General internal combustion engine questions.

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5
votes
4answers
6k views

What is the purpose of plastic engine covers?

I have a 2010 Toyota Corolla. What is the purpose of the large plastic cover that stretches over my valve cover? Does it have a particular function? Are they just for looks? Or are they designed by ...
2
votes
3answers
96 views

How to identify parts needed for a repair?

Here's a general question: How do you identify, in advance, what parts will be necessary for a repair (including all the various fasteners, o-rings, etc), and order them? Certainly for simple ...
1
vote
1answer
47 views

Which operations are done when key is turn to On position?

I would like to know which operations or functions do the car when I turn de key to On position (the key positions before start the engine) in gas engine and in diesel engine. For example, in a ...
3
votes
3answers
128 views

do all quattros have shafts connecting front and rear axles

I have recently purchased a 2009 Audi A5 Quattro, and in looking underneath the car there does seem to be a place for a shaft to connect the front axle to the rear axle (which you would expect) but ...
3
votes
2answers
126 views

Seized engine on 13 yo Infiniti, out to pasture for 1 yr. Donate for scrap or worth a revisit?

We live in the temperate Northern California foothills, and lo these many months ago, my wife took my father's 2001 Infinity up the Reno mountain pass without seeing (or checking) the dangerously low ...
1
vote
1answer
183 views

Hyundai Tucson Diesel 2.0 2008 - Difficulty Starting

Hyundai Tucson Diesel 2.0 2008 and takes at least 4-5 attempts to start before it idles badly for about 10 seconds and then is fine. Doesn't die at the traffic lights, no problems at all otherwise. ...
2
votes
2answers
787 views

What is that knocking sound my engine makes when the revs drop too low?

I have a 2013 Subaru Impreza with a 2.0 liter engine and a manual transmission, and when I let out the clutch too fast while in reverse or 1st, sometimes the engine RPM will drop so low that it makes ...
4
votes
1answer
869 views

High pitch whistle at a very particular throttle level

The symptom: while accelerating, at a very particular throttle level/pedal angle my engine recently started whistling in a very high pitch. If I let go of the gas or push it in more the sound goes ...
2
votes
2answers
610 views

Squeaking under the hood only while throttle is pressed

My 2001 F150 with 255xxx miles has a squeaking under the hood. It is only present while the throttle is pressed while driving. It is loud enough to be heard in the cab, but not over the radio. It ...
2
votes
4answers
3k views

What modifications need to be made to an engine to enable higher safe RPMs?

I first had this question while playing a racing game - it was a touring race with BMW 320i's, and I noticed that I could rev up to 8,500 RPM before shifting gears. Now my car (an older 320i), ...
2
votes
1answer
548 views

2003 Honda Civic 1.7 vTec - White Smoke from the tailpipe

I have a Honda Civic 2003 gx 1.7 liter vTec stick shift 4 cylinder. Just today I had to put oil in my car. Drove for about 5 minutes got to a light and when I shifted into first gear a white cloud of ...
6
votes
2answers
2k views

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 ...
21
votes
8answers
23k views

Is it necessary to 'burn in' or 'break in' a new car?

I've just bough a new 2011 plate car. I've heard stories of people 'burning in' engines for the first few hundred or couple thousand miles using methods such as: Not driving above 50 mph. Varying ...
1
vote
1answer
88 views

1981 amc concord won't start

I have a 81 amc concord. I drove it and it died and went to start it again there was nothing. Replace starter battery and starter relay. There is no headlights no buzzer no radio no dome light. Any ...
4
votes
2answers
202 views

Troubleshooting a Misfire

Car: 2005 Dodge Grand Caravan In the past few days I started to feel the engine stumble. Yesterday the engine light came on and the error was a that cylinder 4 was a misfire (there was also a ...
1
vote
2answers
4k views

Why bikes with gears are preferred when there is gearless(or automatic gear) technology?

I know that lower gears have higher acceleration & low top speeds and higher gears have low acceleration & higher top speeds. But I would like to know why this gear system was designed first ...
-1
votes
2answers
149 views

The disadvantages of mitsubishi lancer 2007 [duplicate]

I am planing to buy a new car that has to be good enough to be used everyday . I have tried the speranza and the brilliance but weren't good and not reliable to be used everyday . Many friends ...
4
votes
3answers
508 views

Why are drive by wire systems so unresponsive?

