rpmerf
  • Member for 6 years, 9 months
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Does stopping the engine while it is still moving/turning damage my car?
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19 votes

What will happen is dependent on the configuration of your vehicle. Automatic transmission - Due to the torque converter, the engine will just stop. This is bad for the transmission, because the ...

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Standard Practices for Use and Care of Click-Type Torque Wrenches
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16 votes

The main things I've always heard/done. Always unwind before storing. This helps to keep stress off the springs. If you leave it wound up, the springs can get weak and give inaccurate torque ...

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Can't get into trunk of 2000 mercury marquis
15 votes

Even if the seat does not fold down, you can unbolt it. Remove the bottom part first, then the back. This happened in my mother's Camry several times(bad latch mechanism) and I had to remove the ...

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What mechanical action is heel and toe (clutchless) shifting trying to accomplish?
15 votes

Heel-Toe shifting and clutchless shifting are 2 different things. I guess they can be done together.... The one thing both of these techniques have in common is rev matching. There is the RPM you ...

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Loud bang while driving, then lug nut is missing - what happened?
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13 votes

As long as the rest are tight (and torqued to spec), I would put a new nut on and torque it to spec. Given that there isn't and left over metal on the stud, like the nut stripped out, I would say it ...

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If only replacing two tires should they go on the front or back?
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12 votes

Officially, the better tires go on the rear to help prevent oversteer. If you front tires loose traction (understeer), you are going to go straight until you catch traction, or hit something. Its ...

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Why do dealers seem to prefer to replace parts instead of repairing?
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12 votes

It is typically faster, easier, and more reliable to replace a bad part with a new part. The dealership wants to the vehicle to leave the shop in the best possible condition that they can guarantee ...

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I've just been rear ended. How can I check for damage?
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12 votes

Not sure how things work were you are. Here if you are rear ended, it is considered to be the fault of the person who hit you, so their insurance will pay for the damage. If this is the case, you ...

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Mysterious "5th" Gear on a 4-Speed Automatic?
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11 votes

The transmission has a lock up torque converter. The torque converter sits between the engine and transmission. It is kind of like a clutch on a manual transmission car. When the engine is idle, it ...

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40MPG at 100MPH?
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11 votes

One of the reasons is loads of extra weight added by safety features and options. 8 airbags, 12 speaker stereo, 14 way adjustable seats, tons of insulation all around, power windows, power locks, 18 ...

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What are the various causes of preignition / detonation?
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11 votes

Most of my knowledge comes from turbo engines. Detonation or preignition is caused by the air/fuel mixture igniting before the spark plug fires. The mixture is typically ignited by a hot spot either ...

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Would not allowing my vehicle to downshift uphill be fuel efficient?
10 votes

The primary reason to down shift is more power. The 2 things effecting your gas mileage here are throttle position and RPM. As long as you can stay in 8th at less than half throttle, I would stay ...

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Should I wait for my car to be completely stopped before putting it in reverse?
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10 votes

It causes more wear on the clutch as you have to ride it a little more, but overall its fine. The syncros will likely wear a little faster also as the output shaft will be spinning in the opposite ...

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Wheel removal solutions
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10 votes

I've worked at a garage. We use a rubber mallet. Hit it like your doing lug nuts. Hit it, rotate 90*, hit it, rotate 45*, and so on so you are not always hitting on the same spot. We would ...

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Is my car battery charger not working?
9 votes

12.45 to 11.94 in 6 days seems like a significant discharge. You should be able to leave your car for a month or longer and still have enough power to start. At your current discharge rate, I wouldn'...

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Should you change a thermostat when changing your water pump
9 votes

You don't need to, but since your coolant system is already drained, it would be a good time to. Standard thermostats are only about $10 and a $2 gasket. Changing your thermostat is typically 2 ...

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2004 Subaru Forester black smoke oil not accelerating
9 votes

It sounds to me like you 'windowed the block'. When you lost oil pressure, you were at highway speed, so your engine was spinning decently fast, and every revolution without oil does more damage. I ...

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How do you plan an engine build?
9 votes

bit of a braindump... Hard to get more specific without more specific requirements... Is this a drag car, track car, street car, daily driver, etc. Basically this will lead you to - where do you ...

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BSFC (Brake Specific Fuel Consumption) - How is this a beneficial measurement?
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8 votes

Going to take a stab at this... I am not an expert, just what I've put together in my head. A lot of this gets into more general engine tuning/building. BSFC is basically how much power you output ...

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Cylinder Leak-down vs Compression Test
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8 votes

Compression test is more to test if there is a problem. If your compression is low, it could be a number of different issues. You can test the rings by adding oil to the cylinder and see if the ...

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Is WD40 a penetrant?
7 votes

http://www.jalopyjournal.com/forum/threads/best-penetrating-oil-for-stuck-nuts-bolts.773380/ There was a study done on penetrating oils. Here's the highlights - The break out torque required for: ...

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How does an ignition switch work?
7 votes

Basically, your car has several circuits: Always On - Connected directly to the battery and is not affected by the ignition switch. This includes: alarm, interior lights, brake lights, headlights, ...

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What happens if I change the oil when the engine is cold?
7 votes

Think of a cup with sediment (dirt, sand). If you shake it up real good, then dump it out, you will get most everything out. If you let it sit overnight, the dirt and sand settle to the bottom. ...

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Do Most Common Engines Have A Cylinder Head?
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7 votes

All piston engines must have a cylinder head. The head is on top of the block and forms the top of the combustion chamber. The head is also where the valves are. The valves and chambers in the head ...

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Strange overheating behaviour
7 votes

I am leaning toward the water pump. The cool radiator and heater core are a sign that the hot coolant is not being moved around. Coolant should always flow through the heater core while the ...

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Replaced busted brake line but the brakes still don't work
7 votes

I have a 97 suburban, so I believe things are very similar. I too have replaced lines on this truck and spent hours of time and over a gallon of fluid trying to get it bled correctly. A couple ...

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Why do tyres go flat after a few weeks of non-usage?
7 votes

The best way to find a slow leak is to put the tire under water and look for bubbles. Try to find a tub big enough to cover the sidewall with the tire standing up. Pump the tire up to about 35 PSI, ...

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What makes some engines more sensitive to head gasket failure?
7 votes

A few of the main things I can think of.... Higher cylinder pressures put more strain on the combustion ring. Detonation/pre-ignition/pinging, especially on high compression or forced induction ...

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97 Honda Accord won't start after head gasket replacement
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7 votes

You need Spark, Fuel, and Compression for an engine to run. Since this engine was just reassembled, there is a lot to question. Spark - rotor position - beware of caps where the points are not "...

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How to measure angle when ratcheting a bolt?
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7 votes

90° = quarter turn. 180° = half turn. It's alright if you are off a few degrees. I typically start with the breaker bar perpendicular (straight out) and do quarter turns, or have it straight off to ...

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