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1500 questions
10
votes
3 answers
Car Battery Dying Overnight - Disconnected
I have been having trouble starting my car (needed to jump it twice, once in the morning, and once in the afternoon). Sometimes it would make a clicking noise when trying to start or it would be silent. Using a multimeter I checked the following…
easycheese
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5 answers
Can I use a 15lbs torque wrench for 13lbs spark plug job
My civic has 100,250 miles and the service came up for the spark plugs. B124, I am reading and it says after replacing the plugs to torque it to 13 Lbs. The only torque wrench I have is minimum 15 LBS. Would this be too much torque? What are the…
RobNav
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votes
2 answers
Why does a catalytic converter have to connect to the engine electronically?
Recently I had to get the catalytic converter in my automobile replaced because it was stolen. The repair shop said that to do it properly, and have the engine light go off, they have to use a more expensive catalytic converter.
Why are cars…
William
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10
votes
4 answers
What to do when the wireless key fob battery dies on a 2005 Hyundai Elantra
I have a 2005 Hyundai Elantra. This morning the battery on my wireless key fob died, so I'm unable to use it to unlock the car. From past experience, I know that unlocking the car using the physical key will set off the alarm.
How can I turn…
GamerJosh
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10
votes
2 answers
Cleanly drill firewall
I recently drilled a 1/2in hole in the sheet metal on the inside of a door panel, and the result was less of a hole and more of an ugly, asymmetrical gash as the metal deformed under the stress of the drill. I had to use cutters to cleanup metal…
user2647513
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10
votes
1 answer
Why would a mechanic crank heater to maximum
This is a curiosity question. I recently had the timing belt, tensioner and water pump replaced on my Honda Odyssey.
When I picked up the van it was really hot inside but I didn't think much of it. Later I turned on the climate control and noticed…
Cameron Roberts
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10
votes
5 answers
What are the problems in building 2 stroke engines with a large displacement?
I understand (from preliminary research) that when engine gets bigger, with a higher displacement that it is practically not possible to have a two stroke engine.
What are the implications in building a higher cc two stroke engines?
BraveNinja
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10
votes
3 answers
What is the term for describing the maximum ramp inclination that a vehicle can clear?
Ground Clearance is used to describe the maximum height of an obstacle the automobile can driver over without scratching the underneath (Figure below).
Another problem with cars is that they may not be able clear a ramp if the ramp has too much…
Kang Min Yoo
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10
votes
3 answers
Change in exhaust note after extreme backfires--what did I break?
I had quite a morning with my 1986 BMW K75 this weekend. The plan was to ride the bike to a friends house to store it for the winter. The weather was pretty cold on this particular morning, perhaps 15*F (-9*C), and the bike refused to start, the…
mac
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10
votes
3 answers
Mass Air Flow Expected Values
I have a 2002 Audi A4 Quattro 3.0. I have a Vagcom USB cable and I am trying to diagnose the MAF sensor. I had a friend get some readings from an OBD2 scanner, which indicated that both precat O2 sensors (passenger side and driver side) had negative…
SSH This
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10
votes
2 answers
What is the most cost-efficient solution when door keys do not fit ignition?
I know similar questions have been asked but I'm specifically looking for the most cost efficient way to solve the following problem. I have a 2006 Lexus RX400h for which the physical door key does not fit the lock cylinder of the door (but it does…
Carnoob
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10
votes
1 answer
Battery drops to 10.5 volts after charging
A few days ago, my 97 Corolla had trouble starting. It cranks but doesn't start, maybe due to a problem with the carburetor. Figured I might discharge the battery, so I stopped my attempts at starting. Fast forward to this morning, I tried to start…
demiglace
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10
votes
2 answers
Ferrari 3.0L V8 - muffler positioning, and x-flow for specific sound
I am re-designing a Ferrari exhaust system with 2 objectives:
1: enhance the specific high pitch raspy sound that you expect from a small Ferrari V8.
2: achieve a good free-flow design.
There is approx 1.5m of tubing between the header and the tail…
Digital Lightcraft
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10
votes
9 answers
Why is it that when supercharging, it's preferred to compress the input, rather than pull a vacuum on the exhaust?
It's a strange dilemma, but if the power of an engine is determined by the difference in pressure between the combustion chamber and the exhaust, it should follow that turbocharging should be equally effective pumping air out the exhaust, than in…
tuskiomi
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10
votes
2 answers
No electrical to the dashboard after attempting jumpstart with Schumacher charger
Tried to jumpstart my car. It didn't start. Now afterward the car is in worse shape, there are no lights in the dash anymore when I turn the key, regardless of attempt to jumpstart. Hazard lights still work. No other electrical seems to be…
rogerdpack
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