dotancohen
  • Member for 10 years, 5 months
  • Last seen this week
Why do heavy vehicles almost always use diesel engines?
27 votes

A major, but often overlooked, reason for the dominance of gasoline engines in passenger vehicles is the need for diesel engines in heavy vehicles. A given quantity of crude oil, depending on its ...

View answer
Will having a radiator full of engine oil do damage to the motor?
24 votes

The seller should not be selling the vehicle with oil in the cooling system. That supposed "quick fix" should have been rectified at the earliest opportunity. Have him flush the cooling system and put ...

View answer
Bump on the floor in the back of sedans
Accepted answer
10 votes

The hump provides longitudinal rigidity in the unibody. The fact that it also provides a place to route the exhaust is a bonus. Notice that modern CAD-designed vehicles have much less of an obvious ...

View answer
Will fitting a physically bigger battery reduce the working life of the alternator?
8 votes

In fact the larger capacity battery may, under certain circumstances, increase your alternator's life. Many vehicles with enhanced sound systems install a larger battery to smooth out the load spikes ...

View answer
Is it safe to use a hydraulic jack as a stand? If not, why?
8 votes

Hydraulic jack seals blow. Because hydraulic jack seals blow one should never put body parts under a load (vehicle) raised with a hydraulic jack. Let me state that again so that it sinks in: ...

View answer
Garage tech drained oil and forgot to refill. I drove off - what damage could this have caused?
6 votes

The cylinder walls can be inspected by a borescope, but the rings, main bearings, rod bearings, cam bearings, valvetrain, timing chain, and oil pump cannot be. Damage to any one of those components ...

View answer
How to verify if a oil pan needs to be replaced
5 votes

The oil pan is not a normal wear item, however being so low to the ground it is possible to damage it. As the oil pan is not removed for regular inspection, any decision made by the mechanic should be ...

View answer
What to do if your car breaks down a LONG way from home?
5 votes

Be friendly. You don't know if the locals are hostile to your religious affiliation / your gender driving a vehicle / your social status. But no matter how they approach you, remain friendly and don't ...

View answer
Is this gouge in the side of the tire a safety issue?
5 votes

That crack was caused by heat and drying out in the sun. It will run, and your should replace the tire.

View answer
Changing car locks to newer ones for security?
4 votes

With older cars, the value of the securing the vehicle is not in preventing it from being stolen, but rather preventing the contents of the vehicle from being stolen. Other than joyriding, most cars ...

View answer
Are bad winter tires still better than summer tires in winter?
4 votes

Lots of misinformation in the answers here. Old winter tires are preferable to summer tires in snowy conditions. The OP mentions "we didn’t realise how bad they are", so I conclude that the tread is ...

View answer
Are Oil Puddles in Cylinder Head Normal?
4 votes

There should never be oil on the plug, neither on the "inside part" nor the "outside part". If oil is on the "inside part" of the plug, then the problem is likely a head gasket, valve stem seals, or ...

View answer
What to look out for when buying a car that hit a deer?
3 votes

In addition to the other fine answers, you should inspect the crumple zones, which are most easily inspected by looking between the fender bolts under the hood. On most vehicles, you should see the ...

View answer
How can I disable my 2002 Ford Explorer so someone with a key can't start it?
2 votes

Don't disable the vehicle. Put up a set of dummy keys, which you can get from any junkyard with a similar-year Ford, it doesn't even have to be an Explorer. The real keys you could hide somewhere, and ...

View answer
Is a tire with exposed wire safe to drive on?
2 votes

The tire in the photograph is not safe to drive on, but that does not mean that you cannot drive the vehicle to work. If the vehicle has a full-size spare tire, then replace the worn tire with the ...

View answer
Is my automatic transmission broken?
2 votes

Take a look at the new transmission fluid. Does it have any evidence of metal in it? Is it at the proper level? Also, the sputtering and jumping when pressing on the gas sounds more engine-related ...

View answer
Good resource for 3rd-row seating safety?
2 votes

I recently went looking for information on the subject and had to address the national vehicle safety office, luckily I worked there when I was in university! The truth is that nobody has ever ...

View answer
Why one should not leave fingerprints on bulbs and plugs?
1 votes

Despite the two previous answers stating that fingerprints on spark plugs are not a problem, I'll mention that they are. I have personally replaced plug wires that showed traces of carbon where the ...

View answer
What would cause a drive shaft to snap in half?
1 votes

Usually drive shaft issues can be attributed to aftermarket engine modifications (more torque) or tires (more traction, and thus a higher peak torque through the shaft). In both those cases slight ...

View answer
Could a car left sitting for 6 years ever run again?
1 votes

Six years really isn't that long for vehicle to sit idle. I've gotten old Mustangs running that have been sitting unused for twice that time period, also with no storage preparations. The major ...

View answer
Automatic Transmission: Best practice when waiting at the red light - N or D?
1 votes

The only stress on the transmission when left in D at a full stop is the shearing stress applied to the transmission fluid in the torque converter. There is no wear of mechanical components, nor ...

View answer
Steering wheel shuffling sound when turning - Astra H
1 votes

Are you sure about the location of the sound? It might be a loose or worn power steering belt that is slipping when the power steering pump is put under load.

View answer
Why rear disk brakes do not wear the pads even?
1 votes

Check your alignment. If the car has ever been hit hard, the car might be driving down the road "sideways", that is that the back tires are not pointed straight. That will lead to uneven tire wear, ...

View answer
How to add a 7th gear to a car to enhance fuel economy?
0 votes

If your goal (as stated) is to lower engine RPM at a given speed in top gear, then there are several ways to do that without adding an extra gear shiftable to the transmission. The simplest way would ...

View answer
Timing Belt need replacing? Unknown mileage
0 votes

I'm late to answer, but I'd like to present an alternative opinion to those opinions that I see already here. Though their may be risk of damaging the motor if the belt fails (interference engine), ...

View answer