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Questions about vehicle engines. Most engines in road-going vehicles are 4-stroke internal-combustion gasoline or diesel engines.

-1 votes

Cleaning pistons / cylinders with cylinder block still in car

On a warm engine, allow it to soak for ten minutes. … Run the engine hard and maintain 3,200 RPM for at least 20 minutes. …
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4 votes

Oil leak on engine top

Shine it all over the engine and see what it looks like, noting what is reflective and what is not. Purchase some automotive dye and pour it into your crankcase through the oil fill neck. … Check the engine again with the black light. You should see a little fresh oil with the dye coming from the location of your leak. If not, keep checking every few days of driving. …
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  • 2,200
1 vote

What could cause high HC and CO, but low NO and CO2 in a smog test

The most likely culprits are clogged fuel injectors, carbonized intake & exhaust valves. The best solution is 1 oz. Marvel Mystery Oil (MMO) for every gallon in the gas tank, and a fresh oil change w …
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-1 votes

When is an engine flush a good idea?

I just did an engine flush with 20 percent Marvel Mystery Oil in my crankcase with fresh Mobil 1. …
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0 votes

Misfire at idle

Given that the engine is rebuilt, with such low miles, I'd start with the compression test. …
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2 votes

Can I use high temp RTV instead of a gasket?

Extended warranties, engine sensors and new component materials such as aluminum, bi-metal alloys and high-tech plastics, have created the need for superior RTV silicone gasket makers in both OEM production …
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  • 2,200
1 vote
Accepted

Vibration when lugging

The engine shakes when lugging because it is approaching a stall. The pistons firing downward don't have enough torque to drive other pistons upward. …
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0 votes

Engine Vibration 2007 Honda Accord

With the engine running and the a/c on, spray throttle body cleaner through the port just in front of the throttle body shutter, in short spurts, for five minutes. Replace the air filter. … Rev the engine in neutral at stop lights with quick pumps to the floor. On an open highway, floor the pedal on a hot day, 50 - 80 MPH, at least five times. …
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0 votes

Smoke from engine, cranks but wont start

The alternator must be tested. The melted tape suggests a short circuit, which likely fried the alternator. Check for exposed/corroded/damaged wires that could be the root cause of the short circuit …
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1 vote

Ecoboost 3.5L Twin-Turbo reliability

Towing two tons with a 4,900 lbs. vehicle? You are asking for big trouble. I don't care what the "rated" towing capacity is. Witness, for example, the recent death of the daughter of Hank Williams, …
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-1 votes

Engine coolant hot, but oil temperature normal

The hot warning light will quickly warp and permanently damage an engine. I've read that about 15% of an engine's heat is dissipated through the oil & pan. … It's important, but it affects mostly the lower parts of the engine. The sensitive, upper parts of the head are not nearly cooled as much by oil. …
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1 vote

Mazda 626 99 overheating when on and not moving

The water pump's impeller fins are corroded and worn down. Blockages in the radiator. Feel the surface of the radiator for cold spots.
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1 vote

my car can't climb even a small ramp

The results will tell you definitively if the engine block needs to be replaced. … This issue seems to pertain to the 2az-fe engine. Again, a compression check will tell if you have this problem. …
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1 vote

70mph in 2nd gear in automatic trans. Honda pilot

If there were any real damage, you would know right away. Listen carefully for any unusual whirring sounds, hard shifting, etc. during normal usage. You might consider having the transmission fluid c …
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1 vote

Did I break my PCV system housing?

You can only be absolutely certain you broke it by reading the car's computer with sophisticated equipment when it's beyond threshold level. You can be reasonably certain, however, just by the rough …
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