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29 votes

Small amount of wrong fuel type put in the tank

The main concern with using petrol in diesel systems is that diesel is used to lubricate the fuel pump, which petrol cannot perform adequately, which will shorten the useful life of the fuel system. ...
Zaid's user avatar
  • 39.2k
29 votes

What happened to my car?

Being a diesel and that the engine ran for a minute with the ignition turned off, makes it highly likely that you experienced diesel runaway. During normal operation, diesel is used as fuel for the ...
HandyHowie's user avatar
  • 25.4k
16 votes
Accepted

Small amount of wrong fuel type put in the tank

The main problems from misfueling a diesel car with petrol stem from the fact that (as Zaid points out) petrol doesn't provide the lubrication effect of diesel fuel and as a solvent it can actually ...
motosubatsu's user avatar
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13 votes
Accepted

Is it possible for a diesel engine computer to detect (and prevent) a runaway condition?

The common way that effective overspeed protection is provided on diesels in the oil and gas industry is way more simple than using electronics to effect a shut down. The only effective and reliable ...
Jimmy Fix-it's user avatar
13 votes
Accepted

Is it safe to transport diesel fuel in a plastic can inside of a plastic tub? Or store it in the same way?

Fuel cans contains carbon in the plastic. This is a large part of why traditional fuel canisters are black. This dissipates static charges by bringing the plastic from perfect insulator to the megaohm ...
vidarlo's user avatar
  • 764
12 votes
Accepted

Scraping sound in new small engine

I actually decided to go ahead and just tear into it no matter the answer and can make the following statements: Bore and piston rings were absolutely immaculate and there was no scraping whatsoever ...
Yanick Salzmann's user avatar
11 votes

Small amount of wrong fuel type put in the tank

This will not be a problem - in fact, some of the older truckers used to add 2% of petrol to the diesel to help in winter conditions to help reduce waxing of the diesel fuel.
Solar Mike's user avatar
  • 34.6k
11 votes

ATF in engine oops

I would run the engine again for a few minutes and then drain that engine oil as it will have any ATF that was still in the galleries. Then fit a new filter and refill with fresh oil. After that you ...
Solar Mike's user avatar
  • 34.6k
11 votes

VW Polo Engine Oil Light Blinking on hill

I have a VW TDI diesel, but an earlier model. Your oil light comes on when there is a gradient but not because of a gradient. A mechanic who blames the tilt of the ground for the light on the dash ...
MTA's user avatar
  • 6,609
10 votes
Accepted

What would cause a short to ground while driving - how to locate the problem?

The most likely cause is that the cable that runs down to the starter motor has been rubbing against the body or the engine and has worn through the insulation.
HandyHowie's user avatar
  • 25.4k
9 votes
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Diesel engine timing?

Diesel engine timing is accomplished through the fuel injectors (they inject fuel at the proper times). Proper timing prevents pre-ignition because there's no fuel in the cylinder yet to ignite. Glow ...
Jason C's user avatar
  • 4,890
9 votes

Why does "i" stand for petrol?

It stands for Injection as in Fuel Injection.
method's user avatar
  • 2,770
9 votes
Accepted

Why does "i" stand for petrol?

The i is a leftover from the 1970s, when a few companies (BMW and Mercedes, notably) started replacing the carburetor on their petrol engines with fuel injection. The marketing department saw an ...
Hobbes's user avatar
  • 4,412
8 votes

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

Short answer - no. It's perfectly okay. And , it's also perfectly okay to be annoyed. It's one of those things mechanics like to do (no offence to anyone). Similar to endlessly hitting refresh on a ...
chilljeet's user avatar
  • 2,196
8 votes

What preparations to make before changing oil on old neglected tractor diesel engine

The engine in your tractor should hold are 6.5 quarts (6.2L) of 15W-40 oil. That amount should fit in most oil collection pans. If you want to use kitty litter as oil clean up, that's a great idea. I'...
Pᴀᴜʟsᴛᴇʀ2's user avatar
7 votes

How are diesel engines better for the environment than gasoline?

