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Compression test. Good? Bad?

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Old Mar 28, 2010 | 12:30 PM
  #1  
young_tuner's Avatar
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From: Bridgeport, TX, USA
Icon2 Compression test. Good? Bad?

Ok well here are the results

#1 155
#2 185
#3 175
#4 200

This car runs rich and is misfiring, can someone lead me in the direction to resolve this issue?

Thanks,
Ian

Also this car has no CEL showing up, it popped up once and i believe it was the code for misfire cylinder 1 and it was erased and never popped a code since then.

Last edited by young_tuner; Mar 28, 2010 at 12:32 PM. Reason: Add. info
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Old Mar 28, 2010 | 01:11 PM
  #2  
Sonin Fury's Avatar
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From: Indianapolis
Default Re: Compression test. Good? Bad?

those are def not good you should be about 190-220 to be within spec
How many miles are on the engine?
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Old Mar 28, 2010 | 01:41 PM
  #3  
Kronn 98SH's Avatar
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Default Re: Compression test. Good? Bad?

Bad
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Old Mar 28, 2010 | 02:08 PM
  #4  
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Default Re: Compression test. Good? Bad?

what's odd is I *thought* i had a healthy engine but just yesterday I checked mine and they came in at:

150
150
145
150
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Old Mar 28, 2010 | 02:12 PM
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Enzo15's Avatar
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Default Re: Compression test. Good? Bad?

^ Yours is ok, you want all cylinders to be within 10-15% of each other, which yours is. The OP's are not good at all. OP do a leak down test, that will narrow down where your problem is.
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Old Mar 28, 2010 | 02:48 PM
  #6  
young_tuner's Avatar
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Default Re: Compression test. Good? Bad?

all right so is it a ring issue? Or could it be a valve issue? 162-63k miles.

Last edited by young_tuner; Mar 28, 2010 at 03:06 PM.
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Old Mar 28, 2010 | 06:18 PM
  #7  
Enzo15's Avatar
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Default Re: Compression test. Good? Bad?

It could be a ring, valve or HG problem. do a leak down test and listen/ watch to see where air is escaping from. If you hear/feel air coming from the TB its the intake valves, if you feel/hear from the exaust its the exhaust valves. If you see air bubbles in the radiator when you take off the cap its most likely the HG. Some air will escape from the Valve cover/ dipstick tube, you just dont want an excessive amount of air coming out of them.
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