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19 votes
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Can I confirm clutch slippage by shifting without disengaging the clutch (while stopped)?

It could possibly work, but the better question is why would you want to test it this way? You'd be "grinding the gears" for no reason (even though it's the synchros you'd actually be grinding). This ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
16 votes

How can I detect vacuum leaks without access to a smoke machine?

There are several methods to detect vacuum leaks of unmetered air into the fuel delivery system One method is to use soapy water in a spray gun. The real issue here is how are you going to detect a ...
DucatiKiller's user avatar
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13 votes

How can I detect vacuum leaks without access to a smoke machine?

One tool overlooked here is an ultrasonic leak detector. They work by listening to the noise of a leak. Obviously they would be better used in a totally quiet environment, but it's a possibility. ...
zipzit's user avatar
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11 votes

Technique to test an alternator - fact or fiction?

To directly answer this question, no it won't work and you run the risk of damaging your alternator if it is good while doing so. The test you are asking about was used quite successfully with ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
10 votes

How can I detect vacuum leaks without access to a smoke machine?

Some people have stated listening for a vacuum leak noise and if located within a vicinity disconnect and add a new line of the same diameter and get a cigar and blow smoke from the cigar in the line. ...
Hᴇʀʙɪᴇ's user avatar
9 votes

Can I confirm clutch slippage by shifting without disengaging the clutch (while stopped)?

I would not recommend it: Most likely something will experience excessive wear or damage. There are some other advices on various "tests" around, mostly they test if the engine stalls while pushing ...
Martin's user avatar
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8 votes
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Firing a Coil on Plug

You would follow these simple steps. Remove plug from engine Place plug into coil wire Make sure threads of the sparkplug are grounded to a metal surface. Validate metal surface goes to ground by ...
DucatiKiller's user avatar
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8 votes

How can I detect vacuum leaks without access to a smoke machine?

@DucatiKiller gives a very good assessment of how to look for leaks. Using these same efforts, you can also use gas from a propane torch around the same areas described. When the gas finds a vacuum ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes

How can I detect vacuum leaks without access to a smoke machine?

One other way to look at this, sort of from a different direction. As I get older I really like being able to do more with less and do so safely. I think its sometimes awesome that an old guy with ...
zipzit's user avatar
  • 6,559
8 votes

How can I detect vacuum leaks without access to a smoke machine?

This is how I diagnosed a vacuum leak in my car. I removed the air filter from the intake pipe (mine was a turbocharged lancer evolution with an after market intake pipe) started the car. (Make sure ...
Vish_evo's user avatar
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7 votes
Accepted

How to check if spark plugs are firing? Coil-on plugs

You should have 2 coil packs on the back side of the engine near the throttle body. Wires run to individual cylinders. I don't know how easy it would be to find locally but you can use an inductance ...
Ben's user avatar
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7 votes

How can I detect vacuum leaks without access to a smoke machine?

Another way that has not yet been mentioned is artificially creating a vacuum or pressure in the intake. Vacuum is naturally there when the engine is working, but often the iconic hissing sound a leak ...
I have no idea what I'm doing's user avatar
6 votes

How can I detect vacuum leaks without access to a smoke machine?

There are usually two parts to this diagnosis: Establish that you have a vacuum leak If confirmed, find out the source of the malaise Confirming the presence of a leak My favorite trick to ...
Zaid's user avatar
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6 votes

In Cylinder Pressure Testing With a Pressure Transducer and a Oscilliscope

I use pressure transducers to test for cam sync problems. And other problems. Cam sync problems are seen on the waveform in a section called the exhaust ramp. The middle of the ramp moves back and ...
Fred Wilson's user avatar
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6 votes

How can I detect vacuum leaks without access to a smoke machine?

If it's a vacuum leak, it will be sucking in air, and you'll probably be able to hear it. With the rest of the engine making noise, using something to pinpoint the sound would help: Take a piece of ...
Xen2050's user avatar
  • 698
5 votes

How can I detect vacuum leaks without access to a smoke machine?

