HELP ASAP, Just finished head gasket swap, did compression test,

BlueOvalStangGT

Active Member
Oct 27, 2003
2,849
0
46
Tampa Florida....USF!!!
#1
Hey guys I just finished swapping my head gaskets(thanks for the help BTW) and I did a compression test in the number 7 and 8 cylinders. I got 120 in #8 and 130 in #7. Is something still wrong? Its better then before but still not as good as my other cylinders. What could be wrong?
 
#2
That test is supposed to be done with a warm motor...cold, you may not get the seal you need for an accurate reading??

what are the other readings?? w/in 10% of those 2 cyls???

are the valves set-up??? hanging open a tad could skew the numbers???

did you test 7/8 before teardown and they were lower than the others???

bad rings in those cylinders if still low after the install???
 
#8
DARK-5.0 said:
Comments like this explain to me how your post count is so high. Haha, I'm just playin around Zach. But your right, what he said.

Jeremy
Click to expand...
Comments like this explain to me how YOUR post count it to high too haha not really

He sent me an IM asking me what I thought, so I answered cause he was outside with his car.
 
#9
did you check the head surface and block deck with a straight edge to see if its flat? head could by warped some. since its back together run it a while,heat cycle a few times(hot then cold) then re-torque the head and retest the compresion. good luck!
 
#12
I'm assuming it's coming from the engine? Will the car start and you aren't letting it, or it won't start and makes that noise?

I'd have someone go under the hood (assuming it's from the engine) and try to see exactly where it's coming from. Once you hear where it's coming from, the problem can (probably) be fixed quite easily.

Joe
 
#16
Maybe you have a valve handing open. That would be the only way your air filter or general area would make a sound like that. The air is escaping your cylinders and being forced back up to your intake and out the air inlet. I hope I am dead wrong on that and I seriously doubt that is the problem. Check your spark plugs and make sure they or one of them is not loose.
 
#17

You need to go back and check everything again. Start with the MAF, and go from there. Make sure every injector is in the right spot & make sure every vacuum line is attached. Then, if you still can't start the motor, recheck the rockers & make sure they aren't smacking the valve covers. Also, verify that the cam timing is correct.

Scott
 
#18
Funny you should have sound like that. I tried starting my car the other night with the dizzy 180 out and of course ir wouldn't start, but i noticed a soft drum noise too. You might as well check that too.

Jeremy
 
#19
1105 said:
Comments like this explain to me how YOUR post count it to high too haha not really

He sent me an IM asking me what I thought, so I answered cause he was outside with his car.
Click to expand...


Hey, just because I don't post in all the thread I read doesn't mean I need to be ridculed as I was. HAHA, just playing. Its all in good fun.

Jeremy
 
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