Questions tagged [testing]

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SH honda 125cc 2015

I'm seeking to upgrade to new bike, SH Honda 125cc, but i was wondering if anyone has idea or experience with this bike ? such as common issues ?
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3answers
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Will a carbureted engine have different fuel consumption rates based on external load, with the same RPM?

I have a small Briggs and Stratton Model 19 engine, net power of 10.0 HP. If I ran the engine at full throttle without any external load connected to the output shaft, would it consume the same amount ...
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1answer
99 views

Emissions - High CO Reading

My 2004 Volkswagon Polo has just failed its emissions test. It has failed on the CO only, everything else is okay. The results are as follows: Engine/Oil Temperature: 92℃ (720 RPM) Low Idle ...
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39 views

testing auto 4L60E transmission while not in vehicle

is it possible to test while not installed in vehicle my auto 4L60E transmission
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2answers
94 views

My 2008 Mazda 3 TS D passed it's MOT, but with seemingly low service/parking brake efficiency. Should I be worried?

I have a 2008 Mazda 3 TS D. It's my first car, so I'm still unsure as to what is normal and what is not. I'm in the UK (Northern Ireland). It recently (Saturday) passed it's MOT, but the parking/...
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590 views

Can knocking noises caused by anti roll drop links be intermittent or just not detectable until they get worse?

So I was getting a knocking noise from under car and mechanic 1(who just had axle stands i.e. no ramp) said its either the anti roll bar or ball joint and there was no way of knowing which you just ...
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1answer
288 views

Are mineral oil smoke test machines sensor safe?

So there's heaps of DIY smoke test machines demonstrated around the web. I learned to built one of these, was kinda fun. It worked, even found a crack on my air intake that was messing with the ...
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2answers
90 views

Determining Expected Battery Voltage With Vehicle Running

To my understanding, a simple first-step for testing the alternator and related components on a vehicle is to monitor the voltage (using a multi-meter) at the battery while the vehicle is running. ...
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2answers
81 views

Electrical Diagnostic Procedural Lists [closed]

Post your general/specific Testing/Diagnostics Procedural Lists for Automotive Electrical Systems. These procedures are intended to target vehicles with modern 12V systems. The format of the site ...
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3answers
165 views

Dealership's service dept drove my car 19 km

I left my car at the dealership for a few hours today to get my suspension looked at and to find out what was causing the creaking noises coming from the back. The service advisor told me that the ...
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1answer
39 views

Fuel Pressure Relief Procedures - Evaluating Different Approaches

Relieving fuel system pressure is obviously an important prerequisite to many repairs and maintenance tasks. However, it seems as if there are a variety of recommendations to relieve the fuel pressure....
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1answer
74 views

Hyundai tester software

Is there any PC software to see the sensors value and change there parameters, or how I can do that for my Hyundai.
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1answer
64 views

How to figure the best state of tune for custom four-stroke single?

Hullo all, I will try and keep this short and straightforward. I have a 160cc 4 stroke single cylinder motorcycle. I have installed a big bore kit, a high-lift camshaft, a performance CDI, free-...
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1answer
60 views

How to Tell No MOT Advisory Notes?

In the UK, the MOT test may contain advisory notes but as far as I understand these are optional. One can also check the MOT history of a vehicle through Gov.UK web site. However I don't understand by ...
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1answer
3k views

Should I do combustion gas test in radiator or reservoir neck?

I bought this cooling system combustion leak tester. I have a few questions regarding its usage: While the instructions say take off the radiator cap and insert tester, it appears that at least some ...
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1answer
12k views

What is surface charge and how does it affect battery testing?

I've read in numerous places that "surface charge" can give false positives when testing a battery, and you need to remove the said surface charge to get an accurate result. I've also read various ...
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Results surprising said lab reporter of emission testing on Toyota Qualis Diesel 4 wheeler on AVL DiTest MDS 205

I got emissions of Toyota Qualis Diesel car tested with the AVL DiTest MDS 205, the result sheet had following columns rpm, temp, secs, CO(%vol.), CO corrected, CO2(% vol.), HC(ppm),HC corrected(ppm),...
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11k views

Emissions - High CO reading only

My 1999 Honda CRV has just failed it's UK MOT test on emissions. Results are below: 1st test: CO 0.73 (FAIL - max is 0.30) HC 78 (PASS - max is 200) Lambda 1.008 (PASS - between 0.970 & ...
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1answer
3k views

What do professional battery testers actually measure?

When a garage hooks up their battery tester what does it actually measure and how does this differ from tests you might perform yourself with a volt-meter? For example, recently a garage measured my ...
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When will a new emission driving cycle be implemented?

For emssion tests, they have used the NEDC driving cyle here in Europe for quite a while now. I'm not sure about America and Asia, but i believe they use similar driving cycles. After the emission ...
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1answer
94 views

How Long to Power the Injectors for a Fuel Pump Volume Test?

I want to do a fuel pump volume test on my 98 Mazda 62 2L GF, but the WSM doesn't say how long to energize the injectors: I'll probably activate the injector by back probing the injector ground wire ...
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1answer
326 views

Is 12 volts safe for testing injectors?

I'd like to do a volume test on my injectors, and was thinking that I would activate each one by jumpering it to the battery ( about 15 seconds per injector. ) The thing is that if I understand ...
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1answer
106 views

Tie-rod final test

After replacing the tie-rod and bellows boot, the steering wheel was rotated left + right: wheels moved as expected. Is there any other simple test that could / should be done?
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1answer
727 views

Have my tyres been tampered with?

