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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48
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7answers
8k 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)?
7
votes
3answers
2k views

What kind of engine oil should one use in a diesel?

I got an 1987 Toyota Land Cruiser with a 2H diesel engine. I never changed oil on a diesel engine prior to this truck, so I'm a little confused. Toyota Factory Shop Manual recommend API CC oil type, ...
8
votes
2answers
62 views

Proper glow plug operation

Are glow plugs supposed to stay on after the engine has started to help with the firing of the first few revolutions?
4
votes
0answers
49 views

1989 7.3 IDI wont start

I have a 1987 F250 with a 1989 7.3 IDI swap, the truck always used to run great. I went outside to try and fire her up and she wont start. I've tried plugging in the block heater and using ether. It ...
2
votes
2answers
317 views

Formula to calculate emission rates

OBD tells whether I have passed the emission test or not. I want to know the formula by which it calculates the rate of CO, NOx, HC emission from my car and compares it with some set threshold value ...
6
votes
1answer
145 views

Volvo S80 II 2.4 D5 DPF (Diesel Particulate Filter) regeneration conditions

What are the conditions required for the DPF (Diesel Particulate Filter) regeneration? Is it only exhaust temperature or speed and RPM also? I'm wondering if DPF can regenerate while car is at ...
5
votes
1answer
434 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
0answers
42 views

Additives in Engine Oil

As engine oil is been used in the engine, it gets aged and therefore oligomers are formed. Is there a way that we can separate these oligomers without affecting the additives in the oil???
5
votes
1answer
656 views

Possible EGR problem on Fiat Idea Multijet 1.3 Diesel

I've been having issues with my 56 plate Fiat Idea for a while now. It seems to drive normally up to about 2500-3000 rpm where the car lurches a little, as though i shifted down a gear, the MIL light ...
6
votes
1answer
179 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 ...
13
votes
9answers
11k views

Diesel vs Petrol motorcars. Pro's and cons?

I realize this may be a silly question to those of you on here who are proper petrol-heads and this may even be a repeat question, but I could not find anything on it on here, so here goes: What are ...
6
votes
1answer
276 views

Can diesel engine be harmed as easily as gasoline engine by over-revving?

There is an excellent Q&A about why diesel engines have lower redline RPMs (about 4500 RPM) than gasoline engines (about 6500 RPM). The reason is related to the combustion of diesel fuel. However,...
7
votes
2answers
563 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. ...
7
votes
1answer
167 views

Car can't start after rocker gasket change

I have a 2008 BMW 120d LCI with N47 engine. Recently was diagnosed with some oil leak on the rocker gasket near the injector area. Were advised to change the rocker gasket seals. So I did change the ...
8
votes
3answers
561 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 ...
6
votes
1answer
70 views

What is DEF and how is it used?

I keep hearing about DEF ... what is it and why is it used in conjunction with diesel engines? I know it is a more recent thing (last decade), but don't know much about it.
6
votes
2answers
393 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 ...
40
votes
6answers
9k 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 ...
4
votes
2answers
155 views

Diesel engine suddenly doesn't start and returns to normal without aparent reason

I have a Ford Fiesta 1.4 tdci 2003 that was working without issues since yesterday. Just stopped at house after work to eat, 2 hours later I went to the car and it wouldn't start. I tried hard but ...
1
vote
1answer
40 views

1995 Ford F-250 - Starter continues to run until the batteries are dead

Have a '95 Ford F250 with the 7.3l diesel. Starter just quit working one day. I changed the solenoid and the key lock barrel on the steering column. Now it will turn over but won't stop. Starter motor ...
0
votes
1answer
61 views

When breaking in a diesel - treat it gently or drive it?

I've been googling diesel run in, and generally encounter two opinions: The first is treat it gently for the first 1000k, and do not exceed 2,000 rpm. The second is drive it at 3/4 revs, maybe 2,500 ...
1
vote
1answer
126 views

Ford ikon 1.8 nxt diesel - Starting problem [closed]

Ford ikon 1.8 nxt diesel. It has coverd 130000 kms. Now in winter, there is starting trouble. Mostly it takes 30 to 35 secs. Long self. I have checked its heater , hetaer timer ,fuel leakage , battery ...
4
votes
1answer
24 views

Coolant type for 1977 Diesel

I have a marine 1977 Perkins T6.354 6 cyl, 6 liter turbo diesel. There are different types of coolant available and I've done significant research into this question and have not found a clear answer....
7
votes
4answers
216 views

2002 Ford F350 Superduty 7.3L Turbo diesel using a quart of oil every 43 miles

This Diesel engine has been rebuilt and it didn't use any oil till the HPOP went out. I replaced the oil pump and then I noticed my turbo when going up a hill and the Turbo would sound like a sneeze ...
4
votes
1answer
4k views

High oil pressure after oil and filter change

I recently changed the engine oil and filter in my Westerbeke diesel. I gave it the usual (and specified) 4.5 quarts of SAE 30, specifically Chevron DELO. Now when it starts up it reads 80 psi of ...
1
vote
2answers
57 views

Diesel Engine Power

Let's say we have a 6 cylinder diesel engine having 385 KW power. Now I am running this engine at high idle of 1900 rpm. What will be power produced by this engine? Is it equal to max power or less ...
2
votes
1answer
389 views

KIA Sedona 2003 Diesel Intercooler Turbo Low Fuel Mileage

I have a 2003 a Kia Sedona turbo diesel 2.9L, with intercooler. I am getting 5 km per liter of diesel consumed. I also have to do oil change and ATF replacement. I got the car 3 weeks ago. What are ...
3
votes
1answer
49 views

Does anybody know what this is?

