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Old 03-18-2004, 02:23 AM   #1
waitandbleed92
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Default What are the signs of a motor that is about ready to let go?

I am not having problems just wondering what the signs may be, like how can you tell that your compression is bad? or can you even tell with out having a leak down test ran? Anything like that type of knowledge would be helpful.
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Old 03-18-2004, 03:55 AM   #2
mr2guru
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Compression test is different than a leakdown test.

You can get a compression guage and do the test pretty cheap. A leakdown tester is a lil more expensive.

On the WRX if compression is down in one cyl. many times that will throw a misfire code.
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Old 03-18-2004, 12:53 PM   #3
shields102
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You could almost say, "many times, if you own a wrx, you will get a misfire code."

Lots of oil blow-by in the intake track. You may think that your turbo is gone. I personally know two people that sold turbos that they thought were blown( @ a discount) that were fine.......but their engines were not so fine.


Another thing would be a very rough idle.
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Old 03-18-2004, 06:09 PM   #4
vapore0n
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I guess overheating, smoke, burning oil. Bad signs of blown gasket. Bad hessitation. Or loud rattles followed by loud pops, followed by a loud boom, followed by you calling the tow.
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Old 03-18-2004, 08:45 PM   #5
Wombat North
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Usually it blows just after it goes the best.
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Old 03-18-2004, 09:50 PM   #6
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Quote:
Originally posted by vapore0n
I guess overheating, smoke, burning oil. Bad signs of blown gasket. Bad hessitation. Or loud rattles followed by loud pops, followed by a loud boom, followed by you calling the tow.
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Old 03-18-2004, 09:55 PM   #7
LiquidForce
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Misfires at idle was the calling card I recieved. The misfires then turned to knock at cruise and light acceleration.
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Old 03-18-2004, 10:17 PM   #8
waitandbleed92
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COuld someone explain what a misfire sounds like?
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Old 03-18-2004, 11:06 PM   #9
AlpineFD
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Quote:
Originally posted by waitandbleed92
COuld someone explain what a misfire sounds like?
bang bang
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Old 03-19-2004, 06:17 AM   #10
WRX Harvey
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A misfire sounds like a correct ignition event, it is just in the wrong place. Usually your motor runs with pretty close to evenly spaced firings in the cylinders, giving it the smooth idle you know and love. When you have low compression, or a bad spark plug, or some other problem causing misfires you will hear and feel a lumpy idle, the CEL may even flash at stoplights. I beleive that the conductivity of the fuel mixture drops at lower pressure, making for retardation. That is just my speculation.

A compression tester can be had for about 20 bucks and will tell you if you have a low compression cylinder. It is a good first test and is simple.

If you do have a low cylinder (more than 10% lower than the other 3), then you may want to do a leak down test. If you have access to a compressor capable of supplying 100psi with a small reserve tank on it you can do a leak down test. It measures the rate of loss in pressure. The testers can be pricey, so I reccommend having a mechanic freind help you with that one. With the compressor charging the cylinders, the leak can be easily found. You can hear it in the intake if it is an intake valve. If it is a piston or ring, air will be coming out the dipstick. If it is an exhaust valve you can cap off the exhaust with your hand in some cases. Fun with broken motors!

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Old 03-19-2004, 11:09 AM   #11
AutoSpeedWRX
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cling clang clang clang cling cling clang .....BANG
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Old 03-19-2004, 11:11 AM   #12
mrbigisbudgood
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Lets say your in 3rd gear WOT at about 5500 RPM and you hear a loud CLUNK BANG CLUNK K K K K BANG. This is a good sign that something has gone wrong.

"I think we threw a rod"

"Is that serious?"

"Yep"
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