General internal combustion engine questions.

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6
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2answers
12k views

Engine Size and Fuel Consumption

I have this weird misconception that the engine size is related to the amount of fuel being burned in one cycle(4-stroke engine). I know this is stupid but how does engine size relate to the amount of ...
6
votes
4answers
2k views

Why does my car scream on cold start?

My 1988 Subaru XT6 2.7L engine screams at me on a cold start then it will stop and then do it again when I take it out of park, but then it stops. Also, my car is losing antifreeze. Any ideas why?
6
votes
1answer
213 views

Why are V engines less smooth?

I'm learning how to ride a motorcycle on a Suzuki Gladius SFV650, with a V-twin engine. But I also had the chance to ride a Kawasaki ER-5, which has a parallel twin engine (550cc). I've noticed that ...
6
votes
4answers
5k views

Engine oil change and getting rid of old oil completely

After running the vehicle for a certain distance usually we will change the engine oil. This will not only give engine new life with the brand new oil but will also get sludge and other sediments out ...
6
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2answers
1k views

2004 Ford Focus engine cover would not budge after all screws are removed

I have a 2004 Ford Focus SE 2.0L. There’s some oil leak on the engine. A mechanic told me it could be the engine valve gasket being cracked (the car is pretty old and never had a valve gasket change). ...
6
votes
1answer
367 views

Put Stop leak into engine. Can I reverse the process?

I accidently poured Barsleaks stop leak for the radiator into the engine oil compartment. Is there any way I can reverse the process? The stuff is hardening already. This a 2004 Volvo S80.
6
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4answers
51k views

Slow Accleration And Moving RPMs

UPDATE: I bought a scan tool and downloaded the torque app. I don't get any error codes. I decided to drive it again today. I drove about a quarter mile and barely got to 20MPH. I turned around and ...
6
votes
2answers
6k views

WHY does an engine stall? (manual transmission)

Before you write off my question as one that's been answered a million times already, I want to clarify. I understand that the engine needs to go a certain rpm and when you try to engage the clutch ...
6
votes
2answers
14k views

Engine Bogs down with A/C on highway

This started to happen relatively recent. It's 2003 Chevy Trailblazer. What is happening when the engine is idling and I turn the A/C on or the defroster (which also uses the A/C I believe), the ...
6
votes
5answers
9k views

Doing my own fuel induction service - how to, and how difficult?

Was recommended to get a fuel induction service for a 2002 V4 Camry, and am considering doing it MYSELF. The reasons for considering this are: My car idles a bit rough, especially when the AC is on. ...
6
votes
1answer
90 views

How are fuel injectors controlled?

I took the fuel injectors off of a wrecked Volvo 850 GLT 1996. I was testing them to see if they still worked by simply supplying voltage to them, and they do. I noticed that when I increase or ...
6
votes
2answers
4k views

Lugging the Engine (Manual Transmission)

So...lugging the engine obviously isn't something that is good. But why? For example when you feather a clutch to get the car moving, it lugs for a quick moment when you hit the catch point (When ...
6
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2answers
7k views

Oil pan threads stripped?

EDIT Helpful links on how threads got stripped and by who: http://tl.acurazine.com/forums/showthread.php?t=878261 Seems to be a common problem with some shops, where they don't take good care. ...
6
votes
4answers
48k views

Sputtering while driving & idling

[My car: 2004 Mazda 3] So, my wife came home from running some errands and told me the check-engine light was on and that the car was sputtering and felt like it was going to stall while stopped at ...
6
votes
2answers
3k views

Coolant/antifreeze leaking out of engine block (See photo/video)

I'm not sure exactly what is going on with my vehicle ('98 Wrangler, 4.0L), but it's pretty obvious something is wrong. I think I might have had some minor coolant leaking after the past few times ...
6
votes
2answers
566 views

