markp
15+ Year Contributor
- 44
- 0
- Feb 17, 2008
-
St louis,
Missouri
Hey everyone, I was wondering if you guys could help me with finding and fixing my boost leaks that I am currently having. Just to be on the same page, here is the list of the following I have fixed:
intercooler couplers
vacuum lines to fpr
throttle body gaskets
throttle body seals
injector o rings and insulators
After fixing these, I went from building 0 psi to 15 psi leaking 1 psi per second until ~10 psi where it then leaks very slowly to 0.
While testing, no matter how much air i put in, I could not test above 15 psi. After soaping EVERYthing, I found no leaks and could hear nothing..until I opened my engine oil fill cap. I then took off the PCV valve from the valve cover and pressurized once again to see if any air came out and none did, although the pcv is really old (should i change it anyway?). I then listened at the tailpipe for any sounds and did not hear anything.
After reading multiple threads, I decided to do a compression test ( my first one ever) and here are my results. I did this with the engine at full operating temperature, cranking while wot.
185-185-180-185
Then I did the wet test, adding a little bit of oil down the walls and got these results:
200-185-190-205
How worn are the rings based on these results? Would this cause me to not be able to test above 15 psi? It's really bothering me, especially because I'm trying to fix this problem where my car jerks for a second if I'm cruising at constant speed and throttle position which gets worse when it's hotter out. The plugs and wires are both relatively new.
Any help is appreciated!
edit: My biggest complaint is that the car doesn't even feel that much faster after fixing those first leaks and that it's REALLY annoying when the car bucks at constant throttle. It happens maybe once every 5-10 min in summer weather, and rarely in winter weather.
intercooler couplers
vacuum lines to fpr
throttle body gaskets
throttle body seals
injector o rings and insulators
After fixing these, I went from building 0 psi to 15 psi leaking 1 psi per second until ~10 psi where it then leaks very slowly to 0.
While testing, no matter how much air i put in, I could not test above 15 psi. After soaping EVERYthing, I found no leaks and could hear nothing..until I opened my engine oil fill cap. I then took off the PCV valve from the valve cover and pressurized once again to see if any air came out and none did, although the pcv is really old (should i change it anyway?). I then listened at the tailpipe for any sounds and did not hear anything.
After reading multiple threads, I decided to do a compression test ( my first one ever) and here are my results. I did this with the engine at full operating temperature, cranking while wot.
185-185-180-185
Then I did the wet test, adding a little bit of oil down the walls and got these results:
200-185-190-205
How worn are the rings based on these results? Would this cause me to not be able to test above 15 psi? It's really bothering me, especially because I'm trying to fix this problem where my car jerks for a second if I'm cruising at constant speed and throttle position which gets worse when it's hotter out. The plugs and wires are both relatively new.
Any help is appreciated!
edit: My biggest complaint is that the car doesn't even feel that much faster after fixing those first leaks and that it's REALLY annoying when the car bucks at constant throttle. It happens maybe once every 5-10 min in summer weather, and rarely in winter weather.
. 
