Internal Combustion Engine. Most engines in road going vehicles are 4-cycle internal combustion gasoline engines.

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5
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2answers
2k views

Should we wait a few seconds before starting the engine?

My cousin told me when he enter his car, he put the key to ignition then count to 3 and start the engine. The main raison of him doing that is to give enought time to fluids (I'm not sure which one) ...
3
votes
0answers
26 views

1999 Ford F250 XLT Super Duty – Oil in coolant

My truck has the 6.8l V10 Triton engine in it. When I got it there was a lot of oil in the cooling system but no water in the oil. It ran hot once but didn't do it again. Would it be the head gasket ...
4
votes
1answer
9 views

Engine noise and smoke while driving with low oil, no longer starts

I have a 1971 Ford F250 XLT. I was driving it down the highway and I realized I needed oil badly. I told my wife "we gotta get oil first thing tomorrow" and she said okay. 5 minutes later, 10 minutes ...
14
votes
4answers
4k views

What actually happens when there is way too much oil in a car engine?

I saw the answers to a question I posted recently highlighting the disadvantages of having too little oil in an engine, but that got me wondering what if the complete opposite were to occur! I know ...
35
votes
9answers
83k views

What actually happens when there is not enough oil in a car engine?

When a car is topped up with oil, it clear to most people that you are supposed to fill it to the recommended amount as specified by the manufacturer (normally on a dip stick). What exactly are all ...
2
votes
1answer
18 views

Activa engine noise

My neighbor and I purchased an Activa 3g at the same time. When my bike is in idle (just after immediate start) as well in running condition, it sounds little bigger/ rough noisy like dub dub... Also, ...
21
votes
7answers
92k views

What are the risks of overfilling a small engine with oil?

I recently overfilled a 4 stroke lawnmower engine with oil. It has been run for about 1.5 hours while overfilled. It smokes a lot right after being started but after 30 seconds or so the smoke clears. ...
11
votes
4answers
4k views

What happens if unsuitable oil is used in a vehicle engine?

I recently heard an urban legend-like story about a guy in a developing country who decided engine oil was too expensive and so used some vegetable oil instead. The story says the car ran for some ...
5
votes
0answers
13 views

04 GMC Savanna G2500 4.8 V8 No Power

First time I looked at this the A/C compressor clutch wasn't engaging. Long story short: the high side pressure switch on the back of the compressor was unplugged. Noted that the engine was shaking (...
12
votes
3answers
369 views

Diesel Engine Runaway - What is it?

I was watching some youtube videos and diesel engine runaway videos started to pop up where apparently the diesel engine runs out of control until it destroys itself. My Question What is diesel ...
7
votes
5answers
362 views

What can cause a gasoline engine to suddenly & mysteriously stop (non-catastrophically)

I was thinking about this question and found myself wondering what could cause a gasoline engine to suddenly stop, and then be restartable? So not things like running out of fuel, or suffering a ...
7
votes
3answers
2k views

Infamous WRX/XT overheating problem

I need some help figuring out what's wrong with my 2007 Forester XT Manual. Background: The headgasket popped in November of last year. I had it fixed by an RMI certified workshop. They skimmed the ...
5
votes
0answers
22 views

Accidentally poured gas into antifreeze in tractor

I was gonna fill our tractor with gas and there were to caps, a metal one a d a filter looking one, neither was labeled so I figured the metal cap was the gas cap, I put gas in it for just a few ...
4
votes
2answers
24 views

Grind/Crunch Sound Near Alternator (video)

1983 Chevy 305 small block. Hearing a grinding sound near the alternator. Is this a bearing or something grinding near the belt ? Not exactly sure how to diagnose. Video: https://www.youtube.com/...
3
votes
2answers
26 views

Ticking noise on acceleration & idle?

I have an '86 jeep comanche with over 380000 mls that has started to tick on acceleration and through gears. Also at idle. Have changed motor mounts, transmission mounts, track bar, rear differential ...
4
votes
3answers
22 views

Engine Braking Force

I've got a few questions regarding the force of a typical engine brake: 1.Which parts of my car influence its numerical value? 2.Is there a formula, which enables me to predict the numerical value, ...
20
votes
2answers
2k views

Why do we need to cool air after it leaves a turbocharger?