I've used a stick of burning incense. Cheap and simple!
Dave Black's user avatar
5 votes
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In Cylinder Pressure Testing With a Pressure Transducer and a Oscilliscope

Analysing in cylinder pressure waveform is extremely useful in developing combustion strategies in OEM R&D environments and also for diagnosing lots of issues. I have taken picture and its ...
Vish_evo's user avatar
  • 576
5 votes
Accepted

Subaru clunking and whining - differential?

My WRX is a somewhat different setup but, Subaru being what they are, most of the equipment is very similar. But yesterday, it started making really awful clunking and grinding noises whenever I'm ...
Bob Cross's user avatar
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5 votes
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Used Car Condition - Is a Compression Test a good proxy of engine health? (and what's a leak down test?)

A compression test will only give you a general idea of engine health It WILL NOT help you to understand if there is gunk buildup in the engine It WILL NOT tell you if you have a specific issue with ...
DucatiKiller's user avatar
  • 32.9k
5 votes

Can I confirm clutch slippage by shifting without disengaging the clutch (while stopped)?

It would make a horrible noise and probably wouldn't actually let you engage the gear due to the actions of the syncros. A better test would be to engage a gear with the clutch depressed, handbrake ...
Steve Matthews's user avatar
5 votes

Simple fool proof way to identify Bank1 and Bank2 side

Unplug one of the oxygen or EGT sensors and a open circuit fault bankX will appear. You can use that to determine what side is what.
Newbie Noob's user avatar
  • 2,781
5 votes

Fuel rail pressure - how long should it hold?

Every manufacturer has it's own rates of residual pressure. A general drop in pressure would be about a pound a minute dropping no more than 10 pounds. Usually a bad fuel pump or leaking lines will ...
Jupiter's user avatar
  • 3,320
4 votes

In Cylinder Pressure Testing With a Pressure Transducer and a Oscilliscope

Most accurate way to diagnose plugged exhaust (not severe) or chain stretch is to compare to known good waveforms on same engine and year. Like any other diagnostic tool of this type it takes time and ...
Moab's user avatar
  • 7,990
4 votes

Coil On Plug, Testing The Primary Coil

Check out the General Technologies TA500. This tool is quite inexpensive (for its incredible capabilities) and very flexible. Perhaps not for the DIY set, but there's no probing involved and it ...
SteveRacer's user avatar
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4 votes
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Diagnosing an engine oil leak

On that engine the cam(2), crank(1) and balance shaft(1) seals are the only place that can leak oil behind the timing cover. At 190K I guarantee they are all leaking, Crank usually leaks the worst ...
Moab's user avatar
  • 7,990
4 votes

Used Car Condition - Is a Compression Test a good proxy of engine health? (and what's a leak down test?)

It is good to check first if the coolant in the radiator has oil droplets inside, and if the oil (most of the times using the dipstick) has water inside. Then with a compression test you will be ...
Alimba's user avatar
  • 405
4 votes
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Best way to access fuel efficiency data during operation?

Yes the OBD-II port can supply data about average fuel economy and instantaneous fuel economy. There are devices on the market that can be purchased and used for fuel consumption monitoring as well as ...
Dalton D's user avatar
  • 1,958
4 votes

Can I confirm clutch slippage by shifting without disengaging the clutch (while stopped)?

Like @Pᴀᴜʟsᴛᴇʀ2 said, it might work. However, shifting in without depressing the clutch pedal is decidedly not good for the transmission. If done too much, your car could have trouble staying in ...
anonymous2's user avatar
  • 5,235
4 votes

P0300, P0302, P0303 on 2003 Honda Civic 1.7

Generic misfire troubleshooting: fuel: check the fuel pressure and electrically test the injectors air: check the air filter for obstruction, MAF for cleanliness, IAC valve for cleanliness. When in ...
tlhIngan's user avatar
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4 votes
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P0300, P0302, P0303 on 2003 Honda Civic 1.7

Beyond doing the basics such as checking compression and visually confirming spark and fuel pressure (with a gauge). It's time to break out the scan tool and scope. High mileage Honda's tend to suffer ...
Ben's user avatar
  • 10.7k

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