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Vac problem

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Boosted_talon98

10+ Year Contributor
170
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Apr 11, 2009
Keyser, West Virginia
Ok.. Ill start by saying I didn't have any axles in my tranny and in neutal my speedo was reading like 20-30 mph depending on how fast my car would idle when it was doing this I was pulling -10hg on my vac/boost gauge.. I just put the axles in and it fixed the idle it idles at 900-1000 now but vac says -1 hg and it doesnt wanna rev up at all it acts like it would rather shut up. I double checked then triple checked for leaks and all my vac lines are right. Does my ecu need some driving time to calibrate or what I am confused on why my vac now shot to 0 after putting axles in that fixed my speedo problem :S


*update*

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Did a compression check and read 1-0 2-65 3-60 4-75.... The car starts an runs is my compression tester bad.. I got 8:1 pistons mls hg .051... I had a local machine shop put 1mm o/s valves and crower springs and retainers and am running crower 3s.. All new so Idk is it possible they didn't install valves correctly and this is my problem?
 

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It's highly unlikely that your compression tester is bad.
I would triple check your timing, I'm willing to bet it's off and causing all of your issues.
Either that, or as you said, something was done incorrectly during the install.
 
It's highly unlikely that your compression tester is bad.
I would triple check your timing, I'm willing to bet it's off and causing all of your issues.
Either that, or as you said, something was done incorrectly during the install.

Ok. I am running AEM cam gears an timing mark is dead on crank and gears... Head had 1mm o/s valves, sbi lifters rockers were brand new, could my lifters maybe not pumped up or what.. I guess Ill try a leakdown and post results

btw heres head before installation

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RESOLVED.. no compression on cylinder 1.. thats why no vaccum

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RESOLVED.. no compression on cylinder 1.. thats why no vaccum

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Yeah, but look how clean that chamber stays :sneaky:

So was it your cam timing or your piston rings (or did the piston have a huge hole in it, LOL?) As Ryan alluded to, from the looks of your comp numbers you could have had a cam timing problem.

MB
 

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I am thinking rings I guess I will strip block down and go bi*** out the machine shop that charged me 2500 dollars for this damn thing..... I didn't even move the car its on jackstands LOL and it got that black
 
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