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Engine Knocking under boost.



Well i haven't had a chance to switch the coils, but i have been driving it around. Its been fine for normal driving, i can get up to 50 percent throttle without any hiccups. Today i tried to go faster and it did it again. However it didn't show any misfires, and i am also not making full boost. at all, the most i got was 2 something pounds. So i'm wondering if maybe a vaccuum leak is part of it? Could the charger not be sealing to the manifold do anything like that? I don't have the boost solenoid hooked up either. It also shows the lowest timing i had was a couple degrees BTDC, which seems pretty low.
 
Just to help you troubleshoot...don't count on the scanner to show every misfire. There are times when you will feel it but not see it in the scanner. Its not 100% hit detection.
 
How is the BBV routed?

Vented to atmosphere?

Also, how are the vac lines routed.

I'd say post pictures of the setup. We might be able to point out something that you're missing.

Also; a funked up o2 will have plenty to do with how the car is running.
 


From the front to the top tree, the rear port is just plugged. The FPR is on the bottom Tree. PCV is routed to the bottom tree. And the accessory is on the top tree. The grooved idler pulley for the supercharger is bad, i have another one on the way. The odd thing is, is i can hear the charger whine, just don't see any boost.
 
Sorry, meant evap.

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The one that runs from the manifold to the vacuum tree doesn't need to be there. You can cap those two off. Drop the big loop off of the top of the tree to the bypass. You can take the bolt out of the top of the SC too I just put that one in there because I had an extra in my hand.
 
im in the mood for some spaghetti now. shorten up them lines.

heres your 97 vac line routing, cause you got a 97 blower.

looks like its a top swap cause the evap is up front, that line goes to the fat port on the side of the TB.

2011-07-04_145638_vacuum.jpg



looks neater this way too.

002_zpsg0w3kwui.jpg
 


****.

I'd get a '98+ blower.

Make life a metric crap ton easier.

And then let the BBV vent to atmosphere. No lines from the bottom of the valve.
 
Well tried to swap out the coils today. The middle coil is loose and one of the bolts is stripped so it just spins. On top of that it looks like the contacts are all rusty and dirty. So that definitely could be causing a misfire.
 
I don't think i've ever been so frustrated. I'm now making full boost but it's also knocking insanely bad. I just have no idea what it could be.
 
I'm scanning for kr through the torque app. At 12.5 degrees of timing and medium throttle showing a few bars on the gauge it spiked to 10 degrees of knock. Less boost in still getting it just not as bad
 


you got a issue for sure. checked to see if anything is hitting the firewall? you got headers? th eo2 can tag the fire wall and cause kr.
 
I know it's been mentioned, but not confirmed.
You can't just put a gtp MAP sensor on and go. The tables are still set up to run the GT settings, so the most the computer will ever see is about 2 pounds.
It's probably running lean and detonating. Just a guess. You have to look at the O2 readings when you get close or into boost to determine it.
 
Yeah I have headers. And see that's what stumps me, I had it tuned in car for the top swap. I think I'm just going to have to have someone look at the time and see it's in the tune.
 
Well, tuning in the car doesn't really matter if there wasn't a base GTP file used. I've tried it a looooong time ago when I first started doing things, and it didn't work.
 
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