Purchased a honda Fit seeing their reasonable price and good engine power. However I have a lag between me pushing the pedal and the engine responding. I constantly have to downshift to get any power ...
2
votes
4answers
2k views

Is starting idle RPM always lower in colder temperatures?

I've noticed that my 2008 Jetta 2.5L 5W40 generally starts up with an idle RPM of at most 1.2K RPM around the freezing temperature (say when the temp sensor reads 33°F), or even at just about 1K ...
3
votes
2answers
356 views

Mini Cooper P1638 code

I have a 2007 Mini Cooper. It keeps throwing code P1638 on my code reader on these really really cold mornings, and the engine seems to search for idle, reving betwween 500RPM and 1400RPM. The car ...
3
votes
1answer
466 views

Should I run my generator dry in preparation for storage?

I think this is on-topic after reading the FAQ, so I figured I'd go ahead and ask. I gave my gas generator its scheduled 3-month interval "workout" last night, and after letting it run for about 30 ...
3
votes
2answers
3k views

My battery was too low, and now my check engine light is on

I've noticed it in the last year (2013) that my 2008 Jetta with the original OEM battery would be taking a little longer to start than before, sometimes (but very rarely) not starting in the amount of ...
3
votes
2answers
294 views

Going more than recommended Speed in Break-in Period

I have a new Yamaha motorbike. Seller told me not to ride speed more than 50 Kmph for first 1000KM but I rode it 60 for 10 - 15 minutes due to some reason. How does it affect to my Motorbike ?.
2
votes
2answers
13k views

What is the purpose of a drive-shaft?

what is a drive-shaft and why we need it in a car? I do get the point of having crankshaft (using Wikipedia) but still confuse with drive-shaft
0
votes
0answers
51 views

Remove dark layer of particles stuck in Diesel engine tubes?

My BMW E36 M41 engine seems to have a dark dust in the small tube that goes out from the EGR valve. (the other tube contains a sort of dark liquid...) Is it advised to cleanup that dark matter ...
1
vote
1answer
95 views

How to spot remove high temp engine paint?

I've recently painted an engine post reassembly, due to cost reasons. No doubt I've encountered overspray on certain parts. I know sandblasting the engine proper is a huge no-no, and soda blasting ...
2
votes
1answer
65 views

Engine Whine Problem

I have a 2000 Ford Explorer V6 4.0, manual. I bought it brand new and have put just over 175,000 miles on it. I was driving down a dirt road to my home and noticed what sounded almost like a hissing ...
4
votes
2answers
2k views

Polo TDI 2004 - intermittent power, smoke, turbo issue

Car: Polo TDI 2004 1.4 with 190,000 km (118,060 miles) on the clock. While Issue: driving it intermittently (distance/time are not factors it seems) it starts to spew black/dark grey smoke and all ...
0
votes
2answers
282 views

Proton jumbuck loss of power/shaking

I was driving to work this smorning when my car started shaking and losing power no matter how much I put my foot down after about 2km of driving it started working fine again but the engine has a ...
2
votes
1answer
3k views

How much does displacement affect performance?

I'm interested in learning more about the steps that can be taken to increase the performance of an engine. I'm curious how much displacement affects performance. For example, compare the following ...
2
votes
2answers
130 views

What does CC refer to when describing an engine?

I have been learning about various older cars on Wikipedia. I've always wondered what the "cc" refers to in the engine description. For example: 1964–1969 Porsche 911: 1991 cc 1965-1969 Porsche 912: ...
4
votes
1answer
4k views

Which Reluctor Wheel on LS Engines?

Around 2005 or 2006, GM started using a 58-tooth reluctor wheel, where before they used a 24-tooth wheel in the LSx based engines (LS1, LS2, LS3, etc.). This wheel is used as a way for the computer to ...
5
votes
3answers
1k views

Cylinder 1 and 4 has low compresion, after engine has been redone

I have a Opel Corsa 1999 B type. We had a mechanic redo the engine about 4 months ago, but this week it just does not want to start. Today had other mechanic look at the engine, and did a quick ...
4
votes
2answers
167 views

Can I use a CNC machine or waterjet to make an adapter plate to adapt a 5 speed transmission to a rare, obsolete engine?

