whereas petrol ones go to 6500-8000 rpm? Does this have something to do with the compression ratio?
11
votes
3answers
14k views

Why don't all diesel engines have throttle plates?

I learned recently that many older and some newer diesels don't have throttle plates to control airflow. I was also quite shocked to learn about a condition called diesel engine runaway. Apparently ...
7
votes
6answers
14k views

Why do Diesel engines have a higher compression ratio than gasoline engines?

Are Diesel engines constructed differently, so that they have a higher stroke volume? (longer stroke, smaller combustion chamber etc.) I know the main differences between Diesel and Gasoline engines(...
7
votes
2answers
785 views

Are there any modern diesel engines that require electricity to continue running?

I was reading this question about an owner checking the alternator by disconnecting the battery, which is an easy way to validate on a gasoline engine. The single answer assumes that the OP is ...
7
votes
1answer
8k views

Ford Focus engine cuts out at 3000+ RPM

I should provide a little background to this issue as I believe the two are most likely related. The car is a Ford Focus 2008 1.6 TDCi Diesel (UK) which this year has had a brand new battery and ...
7
votes
2answers
2k views

Would a non-turbo diesel perform better in high altitudes than a comparable gasoline engine?

I live close to the Rocky Mountains and drive into them quite often. I have a small naturally-aspirated four-banger that tends to lose a very noticeable amount of power getting into the higher ...
5
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2answers
6k views

Diesel engine timing?

A petrol engine can fire the spark plugs slightly earlier or later to account for factors like revolution speed and engine temperature. However a diesel only fires when the mixture is compressed. ...
5
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2answers
2k views

Accidently put biodiesel fuel in 2009 Nissan Altima. What to do?

I made a really stupid mistake earlier tonight. I was at a gas station refueling my 2009 Nissan Altima (2.5L 4-cylinder engine). I stupidly selected the only option that was available at the pump ...
5
votes
2answers
4k views

BMW 330D 2001 E46 Turbo Charger not working as expected after changing

I have a problem with my car. My car: BMW 330D, 135kw, 2001 year, E46. A week ago my turbo charger got broken when I was driving. There was a lot of white smoke going out of exhaust and there was no ...
5
votes
2answers
1k views

Does the a gasoline or diesel engine supply fuel at high speeds when not pressing the pedal and more

Let say I directly connect a small engine to my bicycle, and that I'm superman who can overcome any force. Then I start cycling (using my legs...) - the engine starts to rotate, even though I haven't "...
4
votes
2answers
4k views

How to increase the lifespan of a diesel turbo?

Replacing a diesel engine's turbo costs a lot of money. How should a diesel car's owner drive, park and take care to insure that he/she gets the maximum km/miles out of his/her car's turbo?
3
votes
1answer
429 views

VW Golf 2001 Mk4 Diesel ASR Engine Problem

I've spent a crazy amount of money on my car lately and I still have the same problem. I've replaced the: Catalyst Converter Radiator Starter Motor EGR Valve Track Rod ends & Wheel Bearings The ...
1
vote
2answers
68 views

Device that prevents vehicle from draining accessory batteries?

Not exactly sure if the device / component or setup I'm asking about even exists. But, here is my naive question (I am bad with electrical in general): Is there something built into modern vehicle ...
1
vote
1answer
20k views

Car not accelerating and over revving

I have a Ford Fiesta 2010 Diesel 1.4. Recently the car has been struggle to accelerate when the gas pedal is being pressed. The engine still roars and the indicator will shoot up, but the car just ...
1
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1answer
2k views

Low biting point after clutch change Ford Fiesta

Background story So, long story short my clutch went one day whilst I was driving on the motorway. The car hit about 60 and wouldn't drive faster and gradually slowed down. I pulled in at the next ...