Estimate for head removal / reinstall

In changing the spark plugs in my 2000 Ford Mustang GT (4.6L), I sheared one of them (number 3) The ceramic is totally removed, as is the hex nut. The threaded portion as well as the ground electrode ...
6
votes
1answer
1k views

Heater smells like sulfur

I drive a 2006 Toyota Sienna. When driving with the heater on I often smell sulfur. This is more common when I am driving up a hill, but if I turn the heater off, the smell goes away. What causes this ...
6
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2answers
2k views

BMW 530xd e60 2008 diesel engine turns but won't start

I have a problem with my BMW, just bought it, previous owner hasn't been facing such problems. When the engine is cold for e.g.: after night. Outside temperature is about -4 to +1 degree, engine won't ...
6
votes
2answers
2k views

What is this loud semi-regular clicking on a 2001 Honda CR-V?

Due to the nature of my problem I've had little success on Google. I appreciate any help. I have a 2001 Honda CR-V EX with 130000 miles on it and I'm the original owner. The week prior to my ...
6
votes
1answer
580 views

Supercharger Components That Can Fail

I have a 1998 Pontiac Grand Prix GTP, with the supercharged 3800. I recently made a trip from Meridian, MS to Cincinnati, OH, and back again (roughly 600 miles one way). With the car being relatively ...
6
votes
2answers
2k views

Really high idle after tightening spark plugs

I had a very nasty tick in my engine after doing a bunch of work to it, I just redid my chain tensioner which went a long way to fixing it, then I found that spark plugs could cause a tick, so I ...
6
votes
1answer
257 views

Fast idle when engine is hot

I have a 2001 Buick Century. Lately, after driving around long enough for the engine to get hot, the idle speed will sometimes race. The car will want to surge forward even when I'm not giving it ...
5
votes
3answers
1k views

why do engines have so much unused horsepower?

I've looked at the power rating of an engine used in a Humvee (5500 lbs) and was surprised it's only ~190 horsepower, which is exceeded by many 4 door sedans. So an obvious question is why doesn't my ...
5
votes
3answers
11k 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 ...
5
votes
4answers
10k views

How reliable is a second-hand Subaru 2.5 RS 04-05?

Basically, I've been a Subaru enthusiast for a few years but never been able to purchase one because I'm still a student. However, this summer I will be able to. The issue is that I need a reliable ...
5
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5answers
10k 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 ...
5
votes
3answers
1k views

What kind of engine oil to run a Diesel?

I got an 1987 Toyota Land Cruiser with a 2H diesel engine. I never changed oil on a diesel engine prior to this truck, so I'm a little confused. Toyota Factory Shop Manual recommend API CC oil type, ...
5
votes
2answers
24k views

Oil in coolant - how much trouble am I in?

I have oil in my coolant reservoir. Could it just be the head gasket or is it almost certainly the entire engine or might it be something else entirely? Thanks in advance...
5
votes
2answers
84 views

Can a full teardown of my 318 TDS (1996 1.7 Gasoil) E36 engine have bad side effects?

I would like to get more acquainted with the engine of my car, learn mechanics, and also just clean the engine of accumulated dirt and grime. As such, I am considering tearing down the engine. For ...
5
votes
3answers
12k views

2009 Toyota Camry 2AZFE idle vibration remains after new motor mounts

My wife's Camry went in to the shop 2 months ago for a rough idle. We bought the car used in February with 72K miles. We've put on 10K and decided to have a mechanic look it over and tell us what it ...
5
votes
2answers
66 views

Water leaking into frame case/engine?

I just had my 2012 Mini Cooper S (66K miles) repaired last week last week for a failed/leaky water pump. My car had an episode where it overheated and shut down and wouldn't start after pulling over ...
5
votes
2answers
396 views

Why does diesel engine have redline much lower than petrol engine redline?

why do diesel cars redline at around 4500 rpm whereas petrol ones around 6500 -8000 rpm? Does this have something to do with the compression ratio?
5
votes
2answers
278 views

Ditch water in radiator

I lost a coolant hose going down the road and all my antifreeze was gone. I found a puddle along the road and filled my radiator back up after I fixed the hose. Will this cause electrolysis in my ...
5
votes
2answers
311 views

When do engine type and mileage of a car affect pricing?

