Questions tagged [testing]
The testing tag has no usage guidance.
12
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16
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6
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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 ...
7
votes
3
answers
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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 & ...
6
votes
4
answers
6k
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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 ...
7
votes
1
answer
4k
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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?
8
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3
answers
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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 ...
8
votes
1
answer
12k
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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 ...
6
votes
1
answer
32k
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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 ...
5
votes
2
answers
3k
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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 ...
4
votes
1
answer
11k
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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, ...
4
votes
1
answer
259
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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 ...
2
votes
1
answer
174
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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 ...
0
votes
1
answer
456
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Upstream O2 sensor stays at 0.4V
To test the upstream O2 sensor on a 2011 Toyota Corolla, I backprobed it with a multimeter.
After I idled the engine for a few minutes to warm it up, the multimeter shows a steady voltage of 0.4V.
But ...