Motor Vehicle Maintenance and Repair Stack Exchange
Motor Vehicle Maintenance and Repair Stack Exchange

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1500 questions
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3 answers

What is the pin or keycode for ELM327 bluetooth OBDII adapter?

The infamous ELM327 OBDII device came without any paper, just a crappy CD with no document related to the device (only some software and drivers thrown on the CD almost randomly). I tried the following codes without being able to pair it with my HTC…
sorin
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Can I jumpstart a non-hybrid car from a hybrid or full electric car?

This morning I had starter battery troubles with my 2001 VW Eurovan. As it happened, my father-in-law arrived just at the right time in his fancy new Toyota Camry hybrid. So we opened the hoods, dug out the jumpstart cables and then got…
Digital Trauma
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What is a rod knock?

What is a rod knock? What causes a rod knock, how bad is a knocking rod, and how can I tell if a rod is knocking?
Jerreck
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Does resting your foot on the clutch wear it out?

Does driving with your foot always resting on the clutch (not pushing) generally wear it down?
George
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How is engine load determined?

I'm struggling to find information on how engine load is defined. Is it really just a fancy word for torque demand? There are three parts to this question: Is there a theoretical equation that is used to define engine load? If so, what is it? I…
Zaid
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Why does diesel engine need a warm-up before the start-up?

When starting up, diesel engine needs approximately 5s before turning the key for ignition. Why is this neccessary and what can be damaged if you don't do that?
winter
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Engine oil change and getting rid of old oil completely

After running the vehicle for a certain distance usually we will change the engine oil. This will not only give engine new life with the brand new oil but will also get sludge and other sediments out of the engine. So while changing the engine oil,…
BraveNinja
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Lugging the Engine (Manual Transmission)

So...lugging the engine obviously isn't something that is good. But why? For example when you feather a clutch to get the car moving, it lugs for a quick moment when you hit the catch point (When giving it no gas). Or at least it does in my car…
user4822
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6 answers

Engine power specification at different rpm?

Car companies advertise the power of an engine at different rpms. Car 1: 80 PS at 6000 rpm Car 2: 85 PS at 6500 rpm What does the power at different rpm mean? Does it mean Car 1 has better power than Car 2 because it's at lower rpm? Or does the rpm…
user3041058
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What is happening when a two-stroke engine is said to be "four-stroking"?

Many years ago, I was involved in a hobby of building and flying model aircraft. The aircraft used alcohol-fueled 2-stroke engines with glow plug ignitions. When these engines ran rich (and always at idle), they produced a distinctively different…
Anthony X
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Have I damaged my car by attempting to reverse with hand/park brake up?

Earlier today, I stopped a little too far from an entrance I meant to use. I had to reverse to get back to it. I unconsciously pulled the handbrake up when I stopped (I think it is habit) so when I put the car in reverse, it refused to move. The…
MoKa
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Why do cars have plastic shrouds over the engine?

My 2005 Subaru Outback (3.0 flat 6) has a plastic cover under the hood which covers the engine. Or it had -- I had some work done and the mechanic has given the car back to me without the shroud. What is the point of these shrouds? Should I ask for…
tgdavies
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Adding a additional battery to car

I have purchased a brand new Toyota Innova. I need to install a a mac mini, 2 laptops and make this car a mobile office. I need to know if I can install another car battery in parallel, and will there be any negative side effects ? I know that a…
Siddharth
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Can I connect wires by just twisting them together and insulating with tape?

My cousin replaced a instrument panel cluster of a car with another one that is very similar. He did it by cutting the original junction/wires block that come out of the instrument panel and attached the junction block/wires of the new cluster to…
Diego Alves
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Why do car starter motors draw so much current?

I understand that most car starter motors' power is rated between 0.5kw to 1.5kw. Doesn't that mean that they are supposed to draw 40-120 amps? (500 w / 12 volts etc.. )? Yet when they start, they draw hundreads of amps for the split second they…
Andrei Grigore
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