odd compression results...and fuel question.

I

Iand

New Member

Aug 18, 2004

50

0

0

Kelowna, BC

Feb 22, 2006

#1

• Feb 22, 2006

• #1

So i did a compression test before i started tearing down my engine and got what i think are some wierd numbers

150 = = 155

142 = = 142

138 = = 130

132 = = 125

FRONT​

The numbers slowly increase as you go towards the back of the car. Any ideas? Also, to disconnect the fuel lines from the fuel rails you need a special tool correct? Any help is apprectiated, thxs.

 

M

matm347

Founding Member

Aug 29, 2000

2,056

0

0

Feb 22, 2006

#2

• Feb 22, 2006

• #2

Fuel lines are removed with A/C disconnect tools, get the plastic set for ~$12 from any auto parts store.

Compression does sound strange, I assume you held the throttle to the floor??
I would retest, going in the reverse order from the previous test.

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Feb 22, 2006

#3

• Feb 22, 2006

• #3

Was this a dry or wet compression test? Was the YB held open while doing the test? Was the motor up to temp?

 

I

Iand

New Member

Aug 18, 2004

50

0

0

Kelowna, BC

Feb 22, 2006

#4

• Feb 22, 2006

• #4

dry, yes the throttle was held wide open, and no the motor wasnt up to temp. We ran another test, backwards this time, same results. Im pulling apart the engine because of an audible knock between 2000-2500 rpm on deacceleration. So far iv got the heads off, but cant see any visible excessive wear on valve train parts (pushrods/rockers/springs).