When we are using a turbocharger to compress the incoming air, the air gets hotter. Usually this hot air is cooled by using intercooler before it is passed to the engine. But what is the reason ...
18
votes
5answers
1k views

What is regenerative braking and why don't we use it?

I know that many electric cars use regenerative braking to enable the car to become more efficient by converting what would otherwise be lost heat energy in to a more useful, reusable form of energy. ...
5
votes
2answers
34 views

Ignition timing of 4 stroke two wheeler

Gentlemen, So I work in this lab with a small dyno for a two wheeler engine hooked onto it. The engine hasn't been used for years and I had to correct few things in the wiring. I had to remove the ...
10
votes
3answers
150 views

350z cranks won't start

2003 350z cranks but won't start VQ35DE Here is my short history: Flywheel and clutch installed 1 month ago =Car worked fine +Cranksensor was added =Car worked fine -Car started to shut off while ...
25
votes
10answers
7k views

Spark plug broke off in engine - can I drive the car?

I own a 2004 Volvo XC90 T6 2.9L AWD with 6 cyl. (Twin turbo, with catalytic converter.) While changing the spark plugs, one broke-off (all the ceramic below the threads and possibly the metal finger ...
17
votes
5answers
2k views

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

I have always changed the oil in my vehicles with the engine hot, because the manuals always say to let the engine reach normal operating temperature first. Oil change instructions all over the ...
8
votes
3answers
1k views

Is it right to say that VTEC is solely by Honda?

I have an i-VTEC engine, which Honda claims to be a better and computerized version of their famous VTEC Engine. Now I am wondering: Is it right to tell people that only HONDA has VTEC? or is this ...
12
votes
2answers
216 views

Car stalls/dies suddenly while driving and is not starting again

I own a Indian Make TATA INDICA Ev2 (CR4) Turbo Engine car. I did rebore recently and the mileage was 130,000 KMs. After rebore first service of 3000 km is successfully completed and now I'm facing a ...
3
votes
1answer
43 views

Nissan Altima catalytic converter ruined twice in one month

My 2005 4-cylinder 2.5s Nissan Altima has been having major issues for the past several months. My mechanic replaced the catalytic converter and a month later another mechanic said that the catalytic ...
3
votes
1answer
2k views

Maintenance on a 2005 Nissan Sentra 1.8S

My previous car was totalled and while shopping for used cars, I have found a 2005 Nissan Sentra 1.8S on sale for a very good price. It is being sold by the current owner, and it has been going to the ...
4
votes
2answers
67 views

Safely washing engine bay of Ford Focus

I am trying to clean the engine bay of my 2002 Ford Focus SE, which is really grimy thanks to years of neglect, and a valve cover gasket leak that I recently fixed. I have been reading about how to ...
7
votes
1answer
673 views

When I remove a spark plug is it bad news if dirt or grime falls into the engine

Despite my best effort to clean up a corroded spark plug and blowing the area with compressed air before removing would it be bad news if dirt or grime falls into the engine in the process of removing ...
5
votes
2answers
37 views

Starter Motor Intermittently will not engage

2003 Kia Pregio Diesel Van just purchased 1 week ago. Owner claimed no problems. Just did an oil change. Yesterday when I turned the key to start, the starter motor did not engage. No sound, I just ...
5
votes
2answers
38 views

04 Mercury Montery stalling while driving

While driving on the highway my van stalled. Once on the side of the road, I tried to restart and no joy. All indicators and lights came on but when I turned the key nothing happened. I jiggled he ...
19
votes
2answers
11k views

Why doesn't the engine stall out when you come to a stop with an automatic transmission?

When you come to a stop with a manual transmission you have to push the clutch in or take it out of gear to keep the engine from stalling out. What keeps the engine from stalling in an automatic ...
3
votes
2answers
88k views

Rough Acceleration & ticking noise

Vehicle: 2000 Blazer 4WD Automatic 260,000+ miles (Runs perfectly if not for something going wrong every two weeks) Symptoms: Engine sounds rough when accelerating When accelerating there's a ...
0
votes
1answer
26 views

Where do you go to find illustrations of car parts?

