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The Terminator
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Leakdown Test
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<blockquote data-quote="thomas91169" data-source="post: 7562597" data-attributes="member: 40530"><p>OK dunno if i am doing this right.</p><p></p><p>i have the motor at TDC, im pretty sure cause ive tried it a 4 different TDC events and the same results on every one.</p><p></p><p>Im using a Harbor Freight tester.</p><p></p><p>Screw it into the sparkplug hole (i hear thats important), and hook up the tool. My compressor is regulating at 100psi. Now the directions say to use the regulator knob and add or take away pressure till you reach 0 on the percentage drop gauge. It only takes me till around 15-20psi on the tool's regulator gauge to hit 0% pressure loss. and then what? </p><p></p><p>i can still hear a hiss from the exhaust, even at 15-20psi of air going into the cylinder.</p><p></p><p>I am a leakdown n00b. Any other car i would have just pulled the motor (dsm so easy, low compression and oh well, pull the head in an hour or so), but i want to diagnose the issue before proceeding, instead of proceeding then diagnosing, this motor looks like such a pita to remove just for shits and giggles, and it is my DD so i want it down for as short as possible, so id like to get necessary parts in and then pull motor or whatnot, instead of pulling motor then waiting for parts.</p></blockquote><p></p>
[QUOTE="thomas91169, post: 7562597, member: 40530"] OK dunno if i am doing this right. i have the motor at TDC, im pretty sure cause ive tried it a 4 different TDC events and the same results on every one. Im using a Harbor Freight tester. Screw it into the sparkplug hole (i hear thats important), and hook up the tool. My compressor is regulating at 100psi. Now the directions say to use the regulator knob and add or take away pressure till you reach 0 on the percentage drop gauge. It only takes me till around 15-20psi on the tool's regulator gauge to hit 0% pressure loss. and then what? i can still hear a hiss from the exhaust, even at 15-20psi of air going into the cylinder. I am a leakdown n00b. Any other car i would have just pulled the motor (dsm so easy, low compression and oh well, pull the head in an hour or so), but i want to diagnose the issue before proceeding, instead of proceeding then diagnosing, this motor looks like such a pita to remove just for shits and giggles, and it is my DD so i want it down for as short as possible, so id like to get necessary parts in and then pull motor or whatnot, instead of pulling motor then waiting for parts. [/QUOTE]
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