Locally worse, globally better Diesel exhaust versus gasoline: about 15-20 % less CO2 about 4-100 times the NOx (highly temperature dependent, mitigated by proper use of diesel exhaust fluid, ref ...
user2394284's user avatar
7 votes

What would cause a short to ground while driving - how to locate the problem?

Sounds like a dead short, one large enough like that should be easily visible, either through burn marks on a metal edge or bracket or a hole in the insulation. Check and follow all the main or thick ...
Solar Mike's user avatar
  • 34.6k
6 votes

1983 Mercedes Diesel - Loses Power Over Time

Drop the fuel tank and inspect the contents, looking for jellyfish, fluff, water, dirt, and the bones of lizards... Paulster2's initial comment was spot on. Although I doubt it is a single "...
SteveRacer's user avatar
  • 12.4k
6 votes

How did they start diesel engines before the glow plug was invented?

When I was little, my dad had a yacht which had been a northern European coastguard patrol vessel. He bought it as surplus military and converted it into a yacht. The engine, a Stork Werkspoor diesel, ...
Sjoerd Koppert's user avatar
6 votes

Is it possible for a diesel engine computer to detect (and prevent) a runaway condition?

It would presumably be very easy to detect a runaway condition based on throttle position, engine speed and possibly rate of acceleration or overspeed RPM. Shutting the fuel off won't help because ...
Steve Matthews's user avatar
6 votes

Is it possible to have glow plugs on all the time for certain amount of time?

The way the VW (so assuming Audi is similar) glow plugs are controlled on the TDI Jettas of similar vintage, the plugs should come on (what VW calls "pre-glow") whenever the block is cold. You should ...
dlu's user avatar
  • 14.5k
5 votes

What are the pro's and con's of compression braking vs. exhaust braking?

Attributes of Exhaust (Jake brake) and Compression Brakes Compression (Jake) Brake Jake brakes slow a vehicle by releasing pressure Jake brakes are operated at the valve train. Jake brakes open the ...
DucatiKiller's user avatar
  • 32.9k
5 votes

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

Paulster2 is right, varying the injection timing with respect to the engine crank angle timing is the main way to control the combustion process in a diesel engine. In a conventional gasoline engine (...
Renlin's user avatar
  • 51
5 votes

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

A very high compression leads to self-ignition of the fuel-air mix. In the case of the Diesel engine this self-ignition is desired and part of the concept. In the case of the Gasoline engine self-...
Martin's user avatar
  • 8,458
5 votes

Turbo Failure Modes (VW TDI VNT15)

Is there any way that the vane actuator could be moving and yet not actually moving the vanes, or is it a positive linkage? There is a positive linkage, but it doesn't mean it isn't working right. ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
Accepted

Car suggests shifting gears too early

It is suggesting shifting up early as "it is tuned for economy" - it is not trying to get you to speed quickly. It is trying to be economic with fuel. If you follow the guidance on the dash (remember ...
Rory Alsop's user avatar
  • 18.6k
5 votes

Diesel runaway - stopped miraculously by itself

Regarding loss of compression The loss of compression can be explained by the evidence of oil in the cooling system. The usual way the two fluids mix is when there is head gasket failure and/or ...
Zaid's user avatar
  • 39.2k
5 votes

Diesel runaway - stopped miraculously by itself

I'm not familiar with your engine, but on the VW TDI engines quite a bit of oil can accumulate in the intake, particularly in the intercooler. The last time I did the timing belt I found about 100 CC ...
dlu's user avatar
  • 14.5k
5 votes
Accepted

How do I safely fill and use an external diesel can?

That's a lot of questions! Still, let's see… If I use this container correctly, am I still incurring significant risks that are hard to control? Define "significant" and "hard to ...
Peter Duniho's user avatar
5 votes

can i use api CJ-4/SN in a gasoline car?

Your annual temperature range is -10C to 35C. The oil viscosity of 15W-40 means that the oil is no thicker than straight SAE 15 oil at winter temperatures and no thinner than SAE 40 weight oil at 100C....
MTA's user avatar
  • 6,609

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