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

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Engine revs up when braking

Background: 2012 Honda Civic EX, 5-speed automatic, with no mods except a non-stock tire (ran over a large bolt). I keep it maintained per the manufacturer's manual and always see the Honda dealership that sold it to me new for maintenance. 20k…
allquixotic
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Turbo losing boost at around 4000 rpm

I have a 2005 Opel Astra Turbo Coupe. I would imagine most of you guys are more familiar with the Vauxhall or Holden badge, but it's the same car with the same Z20LET Turbo Ecotec engine. Anyways, when driving, the turbo kicks in at 2500 rpm, as…
Captain Kenpachi
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Motorcycle's electrical system and starter work after sitting for years, but engine won't run

I have an 1981 Honda CB750 bike that's been sitting in a garage in Arizona for 5 years. So far I've changed the battery and found all electrical components to be working. The engine isn't seized and the bike cranks, but won't start up. I've worked…
John smith
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Does idle RPM increase when there is heavy load on the electrical system?

I am thinking about installing a 500w halogen (HDX brand) on the roll bar in my jeep as the dome light because often I work in the back when it is dark or when I would like more light. The 500w light will be drawing about 40amps from my car's…
Sponge Bob
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Why is my exhaust pipe so rusty?

I think all cars exhaust pipes get very rusty after not very long. Why is that? I know that the pipe gets extremely hot, but how come that makes it rust more than any other part of the car?
Sponge Bob
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Why aren’t drive chains completely taut?

I don’t understand why roller drive chains in motorcycles have some degree of slack (around 1 inch movement) in them? What’s wrong with having a completely taut chain with no slack? Also, does the amount of slack in the chain affect transmission…
RedHelmet
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How might I fix a dent in a Honda Rebel fuel tank?

In a silly move during an engine overhaul, I dropped my Honda Rebel's fuel tank and put a dent in the top side. Is it possible to pull this dent out? I've heard there is a method using heat and ice to cause the metal to contract back into its…
BrMcMullin
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Rough idle only under load

I'm going to describe the symptoms with a very short history, some preliminary theories ( based on past work I've done on this car ), the data I've gathered and what, if any, conclusions I might draw from that data. The car is a 98 Mazda 626 GF 2L…
Robert S. Barnes
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Do I need to go to a dealer for a simple maintenance?

I just bought a 2012 CRV. Now, it's time for an oil change. I already moved so the dealer is too far away from my house (may need half day off) and there is no other public transportation to go there. My guess is the cost is about the same or more…
Richard Sayakanit
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How do I handle scarring on a cylinder head?

A few weeks ago, my Rebel 250 blew a piston, allowing the piston rod to beat on the top of the cylinder and the valves. There's some scarring there now, as well as a jagged protrusion or two. What are my options for repairing this scarring? Can I…
BrMcMullin
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Can electric cars do *dynamic* (heat waste) braking?

Imagine you drove your (pure) electric car to a very high mountain resort. It took 3 full battery charges to get up here, but by golly, you did it. And you plugged in, so battery is topped up now. Due to your altitude, your car also has a lot of…
Harper - Reinstate Monica
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Low power, bad gas mileage, smelly exhaust after engine work

My 92 Civic has had low power (need to use at least one gear lower than usual to get the same power) and has been getting bad gas mileage (15-25mpg vs 32-42 mpg usual) since I replaced the head gasket. Exhaust also smells bad. Engine is otherwise…
R.. GitHub STOP HELPING ICE
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How to save fuel on downhill slopes on a motorcycle: clutch or neutral?

I have a two wheeler i.e. bike (Honda company, four stroke) which has four gear. While driving my bike, when I come to downhill slopes, I shift the motorcycle to neutral to save the fuel. (The slopes are not very long, so I cant turn off engine…
Shirish Herwade
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Oil in air intake: is this a faulty breather valve or by design?

I noticed the other day that a component (breather valve) was not fitted properly (the clip that held the valve cover breather in place was sitting between the O-ring and the lip, instead of fastening the component to the top of the engine) and…
sebf
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What Could Cause a Sudden Loud Noise When Driving on Highway?

1990 Toyota 4Runner, V6, automatic transmission, 2 or 4 wheel drive (which I always keep in 2WD). I've owned the car for about two months, the previous owner, whom I know and trust, drove this car for a year without any major troubles. Update…
Sam Skuce
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