I am the sad, proud owner of a Nissan SD33T (Diesel), mated to a 4 speed T-19. The power this engine outputs (101HP, 160#/TQ stock) means it struggles on the highway, and I don't want to sacrifice my ...
2
votes
3answers
113 views

When should we change the machine lubricant? Cold engine or hot engine?

According to the manual, we should change the lubricant when the engine is still hot to easy the lubricant flow out completely. But from other perspective, loosening the bolt at the high temperature ...
2
votes
1answer
94 views

drove without #3 cylinder plug wire. Help!

I drove without a spark plug wire in my 1978 GMC Sierra 5.7L. It drove fine and I didn't notice any problems until it died after about 2 miles. It was acting as if it was out of fuel or power when it ...
2
votes
2answers
119 views

1997 ford f150 lariat

We have a 1997 ford f150. My husband replaced the thermostat, but it still reads cold and doesn't put out any heat. Any suggestions? We are in Ohio, it's December, and it's freeeezzzing - need heat! ...
5
votes
4answers
650 views

Engine repeatedly dies at shorter and shorter intervals this cold morning, finally won't start

I have Pontiac Grand Am 2004. It's been needing some regular maintenance, but other than that runs mostly fine. When I went out to start it this morning, it started fine. I went to start brushing snow ...
3
votes
3answers
4k views

Engine power specification at different rpm?

Car companies advertise power of an engine at different rpms. Car 1: 80 PS at 6000 rpm Car 2: 85 PS at 6500 rpm What does the power at different rpm mean? Does it mean Car 1 has better power than ...
4
votes
3answers
3k views

Slower Engine Start When “Cold”

I have a 2012 Honda Civic EX (4 Cyl Automatic, 5-speed transmission, Regular Gasoline). I get it serviced regularly and it has around 28k miles. The engine light has never come on. I am noticing this ...
2
votes
2answers
750 views

Changing Motor Mounts

My 2007 Ford Focus ZX3 SES (65k miles ) has a vibration at all engine speeds. Other research has led to a high probability that this is from worn out motor mounts. I have read after market ...
3
votes
2answers
106 views

Where can I buy the 2005 Mazda 3s 2.3L oxygen sensor plug?

I bought an oxygen sensor with the wrong plug. I wonder were could I buy a plug like the one on my car in order to connect the oxygen sensor properly? This is an image of the plug on my car. Does ...
4
votes
2answers
120 views

vanagon lurches forward, won't accelerate past 20mph or so

I have a manual 1982 diesel VW Vanagon with a 1996 Passat TDI engine in it. This morning (low 40s temp), accelerating up a hill, heard a hissing sound in left rear. Check tires, no problems. Able ...
2
votes
1answer
233 views

Oil in coolant none in oil

I have a 2003 F150 with a 5.4 engine. It started running rough and I noticed oil in my coolant. I checked the dipstick and it is clean. I was just a little low so I added oil. When I removed the oil ...
1
vote
1answer
83 views

Idle sometimes too high (BMWM50B25TU)

Yesterday I had to drive a lot and after 100 miles I noticed that the idle won't go below 1500 rpm (should be 600) on my 1993 BMW 525i (euro model), except when I drove slowly in a high gear. This ...
2
votes
1answer
179 views

High pitched noise from engine unless brakes engaged

I'm driving a manual 96 Toytota T100, and recently the engine started making a high pitched, almost inaudible whine. Some things I've loosely figured out: It always stops when the brakes are ...
6
votes
3answers
4k views

How to begin learning engine tuning?

Quite simply, I want to begin tuning and modifying automotive engines for hobby. I have always been fascinated with cars, and I want to become knowledgeable in as many aspects of car tuning as ...
2
votes
3answers
376 views

VW Jetta II - engine misfires when climbing a hill

This is a VW Jetta made in 1984 with 1.6L petrol engine (code "EZ"). It starts OK (though if it has been a wile since last start, it takes some cranking to start the engine), but when climbing a hill, ...
12
votes
4answers
12k views

Driving in second gear at 65+ mph

I accidentally drove my 2000 Grand Marquis on second gear on the highway. I was going 65 for like 5 minutes and tried to get it to 70mph but the car was shaking, when I realized I put it into regular ...
3
votes
2answers
301 views

OVERHEATING 07 grand prix

My car has been overheating bad I took it to auto zone and hooked it up to the check engine thing and they said it was getting to 207 withing 10 secounds. It get hot fast and my heat doesnt work ...