I was admiring my grandpa's John Deere 5203 tractor today and saw this. I'm pretty sure that's the throttle connected to the spring-hinge, so I'm guessing it's some kinda fuel injection. However, I ...
8
votes
2answers
1k views

Why does a petrol engine need to maintain an air-fuel ratio, while a diesel engine doesn't?

This simple question has been bugging me for a while. The amount of fuel injected into a petrol engine is calculated according to the amount of air entering through the throttle valve (as measured by ...
3
votes
2answers
374 views

1999 diesel Ford fiesta not starting

I'm having trouble starting a 1999 ford-fiesta, diesel (EN engine), that would be mk4 of fiesta. What I tried (in that order) was: Changed fuel filter Tried starting spray (the engine seems to have ...
13
votes
5answers
32k 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?
2
votes
3answers
871 views

do diesel engines have Idle Air Control Valve?

My problem is that sometimes when my Astra G tdi 1.7 2002 is idling (is not in gear) the RPM will go to 5000-6000 with out me stepping on the gas pedal. The engine accelerates on its own while idling. ...
7
votes
3answers
2k views

Why are VW recalling their cars to remove a defeat device?

As I understand it, Volkswagen had software to artificially enhance their efficiency ratings on a test rig. Since it would only be active under test, what is the point of recalling millions of cars to ...
8
votes
0answers
85 views

1983 Mercedes Diesel - Loses Power Over Time

I picked up this car as a gift, and on day one drove it the 370+ miles home. After the first 160 miles or so I noticed that the car was struggling to maintain highway speeds. So I pulled over into a ...
4
votes
2answers
5k views

Filling diesel vehicles - Vent trick

According to this site it is possible to get more diesel fuel in your tank by pressing in the vent latch on the filler neck: Look inside the filler neck and you can see a button, see below for ...
2
votes
2answers
120 views

DPF (Diesel Particulate Filter) and Turbo: Golf TDI Bluemotion(hybrid)

I have a problem with my 2012 Golf TDI Bluemotion. The DPF and turbo need to be replaced. The replacement costs about R65 000 SA Rands. Is this common with this TDI blue motion engines or it's my ...
16
votes
5answers
4k 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 ...
5
votes
2answers
3k 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 ...
3
votes
3answers
1k views

Marine Diesel fuel filter vacuum gauge spiked — filters are new

I've got an 80-HP marine diesel engine (in a sailboat, naturally). I've got a the Parker/Racor 75500MAX dual fuel filter system with an attached vacuum gauge to monitor resistance. For the first few ...
6
votes
6answers
6k views

what can be the reason my old diesel Mercedes won't start?

The vehicle is a Mercedes-Benz T1 model 308D. The engine is an old Mercedes-Benz OM601.940 4-cylinder indirect injection 58 kW (79 hp) 2299 dm3 diesel engine from year 1992. It's not a turbodiesel! - ...
3
votes
3answers
177 views

After five years in garage diesel car wouldn't start, what should be done?

One of my friends left his car in the garage since five years back and he has lived abroad since then. He left it with a full tank(its a diesel), and it ran perfectly well back then. Now he's back and ...
0
votes
1answer
153 views

How to test injectors on a 1999 F-350 with a 7.3

How do you test injectors on a 1999 F-350 with a 7.3 motor? I think it might be misfiring.
3
votes
0answers
116 views

Hyundai Tucson died while driving; will not start

I have a Hyundai Tucson 2011 directed injected diesel which has just broken down. What happened is that while driving the engine suddenly stopped and won't start. There is no check engine light on. ...
1
vote
1answer
41 views

x3 bmw latest model has a diesel knock, opened the top one piston not reaching tdc

I have an x3 diesel latest model bought it at an auction. Now it had a heavy diesel knock sound. So I decided to open the top. When I did, I saw neither visual damage on my injectors nor the cylinder ...
2
votes
1answer
106 views

I get a blast of hot air during stop start driving. What could cause this?

I am a learner driver with a Hyundai i20. Every now and then when I stop and then go and switch to second gear I get a blast of heat at my legs and feet. The aircon is off and its a diesel. I am ...
5
votes
1answer
82 views

How much to get an old restomod running?

potentially a difficult question here. It's looking like I'm going to be moving out of state for a new job here in the next few months, which is throwing a big wrench into projects I have going on. ...
3
votes
1answer
1k views

Car won't start in the cold

everyone! I've googled about this issue, but couldn't find much info. I hope that someone could help. I have cold start issue below -10C(14F). If it just -10C it harder to star, but if temperature ...
3
votes
1answer
268 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 ...
9
votes
2answers
3k views

Modern cars and diesel warm-up time

First of all let me say that I already read this question and its answer, so it's clear to me why diesel-powered cars need a warm-up time. My question is: do modern cars need it too? I have VW Golf ...
4
votes
1answer
128 views

Octane rating of fats and oils versus diesel fuel

I'm struggling to understand why, apart from viscosity, it's so easy to substitute lipids (i.e. SVO, WVO) for diesel fuel. I'd have to assume these fuels have inherently different octane ratings and ...