Okay, I just got done running a compression test on the engine, but only tested the front 3 plugs. here they are.

1. 110
2. 120
3. 110

Is this good or bad? I know someone posted that they had 160 or something. Can anyone please explain these numbers?

 

anyone?

 

I am not sure how high they should be, but what you are looking for is consistancy. You don't want something like:

1)110
2)50
3)110

That would indicate that the number 2 cylinder wasn't as 'healthy' as the rest....just look for consistancy!

SHUMAX

 

Ask Emax, I think he posted that.

 

ok tanks

 

is that a cat in your sig shumax?

 

haha... when you said 'cat', i thought there was a picture of a catalytic converter... not a feline cat

-V

 

The Haynes repair manual says this:
Standard 185 psi
Minimum 142 psi
Maximum difference between cylinders 14 psi

Your compression test numbers would be more useful if ...
- you tested all six cylinders
- you tested "dry" and then "wet"

Please refer to Haynes, page 2C-7.

 

When I did my Test I got 168 PSI on each and every cylinder. From what I read the #'s should be whith in 10- 15% of each other so your 7% or so dieffrence is with in limits but according to Danile B. the #'s should not be as low as they are. There is a few things I would make sure you are doing correctly before you get alarmed,1st did you crank your starter for 5 solid seconds on each cylinder? Becuase if you did the #2 Cylinder for only two seconds and then the other Cylinders for 3 seconds this could be the cause of your low and incosistant results. Another thing I would check is to see if your Gauge holds the pressure acuratly becasue the PSI's may be dropping some in between you cranking your engine and looking at the gauge for results, if this is the case I recomend you either get a assistant or buy a better compression gauge. Good Luck

 

did you:

take out each spark plug
disconnect each injector plug
disconnect the ignition coil and remove ignition coils

depress the accelerator pedal fully to keep the throttle valve wide open

Is you battery at full charge?