I am trying to learn more about car engines but for the life if me can't find good illustrations of how some of them look (specifically a 2013 Nissan Juke) where do you go to get information and ...
3
votes
1answer
47 views

Engine surges when depress accelerator past a certain point

I have a 2003 manual Nissan Almera S petrol 1.5L with only 75,000 miles on the clock. Today the engine has started to surge. If I depress the accelerator pedal more than approx. ½ inch - 1 inch, the ...
4
votes
2answers
71 views

Engine tap/knock/noise after a few seconds of starting

1998 I6 - 4.0L All stock ~175,300 mi 13.8 mpg - mostly city A few months ago, I began to hear a noise that sounds similar to a diesel engine, which begins a few seconds after starting the cold ...
10
votes
2answers
76 views

Coolant Flange - What is it really called?

My antifeeeze keeps leaking out and I was told that I had a hole in my coolant flange, so when I was calling to see how much it would be to get fixed no one knew what I was talking about. I am a woman ...
3
votes
0answers
15 views

Yamaha F40F outboard boat engine continuous alarm when starting

I'm trying to start a very new 2014 Yamaha F40F engine on my dad's boat. The engine was used yesterday by my brother without issues but today it won't start at all, and I get a continuous alarm sound ...
3
votes
0answers
13 views

Royal enfiled classic 350 sounds like tak-tak while riding?

I bought classic 350 about 8 months ago but since after only first 15 days of riding i started noticing tak-tak like noise from nearby engine. Noise can only be heard while riding on low rpm when i ...
7
votes
1answer
89 views

What is the cause of this strange engine noise and white smoke from the engine?

My car has a problem the engine whistles (Hard to better describe it) white smoke comes out of the engine beneath the fuel filter Two different mechanics could not understand what's happening I ...
1
vote
2answers
34 views

Fiat uno mia 1.1

I am trying to set the distributor on my uno , the mark i made prior to removing it does not line up anymore and I am not able to turn the camshaft for some reason, I tried turning the motor by hand ...
8
votes
3answers
53 views

Preventing debris from falling in engine while changing valve cover gasket

I am about to change the valve cover gasket on a 2002 Ford Focus SE Wagon with the DOHC Zetec engine. I have never done this kind of thing before, and although it seems simple, I am concerned after ...
6
votes
1answer
44 views

How to leak down test a cold engine?

I'm thinking of doing a leakdown test on an engine before I install it in my car. Of course the problem is that the engine will be cold and things won't seal the way they do when they are hot. So how ...
7
votes
1answer
48 views

Longer crank time

Today I noticed something strange with my car. I was at a gym studio when I turned the key and I noticed it took a few "er er"'s longer before it started. As anxious I am about my expensive toys, I ...
1
vote
0answers
22 views

Jeep Wrangler Sahara (86,600kms mileage)-Oil change

Is it okay to mix Mopar 5W-20 with 1.5 liter of Total Quartz 5W-40? Driving in the middleast
7
votes
3answers
594 views

Okay to add new oil to old?

Title pretty much explains, I change my oil every 4-6k miles depending on how generous I’m feeling, however will the oil dirty oil that’s already in the sump mix with the clean oil when topping up? ...
4
votes
1answer
44 views

What are all the holes on an engine block deck surface?

I want to know what are all the holes for on a engine block deck surface? I Know some are to help with putting the cylinder head on and others are to bolt the head down. But what are the rest?
7
votes
1answer
151 views

Overheat, coolant loss, P0170/P0117, hard start, smoke, delayed throttle, no vtec

So I'm on the road right now (or was, when I wrote this) having an issue that started a few days ago and I'm trying to diagnose it. I am not sure what info is relevant, it does feel like more than one ...
4
votes
1answer
648 views

Meaning of dashboard “Check Engine Light” on motorbike

Please help me understand the meaning of this dashboard light shown in the picture. ABOUT BIKE SPECIFICATION What happen if it blinks RED ?
3
votes
1answer
60 views

What is causing my starter to arc?

I put a new solenoid in and went to start the motor. The starter ran continuously with the key off. I overrode the solenoid and tried hooking the ground to the engine, and I touching the positive ...