| Message |
:Background: This summer I spun a rod bearing, and bought a Stage 1 Shortblock from Kyle@IPP. Put it all back together, went through the break-in steps (oil changes, etc), took it easy for the first ~700 miles. Didn't actually try to up my boost until around 1000+ miles because I was getting my EBC moved and gauge pillar w/ boost gauge set up. Engine felt better and better, and once I got past the 700 miles mark started getting into boost, and it was feeling strong, acting like it should. Around 900 miles or so, I pulled timing belt to replace a leaking VTC gear (should have learned that simple test during rebuild).
:Ever since that timing belt work I've had hesitation and/or stumbling at higher RPMS, over 50+% throttle and in boost. If I go over 6 PSI using EBC (Greddy Profec II Spec-B), it will only momentarily go up, then return and hold at 6 PSI. Even if I return the EBC to the most basic settings I used during the break-in which basically always leave it open, I have issues. The crazy thing is before you get to about 50% throttle, the car feels fine, probably at least as quick as an NA. Anything past that, and it's just not hungry to do more
:I replaced my TPS (it had a bad spot), replaced both O2s with new (one had no reading, and I was tired of guessing if they were good), replaced PCV valves (for good measure), and replaced a very leaky accordion hose from a boost leak test. I have a couple of minor boost leaks left (carbon canister), but I doubt they are the whole story. I tested my fuel pressure per Ash's guide, and it was good.
:I'm now at 1200 miles into the rebuild, same issues.
:I just got this new compression tester: [ http://www.amazon.com/gp/product/B001QJ9JRY/ ] . Removed all spark plugs, left balance tube off, had throttle fully open. Have a charger on the battery, it should be fully charged.
:Results are (PSI) 1 - 89, 3- 91, 5 - 92, 2 - 80, 4 - 85, 6 -99 . Added oil to both 1 and 3 and pressure went up to 105.
:I'll take any of your questions, and welcome any thoughts. Some questions I have: What are the chances the new compression tester is bad? Does it have to be piston rings if the oil made the pressure go up? Is there ANY chance that 1 sprocket is 1 belt tooth off and the engine can still normally until under heavy load? Could that explain poor compression on both sides? I'm lost and going to be sick if my rebuild is trashed.
:What kind of break-in were you doing? Did it see any type of load?
|
 |
