Compression test...won't hold psi...blown motor??
#1
Compression test...won't hold psi...blown motor??
Hi,
I went to do a compression test on my friends 88 TII. He just got it and doesn't know much about them. I've done them before...pulled the lower spark plugs, screwed in the tester piece and attached the gauge. Its a snap-on kit. Its quality. Anyway, he craked over the motor and the gauge needle bounced but it didn't go above 15psi. I tried to got an overall compression by not holding the release button but it wouldn't build compression. The needle bounced up to about 50-60psi but then it would go back to 0. What the hell?? Why won't it hold?? I thought it was busted so I tried on my father's truck and it works fine. Has to be the motor. I got the same readign for both rotors. That what made me doubt the tester... I dont understand why the gauge wont hold compression when I dont hold the release button and air is going into it???? I started the car up to listen to it. Real hard to start. Wouldnt idle unless i gave it gas. Blows white smoke everywhere. wouldnt stop. I shut it off. Whats going on????? Please help.
Thanks
-Ryan-
I went to do a compression test on my friends 88 TII. He just got it and doesn't know much about them. I've done them before...pulled the lower spark plugs, screwed in the tester piece and attached the gauge. Its a snap-on kit. Its quality. Anyway, he craked over the motor and the gauge needle bounced but it didn't go above 15psi. I tried to got an overall compression by not holding the release button but it wouldn't build compression. The needle bounced up to about 50-60psi but then it would go back to 0. What the hell?? Why won't it hold?? I thought it was busted so I tried on my father's truck and it works fine. Has to be the motor. I got the same readign for both rotors. That what made me doubt the tester... I dont understand why the gauge wont hold compression when I dont hold the release button and air is going into it???? I started the car up to listen to it. Real hard to start. Wouldnt idle unless i gave it gas. Blows white smoke everywhere. wouldnt stop. I shut it off. Whats going on????? Please help.
Thanks
-Ryan-
#4
Originally posted by vosko
pull the plugs. pull egi fuses. crank listen for loud even whooshes. if you miss a whoosh you need a rebuild
pull the plugs. pull egi fuses. crank listen for loud even whooshes. if you miss a whoosh you need a rebuild
fcturbo2- if you mean the valve you push to release pressure in the gauge, no. Its still there.
The compression tester works, I verified it on another motor. When used to test the TII motor, it wont hold compression even though the needle on the gauge bounces to 50-60psi on each "woosh"
#7
Originally posted by PvillKnight7
I must not have explained it clearly...I did all that. I've done this before.
fcturbo2- if you mean the valve you push to release pressure in the gauge, no. Its still there.
The compression tester works, I verified it on another motor. When used to test the TII motor, it wont hold compression even though the needle on the gauge bounces to 50-60psi on each "woosh"
I must not have explained it clearly...I did all that. I've done this before.
fcturbo2- if you mean the valve you push to release pressure in the gauge, no. Its still there.
The compression tester works, I verified it on another motor. When used to test the TII motor, it wont hold compression even though the needle on the gauge bounces to 50-60psi on each "woosh"
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#8
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Originally posted by PvillKnight7
I must not have explained it clearly...I did all that. I've done this before.
fcturbo2- if you mean the valve you push to release pressure in the gauge, no. Its still there.
The compression tester works, I verified it on another motor. When used to test the TII motor, it wont hold compression even though the needle on the gauge bounces to 50-60psi on each "woosh"
I must not have explained it clearly...I did all that. I've done this before.
fcturbo2- if you mean the valve you push to release pressure in the gauge, no. Its still there.
The compression tester works, I verified it on another motor. When used to test the TII motor, it wont hold compression even though the needle on the gauge bounces to 50-60psi on each "woosh"
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