I took my car to the garage and arranged with them to replace all 4 tyres. I'd order the tyres to the garage and they'd fit them. I also asked the mechanics to check the tyres manufacturing date and ...
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1answer
88 views

Is the diagnosis from a battery/starter/alternator tester meaningful?

At many auto parts stores they will test - often for free - a vehicle's electrical system by attaching a device to the positive and negative terminals of the battery. That's all they do. Then you ...
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1answer
768 views

Are resistance/capacitance based brake fluid testers reliable?

I would like to test my brake fluid to see whether it needs replacing rather than spend the time and money on it unnecessarily. I've seen inexpensive brake fluid testers on the market which work on ...
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4answers
219 views

Do no-name tires go through thorough testing?

Tire (tyre) brands come in three categories: Major brands that advertise extensively Relatively unknown brands that are actually made by the major brands Relatively unknown brands that are ...
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3answers
15k views

Hand-testing Shock Absorbers

Does manually hand-testing shock absorbers have any validity for checking if a shock is good or bad? Does hand-priming shock absorbers help? I usually hand-prime shock absorbers that I feel are ...
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1answer
952 views

The Testing Procedure for the Mazda 626 Alternator in the WSM is Unclear

I have some questions regarding the alternator testing procedure outlined in the 98 US work shop manual ( this is related to my battery warning light question ), my car has the FS engine: When it ...
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1answer
2k views

How to test the function of a water pump?

Is it possible to test a water pump for proper function (ability to move a certain volume of coolant) without disconnecting it from the engine? If so, how would one do that?
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1answer
168 views

What Is The Output Voltage For The Mazda 626 GF 2L 98-2002 Coil Pack?

I've seen aftermarket "high voltage" coils that output 40kV, but what is the output voltage for the standard OEM coil pack? I want to use a spark tester with an adjustable gap to check the strength ...
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2answers
77 views

The top speed in the my owner's manual seems to be too low. Is this normal?

How the quoted figures for top speed determined for a car (from 2003)? To be specific, my 2003 Opel Agila 1.2i has a quoted top speed of 96mph, but I have exceeded this on several occasions on flat ...
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1answer
6k views

Does driving at top speed damage a car or stress the engine?

Lots of manufactures like Vauxhall/Opel and Ford seem to test their new models of cars by driving it at top speed for hours on end. What is the point of this? Does it stress an engine?
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1answer
3k views

How do I test fuses with a circuit tester?

Lights all flicker. When I an in the cabin the head lights flicker. I want to test my fuses with a circuit tester. Should the engine be running or will I be blown away? Please help, I'm a newbie ...
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1answer
6k views

How Many Times to Crank During a Compression Test

I've read a number of different recommendations on how many times to cranks the engine during a compression test. I've read those that say to crank until you reach a stable reading. In the book, ...
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751 views

How is barometric pressure related to emissions testing?

In the VW emissions cheating scandal, news reports say the following: According to the EPA, "the position of the steering wheel, vehicle speed, the duration of the engine's operation, and barometric ...
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1answer
2k views

Checking a fuel pressure regulator that is out of the car

I happen to have a fuel pressure regulator of a petrol car lying around left by the previous owner and suspect that it might be still good, since the previous owner was just changing parts randomly ...
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1answer
15k 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: ...
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1answer
8k views

Cylinder Leak-down vs Compression Test

I understand that both cylinder leak down and compression tests are used to test for cylinder head, cracks, warps, and gasket leaks. I understand the difference between how each works: compression ...
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1answer
47 views

How does cylinder leakage tester kit work?

I was browsing Amazon in search for a combustion leak detector (AKA "block tester") and I stumbled upon a cylinder leakage tester kit, which is supposed to do similar things? But I am not quite sure ...
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1answer
2k views

Is there a way to test ignition coils with built-in ICM?

My car's service manual shows this for the ignition coils: What is the ICM? Related to https://mechanics.stackexchange.com/a/2850/31, is there a way to check the coils to see if they are working ...
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1k views

Block Test: Can't suck any more air, is this normal? (1999 Suburban)

I performed a block test recently to diagnose a problem I'm having. The liquid stayed blue, but I want to clarify I have done this right. The purpose of the test was to see if I could prove a head ...
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21 views

Car Radiator Fan may have a Fault, I'm an electrical noob [duplicate]

I took the fan out from my engine compartment and am now ready to test it. It consists of two fans, one larger than the other connected I believe in series with two large wires, one red, one brown ...
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4answers
5k views

How do I know when to replace shock absorbers?

In my last trip to the shop, the mechanics told me that I should replace my shock absorbers. When I inquired as to why, I don't feel that they were very clear with their answer, like they normally ...
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21k views

Test Gasoline for Water Content

I live in a small town, and the Gas station there has a bad reputation for gas quality. With rumors like peoples gas tanks freezing solid and such. Is there a quick, safe, cheap way to test for ...
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1answer
122 views

Strokes during compression test?

Just wondering what the general consensus out there for the amount of times the vehicle turns over during a compression test? I have heard anywhere from 5-8, and personally crank 7. What is the ...
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3k views

Finding a possible vacuum leak

One of our cars has a bit of a rough idle which disappears at about 1,000 RPM. After eliminating everything else I concluded that this is due to a minor vacuum leak. This was confirmed by the use of a ...