I'm currently designing a customer relationship management tool for auto shop owners and was wondering: Does engine type or the odometer value of a car ever affect pricing for a customer? What ...
5
votes
2answers
7k views

Why does my engine perform poorly and get bad gas mileage after using fuel injector cleaner?

At the advice of someone at a local auto parts shop, I poured a bottle of fuel injector cleaner into my gas tank. This happened around the same time that I had a brake job done and rotated my tires. ...
5
votes
4answers
6k views

Car dying at low RPM only after filling up with gas

My question is closely related to one about a Jag dying at low RPM, but is slightly different because it only occurs after refueling and because the problem persists after cleaning the throttle body, ...
5
votes
2answers
130 views

How to work on engine out of car?

I'm currently doing an engine swap on on 97 Corolla Levin, need to swap over the exhaust manifold, water pump etc from one engine to the other, but not sure what the best way to handle the engine ...
5
votes
4answers
16k views

Diesel Engine difficult to start

I have a diesel powered Audi A4 B7 (2006) 2.0TDi (the 170BHP variety) with a manual gearbox, which I've owned for around 18 months. The car has just short of 100k miles and has a full dealer service ...
5
votes
3answers
125 views

Honda FIT GP1 HYBRID 2011 knock

in my auto gear honda fit gp1 hybrid car, (mileage 56 000 KM) I had a engine tune up and changed my injectors (8 injectors) last month and after 2 weeks i started getting a slight knock (jerk or ...
5
votes
1answer
73 views

Acceptable amount of slack in a timing chain with high mileage?

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - 230,000 miles original owner. FWIW, this model car/engine does not have timing chain inspection and/or changing as part of the routine ...
5
votes
1answer
685 views

How does ambient temperature affect engine efficiency and fuel consumption?

I remember from my physics class that the ideal-gas Carnot engine is more efficient if the temperature difference between the heat source and the thermostat ("heat recipient") is larger ...
5
votes
1answer
7k 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
1answer
5k views

OHV vs. OHC: which is faster in speed, horse power?

What are the main differences in OHC and OHV engine designs, and which is faster or more powerful? Also, which is more reliable?
5
votes
4answers
628 views

Why does the power output peak and then drop as engine speed increases?

I have been looking at the power bands for my car (2000 Opel Agila 1.2) recently, as I want to work out when it is best to change gear and stuff, as I have no life! This is the approximate graph I ...
5
votes
1answer
43 views

Is cylinder leak down test needed if compression test results are fine?

If I compression test my engine and the results are fine, could there ever be any need to leak-down test it as well? IOW, can a leak down test ever fail if the compression test is fine. RELATED: ...
5
votes
1answer
201 views

Is it possible to paint my Mk1 Golf Engine in either Matte Black or Grey? If so, how?

I am currently doing up a Mk1 VW Golf and I have reached the stage where I need to make a decision on my engine paint. It will be at shows so I want something nice (but not Chrome). Is there any way I ...
5
votes
3answers
2k 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 ...
5
votes
1answer
132 views

Engine revs to 4000 RPM without pressing gas pedal

I tried to start my car today but something strange keeps on happening. It turns on just fine, but once the engine is operating it starts revving to 4000 RPM even though I am not pressing the gas ...
5
votes
1answer
75 views

What is the Carter Gas Filter for?

I'm confused with this, are there any combustion gasses in the carter and why do they need to be filtered? What is the Carter gas filter, where is it located and what is its use? Is there a way to ...
5
votes
1answer
275 views

Would a snapped valve necessarily seize the engine?

Long story short, after a brief near-redline excursion (a long tunnel and open windows may have been involved), and about 10 minutes of gradually loudening TAK-TAK-TAK-TAK that couldn't be drowned out ...